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Penn State University
1.
Beveridge, Jacob Stanley.
Differential Magnetic Catch and Release: Separation, Purification, and Characterization of Magnetic Nanoparticles and Particles Assemblies.
Degree: 2012, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/14627 
► Magnetic nanoparticles uniquely combine superparamagnetic behavior with dimensions that are smaller than or the same size as molecular analytes. The integration of magnetic nanoparticles with…
(more)
▼ Magnetic nanoparticles uniquely combine superparamagnetic behavior with dimensions that are smaller than or the same size as molecular analytes. The integration of
magnetic nanoparticles with analytical methods has opened new avenues for sensing, purification, and quantitative analysis. Applied
magnetic fields can be used to control the motion and properties of
magnetic nanoparticles; in analytical chemistry, use of
magnetic fields provides methods for manipulating and analyzing species at the molecular level. The ability to use applied
magnetic fields to control the motion and properties of
magnetic nanoparticles is a tool for manipulating and analyzing species at the molecular level, and has led to applications including analyte handing, chemical sensors, and imaging techniques. This is clearly an area where significant growth and impact in separation science and analysis is expected in the future. In Chapter 1, we describe applications of
magnetic nanoparticles to analyte handling, chemical sensors, and imaging techniques.
Chapter 2 reports the purification and separation of
magnetic nanoparticle mixtures using the technique developed in our lab called differential
magnetic catch and release (DMCR). This method applies a variable
magnetic flux orthogonal to the flow direction in an open tubular capillary to trap and controllably release
magnetic nanoparticles.
Magnetic moments of 8, 12, and 17 nm diameter CoFe¬2¬O¬4 nanoparticles are calculated using the applied
magnetic flux density and experimentally determined force required to trap 50% of the particle sample. Balancing the relative strengths of the drag and
magnetic forces enable separation and purification of
magnetic CoFe2O4 nanoparticle samples with < 20 nm diameters. Samples were characterized by transmission electron microscopy to determine the average size and size dispersity of the sample population. DMCR is further demonstrated to be useful for separation of a
magnetic nanoparticle mixture, resulting in samples with narrowed size distributions.
Differential
magnetic catch and release has been used as a method for the purification and separation of
magnetic nanoparticles. In Chapter 3 the separation metrics are reported. DMCR separates nanoparticles in the mobile phase by
magnetic trapping of
magnetic nanoparticles against the wall of an open tubular capillary wrapped between two narrowly spaced electromagnetic poles. Using Au and CoFe2O4 nanoparticles as model systems, the loading capacity of the 250 m diameter capillary is determined to be ~130 g, and is scalable to higher quantities with larger bore capillary. Peak resolution in DMCR is externally controlled by selection of the release time (Rt) at which the
magnetic flux density is removed, however longer capture times are shown to reduce the capture yield. In addition, the
magnetic nanoparticle capture yields are observed to depend on the nanoparticle diameter, mobile phase viscosity and velocity, and applied
magnetic flux. Using these optimized parameters, three samples of CoFe2O4…
Advisors/Committee Members: Mary Beth Williams, Dissertation Advisor/Co-Advisor, Raymond Edward Schaak, Committee Member, Benjamin James Lear, Committee Member, Siyang Zheng, Committee Member.
Subjects/Keywords: Magnetic Nanoparticles; Differential Magnetic Catch and Release; Hybrid Nanocrystals; Nanoparticles
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APA (6th Edition):
Beveridge, J. S. (2012). Differential Magnetic Catch and Release: Separation, Purification, and Characterization of Magnetic Nanoparticles and Particles Assemblies. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/14627
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Beveridge, Jacob Stanley. “Differential Magnetic Catch and Release: Separation, Purification, and Characterization of Magnetic Nanoparticles and Particles Assemblies.” 2012. Thesis, Penn State University. Accessed January 18, 2021.
https://submit-etda.libraries.psu.edu/catalog/14627.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Beveridge, Jacob Stanley. “Differential Magnetic Catch and Release: Separation, Purification, and Characterization of Magnetic Nanoparticles and Particles Assemblies.” 2012. Web. 18 Jan 2021.
Vancouver:
Beveridge JS. Differential Magnetic Catch and Release: Separation, Purification, and Characterization of Magnetic Nanoparticles and Particles Assemblies. [Internet] [Thesis]. Penn State University; 2012. [cited 2021 Jan 18].
Available from: https://submit-etda.libraries.psu.edu/catalog/14627.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Beveridge JS. Differential Magnetic Catch and Release: Separation, Purification, and Characterization of Magnetic Nanoparticles and Particles Assemblies. [Thesis]. Penn State University; 2012. Available from: https://submit-etda.libraries.psu.edu/catalog/14627
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Pennsylvania
2.
Yun, Hongseok.
Synthesis and Characterization of Transition Metal Based Metal Oxide and Metallic Nanocrystals for Ac Magnetic Devices and Catalysis.
Degree: 2015, University of Pennsylvania
URL: https://repository.upenn.edu/edissertations/2120
► The d-block elements are very important in magnetics, electronics, catalysis, and biological systems. The synthesis and characterization of nearly monodisperse d-block element based nanocrystals with…
(more)
▼ The d-block elements are very important in magnetics, electronics, catalysis, and biological systems. The synthesis and characterization of nearly monodisperse d-block element based nanocrystals with a precise control over the size, composition, and shape are important to utilize the nanocrystals in such applications. The goals of my thesis are to synthesize d-block transition metal based nanocrystals and understand their magnetic and catalytic properties. I present the size- and composition-dependent AC magnetic permeability of superparamagnetic iron oxide nanocrystals for radio frequency applications. The nanocrystals are synthesized through high-temperature solvothermal decomposition, and their stoichiometry is determined by Mossbauer spectroscopy. Size-dependent magnetic permeability is observed in maghemite nanocrystals, while as-synthesized, magnetite-rich, iron oxide nanocrystals do not show size dependence due to the inhomogeneous crystal structure of the as-synthesized nanocrystals. The saturation magnetization of iron oxide nanocrystals is increased by doping of non-magnetic Zn2+ into A site of ferrite, resulting the enhancement of the real part of the magnetic permeability of Zn0.25Fe2.75O4 nanocrystals by twofold compared to that of similarly sized ferrite nanocrystals. The integration of 12.3 nm Zn0.25Fe2.75O4 nanocrystals into a microfabricated toroidal inductor and a solenoid inductor yield higher quality factors than air core inductors with the same geometries. The ligand exchange with dendrimers reduces the blocking temperature of Mn0.08Zn0.33Fe2.59O4 nanocrystal, indicating the decrease of dipolar coupling between nanocrystals. The study on MnxFe3-xO4 and CoxFe3-xO4 nanocrystals shows a clear difference in DC and AC magnetic behaviors of soft and hard magnetic nanocrystals. The inductor with zinc ferrite nanocrystal core is embedded into a power converter and its temperature dependent energy efficiency is measured. The energy efficiency of a power converter with the nanocrystal core inductor rises as the temperature increases while that of the power converters with an air core inductor or commercial core inductor decreases. Finally, I describe the hydrodeoxygenation reaction of 5-hydroxymethylfurfural into 2,5-dimethylfuran by metallic nanocrystals such as Pt, PtMn, PtFe, PtCo, and PtNi. Both conversion ratio and selectivity for 2,5-dimethylfuran show clear composition dependent catalytic properties and, in particular, 3.7 nm Pt3Co2 nanocrystals achieve 98 % of selectivity for 2,5-dimethylfuran.
Subjects/Keywords: bimetallic nanocrystals; ferrite; hydrodeoxygenation; magnetic permeability; nanocrystals; radio frequency; Chemistry; Mechanics of Materials
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APA (6th Edition):
Yun, H. (2015). Synthesis and Characterization of Transition Metal Based Metal Oxide and Metallic Nanocrystals for Ac Magnetic Devices and Catalysis. (Thesis). University of Pennsylvania. Retrieved from https://repository.upenn.edu/edissertations/2120
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Yun, Hongseok. “Synthesis and Characterization of Transition Metal Based Metal Oxide and Metallic Nanocrystals for Ac Magnetic Devices and Catalysis.” 2015. Thesis, University of Pennsylvania. Accessed January 18, 2021.
https://repository.upenn.edu/edissertations/2120.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Yun, Hongseok. “Synthesis and Characterization of Transition Metal Based Metal Oxide and Metallic Nanocrystals for Ac Magnetic Devices and Catalysis.” 2015. Web. 18 Jan 2021.
Vancouver:
Yun H. Synthesis and Characterization of Transition Metal Based Metal Oxide and Metallic Nanocrystals for Ac Magnetic Devices and Catalysis. [Internet] [Thesis]. University of Pennsylvania; 2015. [cited 2021 Jan 18].
Available from: https://repository.upenn.edu/edissertations/2120.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Yun H. Synthesis and Characterization of Transition Metal Based Metal Oxide and Metallic Nanocrystals for Ac Magnetic Devices and Catalysis. [Thesis]. University of Pennsylvania; 2015. Available from: https://repository.upenn.edu/edissertations/2120
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Indian Institute of Science
3.
Chalasani, Rajesh.
Functionalized Nanostructures : Iron Oxide Nanocrystals and Exfoliated Inorganic Nanosheets.
Degree: PhD, Faculty of Science, 2018, Indian Institute of Science
URL: http://etd.iisc.ac.in/handle/2005/3463
► This thesis consists of two parts. The first part deals with the magnetic properties of Fe3O4 nanocrystals and their possible application in water remediation. The…
(more)
▼ This thesis consists of two parts. The first part deals with the
magnetic properties of Fe3O4
nanocrystals and their possible application in water remediation. The second part is on the delamination of layered materials and the preparation of new layered hybrids from the delaminated sheets.
In recent years, nanoscale
magnetic particles have attracted considerable attention because of their potential applications in industry, medicine and environmental remediation. The most commonly studied
magnetic nanoparticles are metals, bimetals and metal oxides. Of these, magnetite, Fe3O4, nanoparticles have been the most intensively investigated as they are, non-toxic, stable and easy to synthesize.
Magnetic properties of nanoparticles such as the saturation magnetization, coercivity and blocking temperature are influenced both by size and shape. Below a critical size
magnetic particles can become single domain and above a critical temperature (T B , the blocking temperature) thermal fluctuations can induce random flipping of
magnetic moments resulting in loss of
magnetic order. At temperatures above the blocking temperature the particles are superparamagnetic.
Magnetic nanocrystals of similar dimensions but with different shapes show variation in
magnetic properties especially in the value of the blocking temperature, because of differences in the surface anisotropy contribution. The properties of
magnetic nanoparticles are briefly reviewed in Chapter 1. The objective of the present study was to synthesize Fe3O4
nanocrystals of different morphologies, to understand the difference in
magnetic properties associated with shape and to explore the possibility of using Fe3O4
nanocrystals in water remediation.
In the present study, oleate capped magnetite (Fe3O4)
nanocrystals of spherical and cubic morphologies of comparable dimensions (∼10nm) have been synthesized by thermal decomposition of FeOOH in high-boiling octadecene solvent (Chapter 2). The
nanocrystals were characterized by XRD, TEM and XPS spectroscopy. The nanoparticles of different morphologies exhibit very different blocking temperatures. Cubic
nanocrystals have a higher blocking temperature (T B = 190 K) as compared to spheres (T B = 142 K). From the shift in the hysteresis loop it is demonstrated that the higher blocking temperature is a consequence of exchange bias or exchange anisotropy that manifests when a ferromagnetic material is in physical contact with an antiferromagnetic material. In nanoparticles, the presence of an exchange bias field leads to higher blocking temperatures T B because of the
magnetic exchange coupling induced at the interface between the ferromagnet and antiferromagnet. It is shown that in these iron oxide
nanocrystals the exchange bias field originates from trace amounts of the antiferromagnet wustite, FeO, present along with the ferrimagnetic Fe3O4 phase. It is also shown that the higher FeO content in
nanocrystals of cubic morphology is responsible for the larger exchange bias fields that in turn lead to a higher blocking temperature.…
Advisors/Committee Members: Vasudevan, S (advisor).
Subjects/Keywords: Nanostructures; Iron Oxide Nanocrystals; Exfoliated Inorgnaic Nanosheets; Iron Oxide Nanocrystals; Magnetic Nanocrystals; Magnetic Nanoparticles; Magnetic Iron Oxide Nanocrystals; Magnetic Nanoparticles; Surfactant Intercalation; Layered Materials - Delamination; [email protected]; Inorganic Nanosheets; Layered Double Hydroxide; Oleate Capped Magnetite Nanocrystals; Nanotechnology
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APA (6th Edition):
Chalasani, R. (2018). Functionalized Nanostructures : Iron Oxide Nanocrystals and Exfoliated Inorganic Nanosheets. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3463
Chicago Manual of Style (16th Edition):
Chalasani, Rajesh. “Functionalized Nanostructures : Iron Oxide Nanocrystals and Exfoliated Inorganic Nanosheets.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed January 18, 2021.
http://etd.iisc.ac.in/handle/2005/3463.
MLA Handbook (7th Edition):
Chalasani, Rajesh. “Functionalized Nanostructures : Iron Oxide Nanocrystals and Exfoliated Inorganic Nanosheets.” 2018. Web. 18 Jan 2021.
Vancouver:
Chalasani R. Functionalized Nanostructures : Iron Oxide Nanocrystals and Exfoliated Inorganic Nanosheets. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Jan 18].
Available from: http://etd.iisc.ac.in/handle/2005/3463.
Council of Science Editors:
Chalasani R. Functionalized Nanostructures : Iron Oxide Nanocrystals and Exfoliated Inorganic Nanosheets. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3463
Vanderbilt University
4.
He, Weidong.
Synthesis and characterizations of europium chalcogenide and tellurium nanocrystals.
Degree: MS, Interdisciplinary Materials Science, 2011, Vanderbilt University
URL: http://hdl.handle.net/1803/10701
► Facile one-step syntheses of colloidal EuS, EuTe and Te nanocrystals are presented in this thesis. The formation of single crystalline monodisperse nanocrystals, with sizes finely…
(more)
▼ Facile one-step syntheses of colloidal EuS, EuTe and Te
nanocrystals are presented in this thesis. The formation of single crystalline monodisperse
nanocrystals, with sizes finely controlled by synthetic conditions, was confirmed by x-ray diffraction and high resolution transmission electron microscopy analysis. The exciton transition of EuS and EuTe
nanocrystals blue-shifts to higher energies with decreasing particle sizes, as revealed by optical absorption and photoluminescence measurements. The feasibility of synthesizing monocrystalline EuS nanorods and EuTe nanospindles was also demonstrated, making them potentially viable materials for device applications. Low-temperature
magnetic measurements show that as-synthesized EuTe nanoparticles show pronounced superantiferromagnetic transition between. Te
nanocrystals were well separated into two size regimes and assembled into films by eletrophoretic deposition.
Advisors/Committee Members: Timothy P. Hanusa (committee member), Jason Gage Valentine (committee member), Kalman Varga (committee member), James Henry Dickerson (Committee Chair).
Subjects/Keywords: optical and magnetic properties; europium chalcogenides; nanocrystals; electrophoresis; colloidal synthesis
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APA (6th Edition):
He, W. (2011). Synthesis and characterizations of europium chalcogenide and tellurium nanocrystals. (Thesis). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/10701
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
He, Weidong. “Synthesis and characterizations of europium chalcogenide and tellurium nanocrystals.” 2011. Thesis, Vanderbilt University. Accessed January 18, 2021.
http://hdl.handle.net/1803/10701.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
He, Weidong. “Synthesis and characterizations of europium chalcogenide and tellurium nanocrystals.” 2011. Web. 18 Jan 2021.
Vancouver:
He W. Synthesis and characterizations of europium chalcogenide and tellurium nanocrystals. [Internet] [Thesis]. Vanderbilt University; 2011. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/1803/10701.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
He W. Synthesis and characterizations of europium chalcogenide and tellurium nanocrystals. [Thesis]. Vanderbilt University; 2011. Available from: http://hdl.handle.net/1803/10701
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
5.
Siebers, Benjamin.
Spectroscopy of excitons in CdSe/CdS colloidal nanocrystals.
Degree: 2015, Technische Universität Dortmund
URL: http://dx.doi.org/10.17877/DE290R-7297
► Since their discovery in the 1980s, colloidal semiconductor nanocrystals have been intensely studied theoretically and experimentally because of their great potential for a wide range…
(more)
▼ Since their discovery in the 1980s, colloidal semiconductor
nanocrystals have been intensely studied theoretically and experimentally because of their great potential for a wide range of applications in, for example, optoelectronics, spintronics or biolabeling. One of the main obstacles with respect to such applications is the improvement of the radiative properties, i.e. the quantum yield, of
nanocrystals, which exhibit strong non-radiative channels, such as Auger scattering. In CdSe
nanocrystals, the radiative recombination of excitons is strongly affected by the construction of the exciton fine structure, which consists of states with dipole allowed and forbidden transitions. Notably, in perfectly spherical
nanocrystals the exciton ground state is optically forbidden in the electric dipole approximation, implying a long radiative lifetime, which favors non-radiative recombination and thereby degrades the optical properties of such
nanocrystals.
This thesis elucidates how the exciton fine structure and exciton dynamics can be affected by tailoring the nanocrystal size and shape. It is shown, that the introduction of a shell of different bandgap material from the core greatly extends the possibilities in this regard, since it gives the ability to control the electron-hole wavefunction overlap, which determines radiative recombination and the construction of the exciton fine structure. Furthermore, exciton spin dynamics in external
magnetic fields and the polarization properties of the photoluminescence were studied by time- and polarization-resolved photoluminescence spectroscopy. It is shown, that the spin relaxation rate is strongly dependent on the core size in core/shell
nanocrystals, whereas it is weakly dependent on the size and shape of the shell. A theoretical model for describing the circular polarization of
nanocrystals with anisotropic shell shapes in external
magnetic fields is elaborated. Finally, the mechanisms,
which enable radiative recombination of excitons with forbidden optical transitions, are studied by fluorescence line narrowing. The experimental results support a recent theory, which predicts the activation of radiative recombination of those excitons by surface dangling bonds.
Advisors/Committee Members: Yakovlev, Dmitri R. (advisor), Hövel, Heinz (referee).
Subjects/Keywords: Nanocrystals; Spectroscopy; Excitons; Magnetic field; CdSe; 530; Cadmiumselenid; Nanokristall; Photolumineszenz; Exziton
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APA (6th Edition):
Siebers, B. (2015). Spectroscopy of excitons in CdSe/CdS colloidal nanocrystals. (Doctoral Dissertation). Technische Universität Dortmund. Retrieved from http://dx.doi.org/10.17877/DE290R-7297
Chicago Manual of Style (16th Edition):
Siebers, Benjamin. “Spectroscopy of excitons in CdSe/CdS colloidal nanocrystals.” 2015. Doctoral Dissertation, Technische Universität Dortmund. Accessed January 18, 2021.
http://dx.doi.org/10.17877/DE290R-7297.
MLA Handbook (7th Edition):
Siebers, Benjamin. “Spectroscopy of excitons in CdSe/CdS colloidal nanocrystals.” 2015. Web. 18 Jan 2021.
Vancouver:
Siebers B. Spectroscopy of excitons in CdSe/CdS colloidal nanocrystals. [Internet] [Doctoral dissertation]. Technische Universität Dortmund; 2015. [cited 2021 Jan 18].
Available from: http://dx.doi.org/10.17877/DE290R-7297.
Council of Science Editors:
Siebers B. Spectroscopy of excitons in CdSe/CdS colloidal nanocrystals. [Doctoral Dissertation]. Technische Universität Dortmund; 2015. Available from: http://dx.doi.org/10.17877/DE290R-7297
Rice University
6.
Young, Joseph.
Complexed Multifunctional Metallic and Chalcogenide Nanostructures as Theranostic Agents.
Degree: PhD, Engineering, 2013, Rice University
URL: http://hdl.handle.net/1911/77592
► Nanostructures have attracted substantial attention due to their distinctive properties and various applications. Nanostructures consisting of multiple morphologies and/or materials have recently become the focus…
(more)
▼ Nanostructures have attracted substantial attention due to their distinctive properties and various applications. Nanostructures consisting of multiple morphologies and/or materials have recently become the focus of intense study with particular attention being paid to their optical and
magnetic properties and the enhanced role of the interface between materials. Of particular interest are metallic-based plasmonic nanostructures, structures that support surface plasmon resonances that are sensitive to the environment, and ferrimagnetic-based nanostructures, structures that exhibit strong
magnetic properties when exposed to an external field. These nanostructures provide theranostic potential in the context of cancer photothermal therapies, diagnostics and imaging. Additionally, chalcogenide based nanostructure complexes are particularly interesting. Metallic chalcogenides offer the ability to combine different types of linear and nonlinear optical properties, enable design of nanostructure complexes with surface plasmon resonance effects in new wavelength ranges, and act as photo-emitting agents for novel theranostic applications.
In this thesis an in depth analysis of plasmonic,
magnetic and photo-emitting nanostructures as theranostic agents is presented. We have created several multifunctional nanostructures and the factors contributing to the functional properties of these nanostructures are explored systematically through experimentation, theory, and simulations. Both in vivo and in vitro testing demonstrates the applicability of these nanostructures as theranostic agents.
Advisors/Committee Members: Drezek, Rebekah A. (advisor), Hicks, Illya V. (committee member), Kono, Junichiro (committee member).
Subjects/Keywords: Theranostics; Nanoparticles; Photothermal; Chalcogenide; Nanocrystals; Nanoshells; Magnetic resonance imaging (MRI)
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APA (6th Edition):
Young, J. (2013). Complexed Multifunctional Metallic and Chalcogenide Nanostructures as Theranostic Agents. (Doctoral Dissertation). Rice University. Retrieved from http://hdl.handle.net/1911/77592
Chicago Manual of Style (16th Edition):
Young, Joseph. “Complexed Multifunctional Metallic and Chalcogenide Nanostructures as Theranostic Agents.” 2013. Doctoral Dissertation, Rice University. Accessed January 18, 2021.
http://hdl.handle.net/1911/77592.
MLA Handbook (7th Edition):
Young, Joseph. “Complexed Multifunctional Metallic and Chalcogenide Nanostructures as Theranostic Agents.” 2013. Web. 18 Jan 2021.
Vancouver:
Young J. Complexed Multifunctional Metallic and Chalcogenide Nanostructures as Theranostic Agents. [Internet] [Doctoral dissertation]. Rice University; 2013. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/1911/77592.
Council of Science Editors:
Young J. Complexed Multifunctional Metallic and Chalcogenide Nanostructures as Theranostic Agents. [Doctoral Dissertation]. Rice University; 2013. Available from: http://hdl.handle.net/1911/77592
Virginia Tech
7.
Tracy, Nicholas Alan.
Synthesis and Characterization of Magnetic II-VI Nanoparticles.
Degree: MS, Electrical and Computer Engineering, 2006, Virginia Tech
URL: http://hdl.handle.net/10919/32507
► Magnetic semiconductor nanocrystals are being studied for their potential application in the field of spintronics as spin-injectors for spin-based transistors and spin-based storage elements for…
(more)
▼ Magnetic semiconductor
nanocrystals are being studied for their potential application in the field of spintronics as spin-injectors for spin-based transistors and spin-based storage elements for nonvolatile memories. They also have a number of biomedical engineering applications including contrast enhancing agents for
magnetic resonance imaging (MRI). In this study, we present a synthesis route to grow colloidal II-VI
magnetic nanoparticles at room temperature with easily handled, relatively non-toxic source materials. CoSe and CrSe
nanocrystals were synthesized in an aqueous solution where gelatin is used to retard the reaction. Characterization of the
nanocrystals was done through transmission electron microscope (TEM) imaging and UV-Vis absorption spectroscopy. Spin-carrier relaxation times were determined using a superconducting quantum interference device (SQUID) magnetometer.
Advisors/Committee Members: Meehan, Kathleen (committeechair), Hendricks, Robert W. (committee member), Wyatt, Christopher L. (committee member).
Subjects/Keywords: biomedical; MRI; nanoparticles; nanocrystals; magnetic
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APA (6th Edition):
Tracy, N. A. (2006). Synthesis and Characterization of Magnetic II-VI Nanoparticles. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/32507
Chicago Manual of Style (16th Edition):
Tracy, Nicholas Alan. “Synthesis and Characterization of Magnetic II-VI Nanoparticles.” 2006. Masters Thesis, Virginia Tech. Accessed January 18, 2021.
http://hdl.handle.net/10919/32507.
MLA Handbook (7th Edition):
Tracy, Nicholas Alan. “Synthesis and Characterization of Magnetic II-VI Nanoparticles.” 2006. Web. 18 Jan 2021.
Vancouver:
Tracy NA. Synthesis and Characterization of Magnetic II-VI Nanoparticles. [Internet] [Masters thesis]. Virginia Tech; 2006. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/10919/32507.
Council of Science Editors:
Tracy NA. Synthesis and Characterization of Magnetic II-VI Nanoparticles. [Masters Thesis]. Virginia Tech; 2006. Available from: http://hdl.handle.net/10919/32507
Univerzitet u Beogradu
8.
Stojanović, Zoran S., 1978-.
Proučavanje procesa sinteze i svojstava višefaznih
oksidnih prahova dobijenih hidrotermalnim procesiranjem.
Degree: Tehnološko-metalurški fakultet, 2016, Univerzitet u Beogradu
URL: https://fedorabg.bg.ac.rs/fedora/get/o:12320/bdef:Content/get
► Tehničko–tehnološke nauke-Nauka i inženjerstvo materijala/Applied sciences-Materials science and engineering
Doktorska disertacija obuhvata istraţivanja fundamentalnih aspekata i strategija sinteze koloidnih nanokristala, nanostruktura i submikronskih kristala nekoliko…
(more)
▼ Tehničko–tehnološke nauke-Nauka i inženjerstvo
materijala/Applied sciences-Materials science and
engineering
Doktorska disertacija obuhvata istraţivanja
fundamentalnih aspekata i strategija sinteze koloidnih
nanokristala, nanostruktura i submikronskih kristala nekoliko
neorganskih oksidnih materijala i zlata, hidrotermalnim i
solvotermalnim procesima. Motivacija za istraţivanja je opšti
nauĉni interes za poznavanjem mehanizama sinteze koloidnih
nanokristala i rasta kristala u hidrotermalnim i solvotermalnim
uslovima u cilju uspostavljanja metoda kontrolisane sinteze
homogenih i heterogenih funkcionalnih nanostruktura. Dalja
istraţivanja su voĊena u dva pravca, formiranje razliĉitih
struktura višeg reda supramolekulskim interakcijama i potencijalna
implementacija sintetisanih materijala u praksi. Materijal koji je
po obimu najviše bio zastupljen u istraţivanjima koja su obuhvaćena
doktorskom disertacijom je kalcijum hidroksiapatit (HAp) i njegovi
parcijalno supstituisani derivati sa jonima Co2+ (CoHAp) i
Zr4+/ZrO2 (ZrHAp). Ispitana je sinteza HAp, CoHAp i ZrHAp u
hidrotermalnom sistemu bez prisustva organskih supstanci. UraĊena
je detaljna karakterizacija uzoraka metodama kao što su rendgenska
difrakcija na prahu (XRD), laserska difrakcija (LD), atomska
spektroskopija (ICP AS) i skanirajuća elektronska mikroskopija
(SEM). U nastavku istraţivanja, ekstenzivno su ispitani HAp i CoHAp
sa razliĉitim udelima supstituisanog kobalta u strukturi u in vitro
i in vivo biološkim uslovima kao funkcionalnog materijala za
reparaciju oštećenog koštanog tkiva mandibule pacova. Dobijeni
rezultati pokazuju da sinergistiĉki efekti u biološkim sistemima
prilikom implantacije CoHAp materijala, omogućavaju iznenaĊujuće
brzu regeneraciju i povećanje gustine koštanog
tkiva...
Advisors/Committee Members: Aleksić, Radoslav, 1952-.
Subjects/Keywords: hydrothermal synthesis; solvothermal synthesis;
nanocrystals; morphology; oxides; magnetic materials; apatite;
phosphates; gold; colloidal heterostructures
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APA (6th Edition):
Stojanović, Zoran S., 1. (2016). Proučavanje procesa sinteze i svojstava višefaznih
oksidnih prahova dobijenih hidrotermalnim procesiranjem. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:12320/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Stojanović, Zoran S., 1978-. “Proučavanje procesa sinteze i svojstava višefaznih
oksidnih prahova dobijenih hidrotermalnim procesiranjem.” 2016. Thesis, Univerzitet u Beogradu. Accessed January 18, 2021.
https://fedorabg.bg.ac.rs/fedora/get/o:12320/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Stojanović, Zoran S., 1978-. “Proučavanje procesa sinteze i svojstava višefaznih
oksidnih prahova dobijenih hidrotermalnim procesiranjem.” 2016. Web. 18 Jan 2021.
Vancouver:
Stojanović, Zoran S. 1. Proučavanje procesa sinteze i svojstava višefaznih
oksidnih prahova dobijenih hidrotermalnim procesiranjem. [Internet] [Thesis]. Univerzitet u Beogradu; 2016. [cited 2021 Jan 18].
Available from: https://fedorabg.bg.ac.rs/fedora/get/o:12320/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Stojanović, Zoran S. 1. Proučavanje procesa sinteze i svojstava višefaznih
oksidnih prahova dobijenih hidrotermalnim procesiranjem. [Thesis]. Univerzitet u Beogradu; 2016. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:12320/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Washington
9.
Barrows, Charles J.
Helping Observe and Tune Diffusion Using Mn2+ Photophysics in Inorganic Nanocrystals after Growth.
Degree: PhD, 2017, University of Washington
URL: http://hdl.handle.net/1773/38597
► Doped inorganic crystals exhibit attractive optical, electrical, and magnetic properties that enabled the development of important modern technologies including ruby lasers and silicon microelectronics. The…
(more)
▼ Doped inorganic crystals exhibit attractive optical, electrical, and
magnetic properties that enabled the development of important modern technologies including ruby lasers and silicon microelectronics. The next frontier of doping chemistry is taking place on the nanoscale, where quantum confinement effects dramatically change the photophysical properties of semiconductors. This thesis describes recent advances in the doping of colloidal II–VI semiconductor
nanocrystals known as “quantum dots.” Interactions between excitonic excited states and Mn2+, a model
magnetic dopant, are investigated, primarily by
magnetic circular dichroism (MCD) spectroscopy. These data reveal a new mechanism of nanocrystal doping characterized by thermodynamic addition of cation + anion pairs, followed by diffusional mixing. A broad range of equilibrium compositions are achieved, from less than one to hundreds of impurities per quantum dot, and subsequent cation exchange reactions are utilized to develop a model for dopant diffusion in these
nanocrystals. Unique spectroscopic signatures are demonstrated, including nonmonotonic magnetization in the low-doping regime and extraordinarily large (whopping) Zeeman splittings in more highly doped quantum dots. Collectively, these studies provide insight into the fundamental processes of diffusion and
magnetic exchange on the nanoscale, and may be useful for future spintronics, spin-photonics, and solar energy conversion technologies.
Advisors/Committee Members: Gamelin, Daniel R (advisor).
Subjects/Keywords: Colloidal doped quantum dots; Diluted magnetic semiconductor nanocrystals; Excitonic Zeeman splittings; Magnetic circular dichroism; Chemistry; Inorganic chemistry; Physical chemistry; Chemistry
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APA (6th Edition):
Barrows, C. J. (2017). Helping Observe and Tune Diffusion Using Mn2+ Photophysics in Inorganic Nanocrystals after Growth. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/38597
Chicago Manual of Style (16th Edition):
Barrows, Charles J. “Helping Observe and Tune Diffusion Using Mn2+ Photophysics in Inorganic Nanocrystals after Growth.” 2017. Doctoral Dissertation, University of Washington. Accessed January 18, 2021.
http://hdl.handle.net/1773/38597.
MLA Handbook (7th Edition):
Barrows, Charles J. “Helping Observe and Tune Diffusion Using Mn2+ Photophysics in Inorganic Nanocrystals after Growth.” 2017. Web. 18 Jan 2021.
Vancouver:
Barrows CJ. Helping Observe and Tune Diffusion Using Mn2+ Photophysics in Inorganic Nanocrystals after Growth. [Internet] [Doctoral dissertation]. University of Washington; 2017. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/1773/38597.
Council of Science Editors:
Barrows CJ. Helping Observe and Tune Diffusion Using Mn2+ Photophysics in Inorganic Nanocrystals after Growth. [Doctoral Dissertation]. University of Washington; 2017. Available from: http://hdl.handle.net/1773/38597
Rice University
10.
Mayo, John Thomas.
The synthesis, characterization and application of iron oxide nanocrystals in magnetic separations for arsenic and uranium removal.
Degree: PhD, Natural Sciences, 2012, Rice University
URL: http://hdl.handle.net/1911/70343
► Arsenic and uranium in the environment are hazardous to human health and require better methods for detection and remediation. Nanocrystalline iron oxides offer a number…
(more)
▼ Arsenic and uranium in the environment are hazardous to human health and require better methods for detection and remediation. Nanocrystalline iron oxides offer a number of advantages as sorbents for water purification and environmental remediation. First, highly uniform and crystalline iron oxide
nanocrystals (nMAG) were prepared using thermal decomposition of iron salts in organic solutions; for the applications of interest in this thesis, a central challenge was the adaptation of these conventional synthetic methods to the needs of low infrastructure and economically disadvantaged settings. We show here that it is possible to form highly uniform and magnetically responsive nanomaterials using starting reagents and equipment that are readily available and economical. The products of this approach, termed the 'Kitchen Synthesis', are of comparable quality and effectiveness to laboratory materials. The narrow size distributions of the iron oxides produced in the laboratory synthesis made it possible to study the size-dependence of the
magnetic separation efficiency of
nanocrystals; generally as the diameter of particles increased they could be removed under lower applied
magnetic fields. In this work we take advantage of this size-dependence to use
magnetic separation as a tool to separate broadly distributed populations of
magnetic materials. Such work makes it possible to use these materials in multiplexed separation and sensing schemes. With the synthesis and
magnetic separation studies of these materials completed, it was possible to optimize their applications in water purification and environmental remediation. These materials removed both uranium and arsenic from contaminated samples, and had remarkably high sorption capacities – up to 12 wt% for arsenic and 30 wt% for uranium. The contaminated nMAG is removed from the drinking water by either retention in a sand column, filter, or by
magnetic separation. The uranium adsorption process was also utilized for the enhanced detection of uranium in environmental matrices. By relying on α-particle detection in well-formed and dense nMAG films, it was possible to improve soil detection of uranium by more than ten-thousand-fold. Central for this work was a detailed understanding of the chemistry at the iron oxide interface, and the role of the organic coatings in mediating the sorption process.
Advisors/Committee Members: Colvin, Vicki L. (advisor).
Subjects/Keywords: Applied sciences; Pure sciences; Iron oxide; Nanocrystals; Magnetic separations; Arsenic; Uranium; Inorganic chemistry; Nanoscience; Environmental engineering
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APA (6th Edition):
Mayo, J. T. (2012). The synthesis, characterization and application of iron oxide nanocrystals in magnetic separations for arsenic and uranium removal. (Doctoral Dissertation). Rice University. Retrieved from http://hdl.handle.net/1911/70343
Chicago Manual of Style (16th Edition):
Mayo, John Thomas. “The synthesis, characterization and application of iron oxide nanocrystals in magnetic separations for arsenic and uranium removal.” 2012. Doctoral Dissertation, Rice University. Accessed January 18, 2021.
http://hdl.handle.net/1911/70343.
MLA Handbook (7th Edition):
Mayo, John Thomas. “The synthesis, characterization and application of iron oxide nanocrystals in magnetic separations for arsenic and uranium removal.” 2012. Web. 18 Jan 2021.
Vancouver:
Mayo JT. The synthesis, characterization and application of iron oxide nanocrystals in magnetic separations for arsenic and uranium removal. [Internet] [Doctoral dissertation]. Rice University; 2012. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/1911/70343.
Council of Science Editors:
Mayo JT. The synthesis, characterization and application of iron oxide nanocrystals in magnetic separations for arsenic and uranium removal. [Doctoral Dissertation]. Rice University; 2012. Available from: http://hdl.handle.net/1911/70343
Indian Institute of Science
11.
Mukherjee, Sumanta.
Internal Structure and Self-Assembly of Low Dimensional Materials.
Degree: PhD, Faculty of Science, 2018, Indian Institute of Science
URL: http://etd.iisc.ac.in/handle/2005/3474
► The properties of bulk 3D materials of metals or semiconductors are manifested with various length scales(e.g., Bohr excitonic radius, magnetic correlation length, mean free path…
(more)
▼ The properties of bulk 3D materials of metals or semiconductors are manifested with various length scales(e.g., Bohr excitonic radius,
magnetic correlation length, mean free path etc.) and are important in controlling their properties. When the size of the material is smaller than these characteristics length scales, the confinement effects operate reflecting changes in their physical behavior. Materials with such confinement effects can be designated as low dimensional materials. There are exceedingly large numbers of low dimensional materials and the last half a century has probably seen the maximum evolution of such materials in terms of synthesis, characterization, understanding and modification of their properties and applications. The field of” nanoscience and nanotechnology”, have become a mature field within the last three decades where, for certain application, synthesis of materials of sizes in the nanometer range can be designed and controlled.
Interface plays a very important role in controlling properties of heterogeneous material of every dimensionality. For example, the interface forms in 2D thin films or interface of heterogeneous nanoparticles(0D). In recent times, a large number of remarkable phenomena have triggered understanding and controlling properties arises due to nature of certain interface. In the field of nanoparticles, it is well known that the photoluminescence property depends very strongly on the nature of interface in heterostructured nanoparticles. In the recent time a large variety of heterostructured nanoparticles starting from core-shell to quantum dot-quantum well kind has been synthesized to increase the photoluminescence efficiency up to 80%. Along with improvement of certain properties due to heterostructure formation inside the nanoparticles, the techniques to understand the nature of those interfaces have improved side by side. It has been recently shown that variable energy X-ray Photoemission Spectroscopy (XPS) can be employed to understand the nature of interfaces (internal structure) of such heterostructure nanoparticles in great detail with high accuracy. While most of the previous studies of variable energy XPS, uses photonenergies sensitive to smaller sized particle, we have extended the idea of such nondestructive approach of understanding the nature of buried interfaces to bigger sized nanoparticles by using photon energy as high as 8000eV, easily available in various 3rd generation synchrotron centers.
The nature of the interface also plays an important role in multilayer thin films. Major components of various electronic devices, like read head memory devices, field effect transistors etc., rely on interface properties of certain multilayer thin film materials. In recent time wide range of unusual phenomenon such as high mobility metallic behavior between two insulating oxide, superconductivity, interface ferroelectricity, unusual magnetism, multiferroicity etc. has been observed at oxide interface making it an interesting field of study. We have shown that…
Advisors/Committee Members: Sarma, D D (advisor).
Subjects/Keywords: Nanomaterials; Nanocrystals; Thin Films; Low Dimensional Materials; Surface Chemistry; Complex Nanocrystals; Giant Nanocrystals; CoFeB/MgO Magnetic Tunnel Junctions; Nanoparticles; X-Ray Photoemission Spectroscopy; LaAlO3-SrTiO3 Oxide Heterojunction; Colloidal Self-assembly; Nanotechnology
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APA (6th Edition):
Mukherjee, S. (2018). Internal Structure and Self-Assembly of Low Dimensional Materials. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3474
Chicago Manual of Style (16th Edition):
Mukherjee, Sumanta. “Internal Structure and Self-Assembly of Low Dimensional Materials.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed January 18, 2021.
http://etd.iisc.ac.in/handle/2005/3474.
MLA Handbook (7th Edition):
Mukherjee, Sumanta. “Internal Structure and Self-Assembly of Low Dimensional Materials.” 2018. Web. 18 Jan 2021.
Vancouver:
Mukherjee S. Internal Structure and Self-Assembly of Low Dimensional Materials. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Jan 18].
Available from: http://etd.iisc.ac.in/handle/2005/3474.
Council of Science Editors:
Mukherjee S. Internal Structure and Self-Assembly of Low Dimensional Materials. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3474
University of Texas – Austin
12.
Heitsch, Andrew Theron.
Synthesis and characterization of silicon nanowires, silicon nanorods, and magnetic nanocrystals.
Degree: PhD, Chemical Engineering, 2010, University of Texas – Austin
URL: http://hdl.handle.net/2152/ETD-UT-2010-05-882
► Silicon nanowires, silicon nanorods, and magnetic nanocrystals have shown interesting size, shape, mechanical, electronic, and/or magnetic properties and many have proposed their use in exciting…
(more)
▼ Silicon nanowires, silicon nanorods, and
magnetic nanocrystals have shown interesting size, shape, mechanical, electronic, and/or
magnetic properties and many have proposed their use in exciting applications. However, before these materials can be applied, it is critical to fully understand their properties and how to synthesize them economically and reproducibly. Silicon nanowires were synthesized in high boiling point ambient pressure solvents using gold and bismuth
nanocrystals seeds and trisilane as the silicon precursor. Reactions temperatures as low as 410°C were used to promote the solution-liquid-solid (SLS) growth of silicon nanowires. The silicon nanowires synthesis was optimized to produce 5 mg of silicon nanowires with average diameters of 30 nm and lengths exceeding 2 [mu]m by adjusting the silicon to gold ratio in the injection mixture and reaction temperature. Silicon nanorods were synthesized using a solution-based arrested-SLS growth approach where gold seeds, trisilane, and a dodecylamine were vital to the success. Dodecylamine was found to prevent gold seed coalescence at high temperatures – creating small diameter rods – and bond to the crystalline silicon surface – preventing silicon nanorod aggregation. Furthermore, an etching strategy was developed using an emulsion of aqua regia and chloroform to remove the gold seeds from the silicon nanorods tip. A thin silicon shell surrounding the gold seed of the silicon nanorod was subsequently observed. Multifunctional colloidal core-shell nanoparticles of iron platinum or iron oxide encapsulated in fluorescent dye doped silica shells were also synthesized. The as-prepared
magnetic nanocrystals are initially hydrophobic and were coated with a uniform silica shell using a microemulsion approach. These colloidal heterostructures have the potential to be used as dual-purpose tags, exhibiting a fluorescent signal that could be combined with enhanced
magnetic resonance imaging contrast. Compositionally-ordered, single domain, antiferromagnetic L1₂ FePt₃ and ferromagnetic L1₀ FePt
nanocrystals were synthesized by coating colloidally-grown Pt-rich or stoichiometricly equal Fe-Pt
nanocrystals with thermally-stable SiO₂ and annealing at high temperature. Without the silica coating, the
nanocrystals transform predominately into the L1₀ FePt phase due to interparticle diffusion of Fe and Pt atoms. Magnetization measurements of the L1₂ FePt₃
nanocrystals revealed two antiferromagnetic transitions near the bulk Neél temperatures of 100K and 160K. Combining L1₂ FePt₃
nanocrystals with L1₀ FePt
nanocrystals was found to produce a constriction in field-dependent magnetization loops that has previously been observed near zero applied field in ensemble measurements of single domain silica-coated L1₀ FePt
nanocrystals. Dipole interactions between
[email protected]₂ nanoparticles with varying SiO₂ shell thickness was also explored.
Advisors/Committee Members: Korgel, Brian Allan, 1969- (advisor), Barbara, Paul F. (committee member), Ekerdt, John G. (committee member), Hwang, Gyeong S. (committee member), Mullins, C. B. (committee member).
Subjects/Keywords: Silicon nanowires; Silicon nanorods; Iron platinum nanocrystals; SLS growth; Dodecylamine; Magnetic nanocrystals; Gold seeds; Trisilane; Nanocrystals; Nanowires; Nanorods
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APA (6th Edition):
Heitsch, A. T. (2010). Synthesis and characterization of silicon nanowires, silicon nanorods, and magnetic nanocrystals. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2010-05-882
Chicago Manual of Style (16th Edition):
Heitsch, Andrew Theron. “Synthesis and characterization of silicon nanowires, silicon nanorods, and magnetic nanocrystals.” 2010. Doctoral Dissertation, University of Texas – Austin. Accessed January 18, 2021.
http://hdl.handle.net/2152/ETD-UT-2010-05-882.
MLA Handbook (7th Edition):
Heitsch, Andrew Theron. “Synthesis and characterization of silicon nanowires, silicon nanorods, and magnetic nanocrystals.” 2010. Web. 18 Jan 2021.
Vancouver:
Heitsch AT. Synthesis and characterization of silicon nanowires, silicon nanorods, and magnetic nanocrystals. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2010. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/2152/ETD-UT-2010-05-882.
Council of Science Editors:
Heitsch AT. Synthesis and characterization of silicon nanowires, silicon nanorods, and magnetic nanocrystals. [Doctoral Dissertation]. University of Texas – Austin; 2010. Available from: http://hdl.handle.net/2152/ETD-UT-2010-05-882
Georgia Tech
13.
Song, Qing.
Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals.
Degree: PhD, Chemistry and Biochemistry, 2005, Georgia Tech
URL: http://hdl.handle.net/1853/7645
► Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals Qing Song 216 pages Directed by Dr. Z. John Zhang The correlationship between…
(more)
▼ Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites
Nanocrystals
Qing Song
216 pages
Directed by Dr. Z. John Zhang
The correlationship between
magnetic properties and
magnetic couplings is established through the investigations of various cubic spinel ferrite
nanocrystals. The results of this thesis contribute to the knowledge of size and shape controlled synthesis of various spinel ferrites and core shell architectured
nanocrystals as well as the nanomagnetism in spinel ferrites by systematically investigating the effects of spin orbital coupling, magnetocrystalline anisotropy, exchange coupling, shape and surface anisotropy upon superparamagnetic properties of spinel ferrite
nanocrystals. A general synthetic method is developed for size and shape control of metal oxide
nanocrystals. The size and shape dependent superparamagnetic properties are discussed. The relationship between spin orbital coupling and magnetocrystalline anisotropy is studied comparatively on variable sizes of spherical CoFe2O4 and Fe3O4
nanocrystals. It also addresses the effect of exchange coupling between
magnetic hard phase and soft phase upon
magnetic properties in core shell structured spinel ferrite
nanocrystals. The role of anisotropic shapes of
nanocrystals upon self assembled orientation ordered superstructures are investigated. The effect of thermal stability of molecular precursors upon size controlled synthesis of MnFe2O4
nanocrystals and the size dependent superparamagnetic properties are described.
Advisors/Committee Members: Zhang, John (Committee Chair), Barefield, Kent (Committee Member), El-Sayed, Mostafa (Committee Member), Wang, ZhongLin (Committee Member), Wilkinson, Angus (Committee Member).
Subjects/Keywords: Spinel ferrite; Superparamagnetism; Synthesis; Nanocrystals; Size and shape control; Superlattices; Superstructures; Nanoparticles Magnetic properties; Spinel group Magnetic properties; Ferrites (Magnetic materials); Ferromagnetism; Nanocrystals
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APA (6th Edition):
Song, Q. (2005). Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/7645
Chicago Manual of Style (16th Edition):
Song, Qing. “Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals.” 2005. Doctoral Dissertation, Georgia Tech. Accessed January 18, 2021.
http://hdl.handle.net/1853/7645.
MLA Handbook (7th Edition):
Song, Qing. “Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals.” 2005. Web. 18 Jan 2021.
Vancouver:
Song Q. Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals. [Internet] [Doctoral dissertation]. Georgia Tech; 2005. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/1853/7645.
Council of Science Editors:
Song Q. Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals. [Doctoral Dissertation]. Georgia Tech; 2005. Available from: http://hdl.handle.net/1853/7645
14.
Maiti, Sourav.
Effect of Surface Environment on Energy Relaxation Dynamics in Photo-Excited Nanocrystals.
Degree: MS, Chemistry, 2013, Texas A&M University
URL: http://hdl.handle.net/1969.1/151636
► The optical properties of semiconducting nanocrystals have considerable application in various fields such as biological imaging, light emitting devices and solar cells. Due to high…
(more)
▼ The optical properties of semiconducting
nanocrystals have considerable application in various fields such as biological imaging, light emitting devices and solar cells. Due to high surface to volume ratio surface structure has a profound effect on the exciton quantum yield and charge carrier dynamics of these
nanocrystals. Surface imperfections or surface defects often decrease the exciton quantum yield by trapping the charge carriers and thus affect relaxation dynamics. Surface binding surfactants play an important role in determining optical properties and exciton dynamics as they can remove surface defects through passivation and they can also introduce new trap sites.
Transition metal doped semiconducting
nanocrystals especially Mn-doped in II-VI semiconducting host show stoke shifted Mn-emission with high Mn-emission quantum yield applicable in light emitting devices, biological imaging and sensors. Although Mn-emission was found to depend on surface effects, the underlying mechanism and dynamics was not explored in great detail. Thiols are important class of surfactants used to passivate
nanocrystals especially to make water soluble
nanocrystals. Thiols are hole trapping surfactants and known to quench the emission in CdSe or CdS nanocrytals. In our study, we examined the effect of hole trapping ligand octanethiol on the Mn-luminescence quantum yield and exciton dynamics in Mn-doped CdS/ZnS
nanocrystals. Surprisingly Mn-luminescence quantum yield was found to increase in presence of octanethiol in contrary to undoped
nanocrystals where octanethiol almost quenched the exciton emission. Combining transient absorption measurements with steady state Mn-photoluminescence and Mn-lifetime measurements, we confirmed the existence of an energy transfer process from octanethiol created hole traps to Mn that enhances the Mn-photoluminescence.
Apart from studying the effect of surface environment in exciton relaxation dynamics in Mn-doped
nanocrystals, we have studied the effect of surfactant and solvent on the spin relaxation dynamics in
magnetic nanocrystals through transient Faraday rotation measurements. The spin-lattice relaxation rate in spherical Fe_(3)O_(4)
nanocrystals depends on the functional group and binding nature of the surfactant. Also, the solvent affects the spin-lattice relaxation rate only when they can access the surface of the
nanocrystals. Therefore, thick surfactant passivation prevents the approach of the solvent molecules resulting spin-lattice relaxation rate independent of solvent environment.
Advisors/Committee Members: Son, Dong Hee (advisor), Hilty, Christian B (committee member), Roshchin, Igor V (committee member).
Subjects/Keywords: Mn-doped nanocrystals; energy transfer; Mn-luminescence; trapping; thiol; magnetic nanocrystals; spin-lattice relaxation
…nanocrystals.
Apart from affecting the exciton dynamics in semiconductor nanocrystals, the
magnetic… …behavior of the magnetic nanocrystals is also greatly influenced by the surface
environment… …controlling charge carrier dynamics and
magnetic properties both in semiconductor nanocrystals and… …magnetic nanocrystals.
However, the role of the surfactants on the exciton dynamics is not well… …magnetic nanocrystals surfactant dependent spin relaxation is not elucidated in great
detail…
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APA (6th Edition):
Maiti, S. (2013). Effect of Surface Environment on Energy Relaxation Dynamics in Photo-Excited Nanocrystals. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/151636
Chicago Manual of Style (16th Edition):
Maiti, Sourav. “Effect of Surface Environment on Energy Relaxation Dynamics in Photo-Excited Nanocrystals.” 2013. Masters Thesis, Texas A&M University. Accessed January 18, 2021.
http://hdl.handle.net/1969.1/151636.
MLA Handbook (7th Edition):
Maiti, Sourav. “Effect of Surface Environment on Energy Relaxation Dynamics in Photo-Excited Nanocrystals.” 2013. Web. 18 Jan 2021.
Vancouver:
Maiti S. Effect of Surface Environment on Energy Relaxation Dynamics in Photo-Excited Nanocrystals. [Internet] [Masters thesis]. Texas A&M University; 2013. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/1969.1/151636.
Council of Science Editors:
Maiti S. Effect of Surface Environment on Energy Relaxation Dynamics in Photo-Excited Nanocrystals. [Masters Thesis]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/151636
Universidade Estadual de Campinas
15.
Brandl, Ana Lucia.
Propriedades magnéticas de sistemas nanocristalinos.
Degree: 2004, Universidade Estadual de Campinas
URL: http://repositorio.unicamp.br/jspui/handle/REPOSIP/278234
► Abstract: Granular magnetic systems are formed by magnetic grains whose size is of the order of a few nanometers, embedded in a non-magnetic (insulating or…
(more)
▼ Abstract: Granular
magnetic systems are formed by
magnetic grains whose size is of the order of a few nanometers, embedded in a non-
magnetic (insulating or metallic) matrix. These ultrafine particle systems present size, shape, and anisotropy distributions, besides randomly orientated easy directions.
Magnetic interactions always exist, being stronger or weaker according to the volume concentration and the matrix type. These systems have shown interesting magnetotransport properties, as giant magnetoresistance and giant Hall effect. Owing to the inherent complexity of the nanostructure, the magnetization can be analytically calculated only in two limiting cases: when T = 0 (Stoner-Wohlfarth model) or for high temperatures (Langevin model). The Langevin model presents very good results when applied at temperatures higher than the mean blocking temperature (TB) of the system. However this adequacy can be just apparent: the obtained structural parameters are very different from the real ones, as we show in this work. These discrepancies can be attributed to
magnetic interactions andanisotropy effects, both unconsidered in the Langevin formalism. The main results presented in this thesis were obtained from a set of metal-insulator granular films, composed of Co nanoparticles immersed in an amorphous SiO2 matrix. The films were produced by magnetron co-sputtering. The
magnetic characterization was perfomed with magnetization loops, zero-field cooled and field cooled susceptibilities, and thermoremanent magnetization. The microstructural characterization was done by transmission electron microscopy, x-ray diffraction, and small angle x-ray scattering
Advisors/Committee Members: UNIVERSIDADE ESTADUAL DE CAMPINAS (CRUESP), Knobel, Marcelo, 1968- (advisor), Universidade Estadual de Campinas. Instituto de Física Gleb Wataghin (institution), Programa de Pós-Graduação em Física (nameofprogram), Goya, Gerardo Fabian (committee member), Zanchet, Daniela (committee member), Pagliuso, Pascoal José Giglio (committee member), Schulz, Peter Alexander Bleinroth (committee member).
Subjects/Keywords: Nanocristais - Propriedades magnéticas; Nanopartículas; Magnetismo; Nanocrystals - Magnetic properties; Nanoparticles; Magnetism
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APA (6th Edition):
Brandl, A. L. (2004). Propriedades magnéticas de sistemas nanocristalinos. (Thesis). Universidade Estadual de Campinas. Retrieved from http://repositorio.unicamp.br/jspui/handle/REPOSIP/278234
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Brandl, Ana Lucia. “Propriedades magnéticas de sistemas nanocristalinos.” 2004. Thesis, Universidade Estadual de Campinas. Accessed January 18, 2021.
http://repositorio.unicamp.br/jspui/handle/REPOSIP/278234.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Brandl, Ana Lucia. “Propriedades magnéticas de sistemas nanocristalinos.” 2004. Web. 18 Jan 2021.
Vancouver:
Brandl AL. Propriedades magnéticas de sistemas nanocristalinos. [Internet] [Thesis]. Universidade Estadual de Campinas; 2004. [cited 2021 Jan 18].
Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/278234.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Brandl AL. Propriedades magnéticas de sistemas nanocristalinos. [Thesis]. Universidade Estadual de Campinas; 2004. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/278234
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Indian Institute of Science
16.
Arora, Neha.
Rational Synthesis, Stabilization, and Functional Properties of Metal and Intermetallic Nanoparticles.
Degree: PhD, Faculty of Science, 2018, Indian Institute of Science
URL: http://etd.iisc.ac.in/handle/2005/3377
► The confluence of intriguing size and morphology dependent optical and chemical properties with versatile application in various fields, such as energetic and magnetic makes monometallic…
(more)
▼ The confluence of intriguing size and morphology dependent optical and chemical properties with versatile application in various fields, such as energetic and
magnetic makes monometallic nonmaterial of high fundamental scientific interest. However, the challenge that needs to be addressed is to achieve their synthesis with a rational control on their dimensions, morphology and dispersion for the widespread applications of these materials. In addition to synthesis, achieving long-lasting stability of nonmaterial becomes imperative in order to realize their potential applications. Miniaturization in size of particles results in an increased surface to volume ratio, conducing especially reactive metal nanoparticals prone to oxidation. This thesis describes the synthesis of nearly monodiperse colloids of metallic and intermetallic nanoparticles using solvated metal atom dispersion method and digestive ripening facilitated interatomic diffusion process. Our aim is to understand the combinatiorial effects of nanosizing and stability on the functional properties of these nanomaterials. Towards this Direction, we investigated Co, A1 and Mg monometallic, and Au/Ag-In and Au-Sn intermetallic nanoparticle systems.
Chapter 2
Describes the synthesis, detailed characterizations and
magnetic properties of nearly monodisperse cobolt nanoparticles(<5nm) synthesized using a hydride synthetic protocol, solvated metal atom diserion method. The as-prepared cobalt nanoparticles in this size range exhibit intrinsic instability towards Oxidations. After 30 day of exposure to air,
magnetic measurements showed drastic degration in saturation magnetization and complete conversion to antiferromagnetic cobalt oxide was confirmed. In order to achieve their stability, a heat treatment was applied to decompose the organic solvent and capping agent, resulting in carbonization of solvent/ligand around the surface of cobolt nano particles. Controlled and optimized annealing at different temperatures resulted in the formation of hexagonal closed packed (hcp) and fape-centered cubic (fcc) phases of metallic cobalt. Remarkably, the corresponding heat treated samples retained their rich
magnetic behavior even after exposure to air for a duration of one year. Compared to un-annealed samples, magnetization values increased two-fold and the corecivity of nanoparticles exhibited strong dependence on the phase transformation of cobolt.
Chapter 3
Deal with an exploratory study of the synthesis, characterization, and stabilization of nanometer-sized enegetic material, aluminum. Highly monodisperse colloidal aluminum nanoparticles (3.1‡ 0.6 mm) were prepared by using hexadecy amine (HAD) as the capping agent tetrahydrofurma as a coordinating solvent in the SMAD method. Since such small particles are highly prone to oxidation, a support materials is required for their stabilization. Stability has been achived by carbonization of the capping agent on the surface of A1 nanoparticles by carrying out thermal treatment of A1-HAD nanoparticles at a modest…
Advisors/Committee Members: Jagirdar, Balaji R (advisor).
Subjects/Keywords: Metal Nanoparticles; Intermetallic Nanoparticles; Nanoparticles - Synthesis; Cobalt Nanoparticles; Energetic Nanoparticles; Nanoparticles - Stabilization; Nanoparticles - Functional Properties; Nanomaterials; Magnetic Nanomaterials; Intermetallic Nanocrystals - Digestive Ripening; Nanomaterials; Co Nanoparticles; Aluminium Nanoparticles; Nanotechnolgy
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APA (6th Edition):
Arora, N. (2018). Rational Synthesis, Stabilization, and Functional Properties of Metal and Intermetallic Nanoparticles. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3377
Chicago Manual of Style (16th Edition):
Arora, Neha. “Rational Synthesis, Stabilization, and Functional Properties of Metal and Intermetallic Nanoparticles.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed January 18, 2021.
http://etd.iisc.ac.in/handle/2005/3377.
MLA Handbook (7th Edition):
Arora, Neha. “Rational Synthesis, Stabilization, and Functional Properties of Metal and Intermetallic Nanoparticles.” 2018. Web. 18 Jan 2021.
Vancouver:
Arora N. Rational Synthesis, Stabilization, and Functional Properties of Metal and Intermetallic Nanoparticles. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Jan 18].
Available from: http://etd.iisc.ac.in/handle/2005/3377.
Council of Science Editors:
Arora N. Rational Synthesis, Stabilization, and Functional Properties of Metal and Intermetallic Nanoparticles. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3377
Université de Bordeaux I
17.
Biadala, Louis.
Propriétés optiques de nanocristaux de CdSe/ZnS individuels à basse température : Réseau d’actionneurs électromagnétiques numériques : caractérisation d’une application de type convoyage et conception optimisée.
Degree: Docteur es, Lasers, matière et nanosciences, 2010, Université de Bordeaux I
URL: http://www.theses.fr/2010BOR14044
► Les nanocristaux de CdSe font l'objet d'applications émergentes dans les domaines de la nano-électronique, des technologies laser ou du marquage fluorescent de biomolécules. Pour ces…
(more)
▼ Les nanocristaux de CdSe font l'objet d'applications émergentes dans les domaines de la nano-électronique, des technologies laser ou du marquage fluorescent de biomolécules. Pour ces applications, la détermination de la structure fine de l'exciton de bord de bande et des mécanismes de relaxation entre sous-niveaux est d'un intérêt majeur. Cette thèse a été consacrée à l'étude spectroscopique à basse température et sous champ magnétique de nanocristaux individuels de CdSe/ZnS. La remarquable photostabilité des nanocristaux étudiés a permis de caractériser les propriétés optiques des deux états excitoniques de plus basse énergie: l'état excitonique fondamental "noir", et l'état excitonique "brillant" situé quelques meV plus haut en énergie. Ces études ont aussi permis d'identifier un état excitonique chargé (trion) et de caractériser ses propriétés photophysiques. La possibilité de générer une cascade radiative biexciton-exciton a également été démontrée dans ces systèmes.
CdSe nanocrystals are attractive for many applications such as nanoscale electronics, laser technology, and biological fluorescent labelling. A detailed understanding of the band-edge exciton fine structure and the relaxations pathways between sub-levels are crucial for these applications. During this project we have studied the optical properties of single CdSe/ZnS nanocrystals at cryogenical temperature and under magnetic field. The dramatic photostability of the nanocrystals' emission has allowed the optical study of the two lowest exciton states: the "dark" excitonic state and the "bright" excitonic state, lying few meV above. These studies have also enabled us to identify a charged excitonic state (negative trion) and to characterize its photophysical properties. Besides we have demonstrated that in these nanocrystals, radiative cascade biexciton-exciton might be generated.
Advisors/Committee Members: Tamarat, Philippe (thesis director), Lounis, Brahim (thesis director).
Subjects/Keywords: Nanocristaux semiconducteurs; Molécule unique; Spectroscopie d'émission; Spectroscopie d'excitation; Cryogénie; Champ magnétique; Multiexciton; Trion; Nanocrystals semiconductor; Single molecule; Emission spectroscopy; Excitation spectroscopy; Cryogenie; Magnetic …eld; Multiexciton; Trion
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APA (6th Edition):
Biadala, L. (2010). Propriétés optiques de nanocristaux de CdSe/ZnS individuels à basse température : Réseau d’actionneurs électromagnétiques numériques : caractérisation d’une application de type convoyage et conception optimisée. (Doctoral Dissertation). Université de Bordeaux I. Retrieved from http://www.theses.fr/2010BOR14044
Chicago Manual of Style (16th Edition):
Biadala, Louis. “Propriétés optiques de nanocristaux de CdSe/ZnS individuels à basse température : Réseau d’actionneurs électromagnétiques numériques : caractérisation d’une application de type convoyage et conception optimisée.” 2010. Doctoral Dissertation, Université de Bordeaux I. Accessed January 18, 2021.
http://www.theses.fr/2010BOR14044.
MLA Handbook (7th Edition):
Biadala, Louis. “Propriétés optiques de nanocristaux de CdSe/ZnS individuels à basse température : Réseau d’actionneurs électromagnétiques numériques : caractérisation d’une application de type convoyage et conception optimisée.” 2010. Web. 18 Jan 2021.
Vancouver:
Biadala L. Propriétés optiques de nanocristaux de CdSe/ZnS individuels à basse température : Réseau d’actionneurs électromagnétiques numériques : caractérisation d’une application de type convoyage et conception optimisée. [Internet] [Doctoral dissertation]. Université de Bordeaux I; 2010. [cited 2021 Jan 18].
Available from: http://www.theses.fr/2010BOR14044.
Council of Science Editors:
Biadala L. Propriétés optiques de nanocristaux de CdSe/ZnS individuels à basse température : Réseau d’actionneurs électromagnétiques numériques : caractérisation d’une application de type convoyage et conception optimisée. [Doctoral Dissertation]. Université de Bordeaux I; 2010. Available from: http://www.theses.fr/2010BOR14044
18.
Hutfluss, Lisa.
Studies in Pure and Transition Metal Doped Indium Oxide Nanocrystals.
Degree: 2015, University of Waterloo
URL: http://hdl.handle.net/10012/9212
► Controlling the crystal structure of transparent metal oxides is essential for tailoring the properties of these polymorphic materials to specific applications. Structural control is usually…
(more)
▼ Controlling the crystal structure of transparent metal oxides is essential for tailoring the properties of these polymorphic materials to specific applications. Structural control is usually achieved via solid state phase transformation at high temperature or pressure. The first half of this work is a kinetic study of in situ phase transformation of In2O3 nanocrystals from metastable rhombohedral phase to stable cubic phase during their colloidal synthesis. By examining the phase content as a function of time using the model fitting approach, two distinct coexisting mechanisms are identified ― surface and interface nucleation. It is shown that the mechanism of phase transformation can be controlled systematically through modulation of temperature and precursor to solvent ratio. The increase in both of these parameters leads to gradual change from surface to interface nucleation, which is associated with the increased probability of nanocrystal contact formation in the solution phase. The activation energy for surface nucleation is found to be 144±30 kJ/mol, very similar to that for interface nucleation. In spite of the comparable activation energy, interface nucleation dominates at higher temperatures due to increased nanocrystal interactions. The results of this work demonstrate enhanced control over polymorphic nanocrystal systems, and contribute to further understanding of the kinetic processes at the nanoscale, including nucleation, crystallization, and biomineralization.
The ability to further modify the properties of transparent metal oxides through doping of transition metal ions into the host lattice offers a world of possibilities in terms of viable systems and applications. In particular, the use of transition metal dopants to induce room temperature ferromagnetic behaviour in non-magnetic transparent metal oxides is highly desirable for applications such as spintronics. Thus, the second half of this study is concerned with the doping of Fe into nanocrystalline In2O3 via colloidal synthesis and the fundamental characterization of the nanocrystals in anticipation of further development of these materials for potential spintronics applications. Focus is placed on the relationship between the doping concentration, observed phase of the host lattice, and nanocrystal growth and properties. Structural characterizations determine that Fe as a dopant behaves quite unlike previously studied dopants, Cr and Mn, establishing a positive correlation between increasing nanocrystal size and increasing doping concentration; the opposite was observed in the aforementioned previous systems. Through analysis of X-ray absorption near edge structure spectra and the pre-edge feature, it is found that ca. 10% of the assimilated Fe is reduced to Fe2+ during synthesis. Magnetization measurements reveal that these nanocrystals are weakly ferromagnetic at room temperature, suggesting the possibility of an interfacial defect mediated mechanism of magnetic interactions. With increasing doping concentration, the decrease in saturation…
Subjects/Keywords: phase transformation; nanocrystals; transparent conducting oxides; dilute magnetic semiconductors
…30
Chapter 4 – Fundamental Characterization of Iron Doped Indium Oxide Nanocrystals… …48
4.4 Magnetic Properties… …54
5.1.1 Phase Transformation of Colloidal Indium Oxide Nanocrystals… …54
5.1.2 Iron-Doping of Colloidal Indium Oxide Nanocrystals… …Figure 4.8: Magnetic hysteresis loop of an Fe-doped In2O3 nanocrystalline thin film collected…
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APA ·
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APA (6th Edition):
Hutfluss, L. (2015). Studies in Pure and Transition Metal Doped Indium Oxide Nanocrystals. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/9212
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hutfluss, Lisa. “Studies in Pure and Transition Metal Doped Indium Oxide Nanocrystals.” 2015. Thesis, University of Waterloo. Accessed January 18, 2021.
http://hdl.handle.net/10012/9212.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hutfluss, Lisa. “Studies in Pure and Transition Metal Doped Indium Oxide Nanocrystals.” 2015. Web. 18 Jan 2021.
Vancouver:
Hutfluss L. Studies in Pure and Transition Metal Doped Indium Oxide Nanocrystals. [Internet] [Thesis]. University of Waterloo; 2015. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/10012/9212.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hutfluss L. Studies in Pure and Transition Metal Doped Indium Oxide Nanocrystals. [Thesis]. University of Waterloo; 2015. Available from: http://hdl.handle.net/10012/9212
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universitat Autònoma de Barcelona
19.
Saha, Arpita.
Tuning the properties of quantum nanocrystals and magnetic nanoparticles using spherical ligands: carboranes and metallacarboranes.
Degree: Departament de Química, 2019, Universitat Autònoma de Barcelona
URL: http://hdl.handle.net/10803/667956
► The research presented in this thesis has been summarized as a compendium of articles published and to be published in the future. There are five…
(more)
▼ The research presented in this thesis has been summarized as a compendium of articles published and to be published in the future. There are five chapters dealing with the results and discussions. The results and discussions are preceded by a general introduction and objectives. The summary of each chaper of the results is given below.
The 1st chapter deals with aqueous quantum dots (QDs) capped with meta-carboranyl phosphinate which gives us a brand new architecture of QDs named as core-canopy QDs. This is the first time spherical ligands have been experimentally used to cap QDs. Due to this architecture, we obtained a new luminescence property in these QDs, called the kinetic fluorescence switching (KFS) which has never been reported before. It is a new phenomenon in which the luminescence fades with time but upon application of kinetic energy regains the full intensity of emission. These core-canopy QDs can trap anions and act like capacitors, they are compared with other QDs and characterized.
The next chapter deals with synthesis of QDs in water using a new set up developed by us. It produces QDs with high PL, QY and longer lifetime of emission in water medium. The set up used is different to the reflux based method used to synthesize QDs in water at 100 °C. Here we used a cork insulated sand bath, with ace pressure tubes of glass. The QDs are generated in these pressure tubes at 150 °C under autogeneous pressure produced by the tubes. They have been compared to the traditional water based QDs and charaterized. These QDs combine the advanatge of high QY and different luminescence colours of organometallic synthesized QDs and the easy and cheap production of a water based synthesis.
The next chapter deals with quantum
nanocrystals (QNCs) being synthesized in water for the first time. We have demonstrated an easy synthetic route and setup design using which quantum rods (Qrods) and quantum rings (QRs) can be easily synthesized in a water medium. This is the first time that this has been experimentally synthesized and studied. These QNCs could be easily stored in powdered form, remain suspended in various solvents for more than 18 months, without degradation in their colloidal stability or luminescence properties. Moreover, they can be used to form nancomposites using polymers. These polymeric films containing the QNCs showed luminescence which lasted over a year and could also show electroluminescence, hence making them viable for QLED applications in the future.
The 4th chapter of the results and discussions deals with
magnetic nanoparticles (MNPs) coated with meta-carboranyl phosphinate. These give rise to new nano-hybrids which can be used for biological application of boron neutron capture therapy (BNCT). These nanohybrids have been synthesized, characterized and used in biological applications. Their
magnetic properties and stability has been studied after autoclave sterilization, further their colloidal stability in different biological culture mediums has also been studied. Then their cellular…
Advisors/Committee Members: [email protected] (authoremail), true (authoremailshow), Teixidor i Bombardo, Francesc (director), Viñas i Teixidor, Clara (director), Suades Ortuño, Joan (tutor).
Subjects/Keywords: Nanocristalls quàntics; Nanocristales cuánticos; Quiantum nanocrystals; Nanopartícules magnètiques; Nanopartículas magnéticas; Magnetic nanoparticles; Carboranes i metallacorboranes; Carboranes y metallacarboranes; Carboranes and metallacarboranes; Ciències Experimentals; 54
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APA ·
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APA (6th Edition):
Saha, A. (2019). Tuning the properties of quantum nanocrystals and magnetic nanoparticles using spherical ligands: carboranes and metallacarboranes. (Thesis). Universitat Autònoma de Barcelona. Retrieved from http://hdl.handle.net/10803/667956
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Saha, Arpita. “Tuning the properties of quantum nanocrystals and magnetic nanoparticles using spherical ligands: carboranes and metallacarboranes.” 2019. Thesis, Universitat Autònoma de Barcelona. Accessed January 18, 2021.
http://hdl.handle.net/10803/667956.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Saha, Arpita. “Tuning the properties of quantum nanocrystals and magnetic nanoparticles using spherical ligands: carboranes and metallacarboranes.” 2019. Web. 18 Jan 2021.
Vancouver:
Saha A. Tuning the properties of quantum nanocrystals and magnetic nanoparticles using spherical ligands: carboranes and metallacarboranes. [Internet] [Thesis]. Universitat Autònoma de Barcelona; 2019. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/10803/667956.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Saha A. Tuning the properties of quantum nanocrystals and magnetic nanoparticles using spherical ligands: carboranes and metallacarboranes. [Thesis]. Universitat Autònoma de Barcelona; 2019. Available from: http://hdl.handle.net/10803/667956
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Texas – Austin
20.
Lee, Doh Chang, 1978-.
Silicon nanowires, carbon nanotubes, and magnetic nanocrystals: synthesis, properties, and applications.
Degree: PhD, Chemical Engineering, 2007, University of Texas – Austin
URL: http://hdl.handle.net/2152/3229
► Central to the practical use of nanoscale materials is the controlled growth in technologically meaningful quantities. Many of the proposed applications of the nanomaterials potentially…
(more)
▼ Central to the practical use of nanoscale materials is the controlled growth in technologically meaningful quantities. Many of the proposed applications of the nanomaterials potentially require inexpensive production of the building blocks. Solution-based synthetic approach offers controllability, high throughput, and scalability, which make the process attractive for the potential scale-up. Growth kinetics could be readily influenced by chemical interactions between the precursor and the solvent. In order to fully utilize its benefits, it is therefore pivotal to understand the decomposition chemistry of the precursors used in the reactions. Supercritical fluids were used as solvent in which high temperature reactions could take place. Silicon nanowires with diameters of 20~30 nm was synthesized in supercritical fluids with metal
nanocrystals as seeds for the nanowire growth. To unravel the effect of silicon precursors, several silicon precursors were reacted and the resulting products were investigated. The scalability of the system is discussed based on the experimental data. The nanowires were characterized with various characterization tools, including high-resolution transmission electron microscopy and electron energy loss spectroscopy. The crystallographic signatures were analyzed through the transmission electron microscopic study, and fundamental electrical and optical properties were probed by electron energy loss spectroscopy. Carbon nanotubes were prepared by reacting carbon-containing chemicals in supercritical fluids with organometallic compounds that form metal seed particles in-situ. A batch reaction, in which the temperature control was relatively poor, yielded a mixture of multiwall nanotubes and amorphous carbon nanofilaments with a low selectivity of nanotubes in the product. When reaction parameters were translated into a continuous flow-through reaction, nanotube selectivity as well as the throughput of the total product significantly improved.
Magnetic properties of various metal
nanocrystals were also studied. Colloidal synthesis enables the growth of FePt and MnPt3
nanocrystals with size uniformity. The as-synthesized
nanocrystals, however, had compositionally disordered soft-
magnetic phases. To obtain hard
magnetic layered phase, the
nanocrystals must be annealed at high temperatures, which led to sintering of the inorganic cores. To prevent sintering, the
nanocrystals were encapsulated with silica layer prior to annealing. Interparticle
magnetic interactions were also explored using particles with varying silica thickness.
Advisors/Committee Members: Korgel, Brian A., 1969- (advisor).
Subjects/Keywords: Nanostructured materials; Nanocrystals – Magnetic properties; Nanostructured materials – Electric properties; Nanostructured materials – Optical properties
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APA (6th Edition):
Lee, Doh Chang, 1. (2007). Silicon nanowires, carbon nanotubes, and magnetic nanocrystals: synthesis, properties, and applications. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/3229
Chicago Manual of Style (16th Edition):
Lee, Doh Chang, 1978-. “Silicon nanowires, carbon nanotubes, and magnetic nanocrystals: synthesis, properties, and applications.” 2007. Doctoral Dissertation, University of Texas – Austin. Accessed January 18, 2021.
http://hdl.handle.net/2152/3229.
MLA Handbook (7th Edition):
Lee, Doh Chang, 1978-. “Silicon nanowires, carbon nanotubes, and magnetic nanocrystals: synthesis, properties, and applications.” 2007. Web. 18 Jan 2021.
Vancouver:
Lee, Doh Chang 1. Silicon nanowires, carbon nanotubes, and magnetic nanocrystals: synthesis, properties, and applications. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2007. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/2152/3229.
Council of Science Editors:
Lee, Doh Chang 1. Silicon nanowires, carbon nanotubes, and magnetic nanocrystals: synthesis, properties, and applications. [Doctoral Dissertation]. University of Texas – Austin; 2007. Available from: http://hdl.handle.net/2152/3229
21.
Κωστοπούλου, Αθανασία.
Σύνθεση και χαρακτηρισμός υβριδικών δομών νανοκρυστάλλων με ρυθμιζόμενες ιδιότητες.
Degree: 2012, University of Crete (UOC); Πανεπιστήμιο Κρήτης
URL: http://hdl.handle.net/10442/hedi/28663
► Considerable progress in the synthesis of colloidal inorganic nanocrystas has allowed their exploitation in different applications, ranging from electronics to biomedicine. A significant advancement in…
(more)
▼ Considerable progress in the synthesis of colloidal inorganic nanocrystas has allowed their exploitation in different applications, ranging from electronics to biomedicine. A significant advancement in the syntheses of nanocrystals entails the capacity to afford not only single- but multi- material hybrids. This thesis presents the development of colloidal chemistry protocols and the characterization of a self-assembled secondary structure (nanocluster) and a hybrid multimaterial heterostructure.
The nanoclusters involve a low cytotoxivity assembly of small γ-Fe2O3 nanocrystals (NCs). The colloidal assemblies are ferrimagnetic in aqueous dispersions and composed of crystallographically aligned NCs. The colloid of nanoclusters operates as a tunable photonic crystal under a moderate magnetic field. Their potential in biomedical diagnosis (MRI) and therapy (magnetic hyperthermia) is shown. Due to their tailored magneto-structural characteristics, the intra-cluster magnetic material volume fraction is raised, in turn producing a remarkable improvement of the transverse 1H-NMR relaxivity (4-5 times higher than that of the commercial contrast agent Endorem®) and a much higher Specific Loss Power is attained than that of other rival nanostructures.
The hybrid heterostructure consists of ZnO nanorods uniformly covered by size-tunable [email protected] core-shell nanocrystals. The bi-functional [cf. with near band-edge (NBE) UV fluorescence and ferromagnetism at 300 K] nanomaterial is characterized by an extended surface coverage with small [email protected] nanodomains, where the interfacial coupling across the Fe-core and FexOy-shell generates exchange-bias, mediated by frozen interfacial spins. In the case of a lower coverage density by larger [email protected] domains, the operating Kirkendall effect between the core and the shell suppresses the exchange coupling anisotropy. Importantly, the interfacial interactions between [email protected] scale with the degree of surface coverage and a strain-induced blue-shift of the NBE is observed.
Η σημαντική πρόοδος στη σύνθεση κολλοειδών ανόργανων νανοκρυστάλλων έχει επιτρέψει και την αξιοποίησή τους σε διάφορες εφαρμογές από την ηλεκτρονική μέχρι τη βιοιατρική. Αξιοσημείωτη πρόοδος στις συνθέσεις νανοκρυστάλλων έχει οδηγήσει στη δυνατότητα παρασκευής υβριδικών νανοκρυστάλλων όχι μόνο μιας φάσης, αλλά και συνδυασμού διαφορετικών υλικών. Σε αυτήν την κατεύθυνση, η διατριβή αυτή παρουσιάζει την ανάπτυξη με μεθόδους κολλοειδούς χημείας και το χαρακτηρισμό μιας δευτερογενούς δομής που έχει σχηματιστεί από αυτοοργάνωση νανοκρυστάλλων (νανοσυσσωμάτωμα) και μιας υβριδικής ετεροδομής πολλαπλών υλικών.
Το νανοσυσσωμάτωμα είναι χαμηλής κυτταροτοξικότητας και προέκυψε από αυτοοργάνωση μικρών νανοκρυστάλλων Fe2O3. Στα υδατικά τους διαλύματα είναι σιδηριμαγνητικά και αποτελούνται από κρυσταλλογραφικά προσανατολισμένους νανοκρυστάλλους. Το κολλοειδές διάλυμα των νανοσυσσωματωμάτων λειτουργεί επίσης ως ελεγχόμενος φωτονικός κρύσταλλος υπό την εφαρμογή ενός κατάλληλου μαγνητικού πεδίου. Επιπλέον, παρουσιάζεται η δυνατότητα…
Subjects/Keywords: Νανοσυσσωμάτωμα; Υβριδική ετεροδομή; Μαγνητικοί νανοκρύσταλλοι; Κολλοειδής χημεία; Απεικόνιση μαγνητικού συντονισμού; Σκιαγραφικό μέσο; Δομή πυρήνα-κελύφους; Οξείδιο του σιδήρου; Πόλωση λόγω ανταλλαγής; Μαγνητική υπερθερμία; Nanocluster; Hybrid heterostructure; Magnetic nanocrystals; Colloidal chemistry; Magnetic resonance imaging; Contrast agent; Core-shell structure; Iron oxide; Exchange bias; Magnetic Hyperthermia
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APA (6th Edition):
Κωστοπούλου, . . (2012). Σύνθεση και χαρακτηρισμός υβριδικών δομών νανοκρυστάλλων με ρυθμιζόμενες ιδιότητες. (Thesis). University of Crete (UOC); Πανεπιστήμιο Κρήτης. Retrieved from http://hdl.handle.net/10442/hedi/28663
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Κωστοπούλου, Αθανασία. “Σύνθεση και χαρακτηρισμός υβριδικών δομών νανοκρυστάλλων με ρυθμιζόμενες ιδιότητες.” 2012. Thesis, University of Crete (UOC); Πανεπιστήμιο Κρήτης. Accessed January 18, 2021.
http://hdl.handle.net/10442/hedi/28663.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Κωστοπούλου, Αθανασία. “Σύνθεση και χαρακτηρισμός υβριδικών δομών νανοκρυστάλλων με ρυθμιζόμενες ιδιότητες.” 2012. Web. 18 Jan 2021.
Vancouver:
Κωστοπούλου . Σύνθεση και χαρακτηρισμός υβριδικών δομών νανοκρυστάλλων με ρυθμιζόμενες ιδιότητες. [Internet] [Thesis]. University of Crete (UOC); Πανεπιστήμιο Κρήτης; 2012. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/10442/hedi/28663.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Κωστοπούλου . Σύνθεση και χαρακτηρισμός υβριδικών δομών νανοκρυστάλλων με ρυθμιζόμενες ιδιότητες. [Thesis]. University of Crete (UOC); Πανεπιστήμιο Κρήτης; 2012. Available from: http://hdl.handle.net/10442/hedi/28663
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
22.
Yin, Penghui.
Plasmon Induced Carrier Polarization in Semiconductor Nanocrystals.
Degree: 2020, University of Waterloo
URL: http://hdl.handle.net/10012/15568
► Currently used technologies are reaching the natural performance limit, invigorating the development of different quantum technologies. Spintronics and valleytronics are emerging quantum electronic technologies that…
(more)
▼ Currently used technologies are reaching the natural performance limit, invigorating the development of different quantum technologies. Spintronics and valleytronics are emerging quantum electronic technologies that rely on using electron spin and multiple extrema of the band structure (valleys), respectively, as additional degrees of freedom. There are also collective properties of electrons in semiconductor nanostructures that potentially could be exploited in multifunctional quantum devices. Specifically, plasmonic semiconductor nanocrystals (NCs) offer an opportunity for interface-free coupling between a plasmon and an exciton. However, plasmon–exciton coupling in single-phase semiconductor NCs remains challenging because confined plasmon oscillations are generally not resonant with excitonic transitions. In this thesis, using magnetic circular dichroism (MCD) spectroscopy, I examined the electron polarization in plasmonic semiconductor NCs, and the effect of electron localization, plasmon oscillator strength and damping, as well as NC morphology on carrier polarization. The results effectively open up the field of plasmontronics, which involves the phenomena that arise from intrinsic plasmon–exciton and plasmon–spin interactions. Furthermore, the dynamic control of carrier polarization allows us to harness the magnetoplasmonic mode as a new degree of freedom in practical photonic, optoelectronic and quantum-information processing devices.
First, we demonstrated the control of excitonic splitting in In2O3 NCs upon excitation with circularly polarized light in an external magnetic field by simultaneous control of the electronic structure of donor defects and the nanocrystal host lattice. Using variable-temperature− variable-field MCD spectroscopy, we show that the NC band splitting has two distinct contributions in plasmonic In2O3 NCs. Temperature-independent splitting arises from the cyclotron magnetoplasmonic modes, which impart angular momentum to the conduction band excited states near the Fermi level, and increases with the intensity of the corresponding plasmon resonance. Temperature-dependent splitting is associated with the localized electron spins trapped in defect states. The ratio of the two components can be controlled by the formation of oxygen vacancies or introduction of aliovalent dopants. Using these experimental results in conjunction with the density functional theory modeling, relative contribution of the two mechanisms is discussed in the context of the perturbation theory taking into account energy separation between the NC excited states and the localized defect states.
To implement such opportunities it is essential to develop robust understanding of the parameters that influence magnetoplasmon-induced carrier polarization. I investigated comparatively the plasmonic properties of Mo-doped In2O3 (IMO) and W-doped In2O3 (IWO) NCs, with a particular emphasis on the role of plasmonic properties on excitonic splitting. In contrast to tungsten dopants, which are predominantly in 6+ oxidation…
Subjects/Keywords: plasmonic semiconductors; plasmon-exciton coupling; Zeeman splitting; oxygen vacancy; exchange coupling; magnetic circular dichroism; indium oxide nanocrystals; titanium dioxide nanocrystals; Semiconductor nanocrystals; Magnetic circular dichroism; Surface plasmon resonance; Nanostructured materials
…1
1.1 Localized Surface Plasmon Resonance in Semiconductor Nanocrystals… …13
1.3 Magnetic Circular Dichroism of LSPR… …19
1.5.2 Diluted Magnetic Semiconductors… …28
2.3.9 Magnetic Circular Dichroism… …33
Chapter 3 Plasmon-Induced Carrier Polarization in Sn doped In2O3 Nanocrystals…
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APA ·
Chicago ·
MLA ·
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Manager
APA (6th Edition):
Yin, P. (2020). Plasmon Induced Carrier Polarization in Semiconductor Nanocrystals. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/15568
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Yin, Penghui. “Plasmon Induced Carrier Polarization in Semiconductor Nanocrystals.” 2020. Thesis, University of Waterloo. Accessed January 18, 2021.
http://hdl.handle.net/10012/15568.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Yin, Penghui. “Plasmon Induced Carrier Polarization in Semiconductor Nanocrystals.” 2020. Web. 18 Jan 2021.
Vancouver:
Yin P. Plasmon Induced Carrier Polarization in Semiconductor Nanocrystals. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/10012/15568.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Yin P. Plasmon Induced Carrier Polarization in Semiconductor Nanocrystals. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/15568
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Georgia Tech
23.
Sathe, Tushar R.
Integrated Magnetic and Optical Nanotechnology for Early Cancer Detection and Monitoring.
Degree: PhD, Biomedical Engineering, 2007, Georgia Tech
URL: http://hdl.handle.net/1853/19868
► Despite significant developments in imaging modalities and therapeutics, cancer mortality rates remain unchanged. Detecting cancer before it has spread to other organs improves patient outcome…
(more)
▼ Despite significant developments in imaging modalities and therapeutics, cancer mortality rates remain unchanged. Detecting cancer before it has spread to other organs improves patient outcome dramatically. Therefore, greater emphasis must be placed on developing novel technology for early cancer detection and disease monitoring. Nanometer-sized materials have unique optoelectronic and
magnetic properties. In particular, semiconductor quantum dots (QD) are a new class of fluorophores that are bright, photostable, and can be simultaneously excited to emit different wavelengths of light.
Magnetic iron oxide nanoparticles are another class of unique nanomaterials that exhibit superparamagnetism and are strongly magnetized only in the presence of a
magnetic field.
In this dissertation, we describe the integration of semiconductor QDs and
magnetic iron oxide nanoparticles and potential applications for (i) early detection of cancer biomarkers through routine screening, and (ii) disease monitoring through the capture and analysis of rare circulating tumor cells. First, we describe the development of integrated magneto-optical beads that can be optically encoded and magnetically separable for isolating low amounts of biomolecules from solution. Second, we demonstrate improved detection sensitivity by combining immunomagnetic beads and highly luminescent nanoparticles in a sandwich assay. Next, we describe integration of
magnetic and QD nanotechnology for the selective capture and molecular profiling of rare cells. We demonstrate the ability to spectroscopically determine relative molecular levels of markers to identify invasive cells. As disease monitoring requires the analysis of patient blood samples, we have also studied nanoparticle-cell interactions using QDs to determine nanoparticle behavior in whole blood as a function of surface coatings. We observed that anionic nanoparticles with carboxylic acid groups (-COOH) were strongly associated with leukocytes, but interestingly this association was cell specific. Hydroxyl-modified QDs (QD-OH) suppressed binding and uptake by leukocytes as efficiently as PEG-modified QDs. The integration of nanotechnologies represents a new and exciting approach that has the potential to push the limits of detection sensitivity and permit isolation and profiling of multiple biomarkers from large sample volumes.
Advisors/Committee Members: Nie, Shuming (Committee Chair), Bostick, Roberd (Committee Member), Le Doux, Joseph (Committee Member), Murthy, Niren (Committee Member), Wang, Zhong Lin (Committee Member).
Subjects/Keywords: Tumors; Quantum dots; Fluorescence; Magnetic; Nanoparticles; Separation; Nanotechnology; Cancer; Diagnostic imaging; Quantum dots; Iron oxides; Nanoparticles; Nanocrystals
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APA (6th Edition):
Sathe, T. R. (2007). Integrated Magnetic and Optical Nanotechnology for Early Cancer Detection and Monitoring. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/19868
Chicago Manual of Style (16th Edition):
Sathe, Tushar R. “Integrated Magnetic and Optical Nanotechnology for Early Cancer Detection and Monitoring.” 2007. Doctoral Dissertation, Georgia Tech. Accessed January 18, 2021.
http://hdl.handle.net/1853/19868.
MLA Handbook (7th Edition):
Sathe, Tushar R. “Integrated Magnetic and Optical Nanotechnology for Early Cancer Detection and Monitoring.” 2007. Web. 18 Jan 2021.
Vancouver:
Sathe TR. Integrated Magnetic and Optical Nanotechnology for Early Cancer Detection and Monitoring. [Internet] [Doctoral dissertation]. Georgia Tech; 2007. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/1853/19868.
Council of Science Editors:
Sathe TR. Integrated Magnetic and Optical Nanotechnology for Early Cancer Detection and Monitoring. [Doctoral Dissertation]. Georgia Tech; 2007. Available from: http://hdl.handle.net/1853/19868
24.
Brodu, Annalisa.
Exciton Dynamics in InP Quantum Dots : Fine Structure and Radiative Recombination Processes.
Degree: 2019, University Utrecht
URL: https://dspace.library.uu.nl/handle/1874/384189
;
URN:NBN:NL:UI:10-1874-384189
;
1874/384189
;
urn:isbn:9789463804684
;
URN:NBN:NL:UI:10-1874-384189
;
https://dspace.library.uu.nl/handle/1874/384189
► Colloidal quantum dots (QDs) are semiconductor nanocrystals with size- and shape- tunable optical properties, fundamentally different from those of the bulk, and of significant interest…
(more)
▼ Colloidal quantum dots (QDs) are semiconductor
nanocrystals with size- and shape- tunable optical properties, fundamentally different from those of the bulk, and of significant interest in optoelectronics. For decades, CdSe-based QDs have been the workhorses in this field and they have reached a very mature level with a bright and size-tunable photoluminescence in the visible range, making them very suitable for applications in LEDs, displays and TV screens. However, Europa’s legislation does not allow the use of Cd-containing materials for opto-electronic applications. For this reason, the implementation of QDs in commercial devices requires to replace these QDs by toxicologically harmless materials, which should have a similar optical performance. In this respect, the development of III-V QDs, especially of InP, has received increasing attention in recent years. Colloidal hetero-
nanocrystals composed of InP cores show a reasonable photoluminescence quantum yield, a size-tunable emission spectrum in the visible range and a good chemical stability, provided that they are coated with a suitable inorganic shell material. At present, suspensions of well-passivated InP core/shell QDs are prepared by wet-chemical synthesis and this synthesis can be scaled up to industrial production. They show bright emission ranging from the near-IR (1.5 eV) to the green (2.5 eV) spectral range with near-unity photoluminescence quantum yields. It is thus very important to investigate the energy-level structure and optical properties of this promising class of
nanocrystals. The optoelectronic properties of InP core/shell QDs are determined by the chemical nature of both the core and the shell materials, the strain induced on the core due to core/shell epitaxy, and the relative offsets between the conduction and valence band edges of the core and shell materials. The electron and hole can be both localized within the core, or one carrier can be localized in the core and the other in the shell. For all these reasons, the nature of the shell has a strong influence on the radiative processes. This thesis aims to investigate these aspects in detail, providing a fundamental understanding of the physical mechanisms of spontaneous emission by unravelling the exciton fine-structure of InP core/shell nanocrystal quantum dots, and by studying how the exciton recombination depends on the size of the
nanocrystals, the shell composition and core/shell structure, with an emphasis on the active role of the different types of phonons interacting with dark exciton states.
Advisors/Committee Members: Vanmaekelbergh, Daniel, Hens, Z., de Mello-Donega, Celso.
Subjects/Keywords: Colloidal nanocrystals; InP quantum dots; exciton dynamics; fine structure; acoustic and optical phonons; magnetic field
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APA ·
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APA (6th Edition):
Brodu, A. (2019). Exciton Dynamics in InP Quantum Dots : Fine Structure and Radiative Recombination Processes. (Doctoral Dissertation). University Utrecht. Retrieved from https://dspace.library.uu.nl/handle/1874/384189 ; URN:NBN:NL:UI:10-1874-384189 ; 1874/384189 ; urn:isbn:9789463804684 ; URN:NBN:NL:UI:10-1874-384189 ; https://dspace.library.uu.nl/handle/1874/384189
Chicago Manual of Style (16th Edition):
Brodu, Annalisa. “Exciton Dynamics in InP Quantum Dots : Fine Structure and Radiative Recombination Processes.” 2019. Doctoral Dissertation, University Utrecht. Accessed January 18, 2021.
https://dspace.library.uu.nl/handle/1874/384189 ; URN:NBN:NL:UI:10-1874-384189 ; 1874/384189 ; urn:isbn:9789463804684 ; URN:NBN:NL:UI:10-1874-384189 ; https://dspace.library.uu.nl/handle/1874/384189.
MLA Handbook (7th Edition):
Brodu, Annalisa. “Exciton Dynamics in InP Quantum Dots : Fine Structure and Radiative Recombination Processes.” 2019. Web. 18 Jan 2021.
Vancouver:
Brodu A. Exciton Dynamics in InP Quantum Dots : Fine Structure and Radiative Recombination Processes. [Internet] [Doctoral dissertation]. University Utrecht; 2019. [cited 2021 Jan 18].
Available from: https://dspace.library.uu.nl/handle/1874/384189 ; URN:NBN:NL:UI:10-1874-384189 ; 1874/384189 ; urn:isbn:9789463804684 ; URN:NBN:NL:UI:10-1874-384189 ; https://dspace.library.uu.nl/handle/1874/384189.
Council of Science Editors:
Brodu A. Exciton Dynamics in InP Quantum Dots : Fine Structure and Radiative Recombination Processes. [Doctoral Dissertation]. University Utrecht; 2019. Available from: https://dspace.library.uu.nl/handle/1874/384189 ; URN:NBN:NL:UI:10-1874-384189 ; 1874/384189 ; urn:isbn:9789463804684 ; URN:NBN:NL:UI:10-1874-384189 ; https://dspace.library.uu.nl/handle/1874/384189
Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)
25.
Brintakis, Konstantinos.
Growth and organization of hybrid nanocrystals: structural, electronic and magnetic properties.
Degree: 2017, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)
URL: http://hdl.handle.net/10442/hedi/42095
► A remarkable effort has been pursued for the development of nanoparticles. Due to their nanometric size, they exhibit dramatically different properties than their bulk counterparts…
(more)
▼ A remarkable effort has been pursued for the development of nanoparticles. Due to their nanometric size, they exhibit dramatically different properties than their bulk counterparts as they are governed by surface and finite size quantum effects. If the nanoparticles come close together in organized manner, new secondary structures are created that display novel properties. The acquired close-packed nanostructures, named assemblies, manifest collective properties as the nanoparticles they are composed of, interact with each other due to their proximity. In this thesis, maghemite superparamagnetic nanoparticles have been assembled creating a new 3D entity named nanocluster. This nanocluster exhibits room temperature ferrimagnetism and their
magnetic dynamics showed two maxima in the dissipative part of the ac susceptibility, defining two different spin dynamical areas. The low-T maximum is attributed to surface spin glass and the high-T maximum to superspin glass. These two maxima are expressed by a scaling law equation and with the aid of with Monte Carlo simulations corroborate that, the glassines arises from the interplay of dipolar interactions with an additional spin disorder due to the defected nanoparticle surface coordination. The nanoclusters are water soluble with low cytotoxicity and excellent MRI contrast efficiency properties. Additionally, specific loss power (SLP) measurements, showed adequate heating efficacy for the nanoclusters as compared to their individual constituent nanoparticles. The reason for the
magnetic hyperthermia enhancement are the hysteresis losses, which is the main contributing mechanism (in addition to Néel and Brown relaxations) in heating generation. The impact of the nanoclusters on cells (in vitro) was explained against their variable size. The second section of this work is focused on single phase and
[email protected] iron oxide nanoparticles and their assemblies in functional substrates. The initial synthesized phase is wüstite (FeO), which is air sensitive and depending on the nanoparticle’s size, is progressively oxidized to magnetite (Fe3O4), creating either a single phase material or a defected
[email protected] structure. This self-passivation process, is leaving behind defects which are crucial for the net
magnetic behavior. More specifically, spherical nanoparticles compared to cubic ones, show more defected structure due to shape effects and thus exhibit significant larger values of the technological useful property of the exchange bias. Interestingly, exchange bias is found not only in the
[email protected] NPs, where
magnetic exchange coupling of the antiferromagnetic core with the ferromagnetic shell is possible, but also in the apparently single phase particles as well. The reason behind this, is the defected areas promote uncompensated spins, which are coupled with the ferromagnetic or the antiferromagnetic part of a NP, inducing exchange anisotropy. These NPs have been chosen to become organized on a functional piezoelectric substrate. Utilizing their hydrophobic…
Subjects/Keywords: Μαγνητικά νανοσωματίδια οξειδίων του σιδήρου; Μαγνητικοί νανοκρύσταλλοι; Συλλογικές φυσικές ιδιότητες; Νανοσυσσωμάτωμα; Δυναμικές περιοχές σπιν; Υαλώδης συμπεριφορά των σπιν; Διπολικές αλληλεπιδράσεις; Μαγνητική υπερθερμία; Πολλαπλασιασμός κυττάρων; Βιοκατανομή νανοσυσσωμάτων; Δομή πυρήνα-κελύφους; Ατέλειες δομής; Ανισοτροπία ανταλλαγής; Πόλωση ανταλλαγής; Υμένιο νανοσωματιδίων; Magnetic nanoparticles; Magnetic nanocrystals; Collective properties; Nanocluster; Dynamic spin areas; Spin glass behavior; Dipolar interaction; Magnetic hyperthermia; Cell proliferation; Nanoclusters biodistribution; Core-shell structure; Crystal defects; Exchange anisotropy; Exchange bias; Monolayer of nanoparticles
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APA ·
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MLA ·
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CSE |
Export
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APA (6th Edition):
Brintakis, K. (2017). Growth and organization of hybrid nanocrystals: structural, electronic and magnetic properties. (Thesis). Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Retrieved from http://hdl.handle.net/10442/hedi/42095
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Brintakis, Konstantinos. “Growth and organization of hybrid nanocrystals: structural, electronic and magnetic properties.” 2017. Thesis, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Accessed January 18, 2021.
http://hdl.handle.net/10442/hedi/42095.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Brintakis, Konstantinos. “Growth and organization of hybrid nanocrystals: structural, electronic and magnetic properties.” 2017. Web. 18 Jan 2021.
Vancouver:
Brintakis K. Growth and organization of hybrid nanocrystals: structural, electronic and magnetic properties. [Internet] [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2017. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/10442/hedi/42095.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Brintakis K. Growth and organization of hybrid nanocrystals: structural, electronic and magnetic properties. [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2017. Available from: http://hdl.handle.net/10442/hedi/42095
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
26.
Σεργίδης, Ανδρέας.
Μελέτη των παραμέτρων της σύνθεσης υβριδικών κολλοειδών νανοκρυστάλλων με υπερπαραμαγνητικές ιδιότητες για την ανάπτυξη πολυλειτουργικών συστημάτων ελεγχόμενης χορήγησης αντικαρκινικών ουσιών.
Degree: 2014, University of Patras
URL: http://hdl.handle.net/10889/8576
► Η Πακλιταξέλη (PTX) αποτελεί ένα ευρέως διαδεδομένο αντινεοπλασματικό φάρμακο και ενδείκνυται σε μεταστατικό καρκίνο του μαστού, καρκίνο ωοθηκών, μη μικροκυτταρικό καρκίνο του πνεύμονα και σε…
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▼ Η Πακλιταξέλη (PTX) αποτελεί ένα ευρέως διαδεδομένο αντινεοπλασματικό φάρμακο και ενδείκνυται σε μεταστατικό καρκίνο του μαστού, καρκίνο ωοθηκών, μη μικροκυτταρικό καρκίνο του πνεύμονα και σε σάρκωμα Kaposi ασθενών με AIDS. Παρ’ όλα αυτά, η σημαντική τοξικότητα που εμφανίζει (μυελοκαταστολή, νευροτοξικότητα, αντιδράσεις υπερευαισθησίας), υπογραμμίζει την αναγκαιότητα για μορφοποίησή της σε Συστήματα Ελεγχόμενης Χορήγησης Φαρμάκων (DDS), με σκοπό τη μείωση των ανεπιθύμητων ενεργειών και την αύξηση της βιοδιαθεσιμότητας του φαρμάκου.
Τα πολυμερικά μικκύλια έχουν μελετεθεί εκτενώς τα τελευταία χρόνια ως Συστήματα Ελεγχόμενης Χορήγησης Φαρμάκων. Η ενσωμάτωση υπερπαραμαγνητικών νανοκρυσταλλιτών οξειδίου του σιδήρου (SPIONs) στον πυρήνα των PTX-μικκυλίων, παρέχει τη δυνατότητα μαγνητικής στόχευσης του φαρμάκου στην επιθυμητή περιοχή δράσης, καθώς και τη θεραπεία του καρκίνου μέσω επαγωγής μαγνητικής υπερθερμίας, με την εφαρμογή εναλλασσόμενου μαγνητικού πεδίου. Επιπλεόν, η χρήση των SPIONs ως σκιαγραφικά μέσα (Τ2-contrast enhancement) στη μαγνητική τομογραφία πυρηνικού συντονισμού (MRI), εξασφαλίζει το πλεονέκτημα ταυτόχρονης διάγνωσης και θεραπείας (Theranostics), αποκαλύπτοντας την πολυλειτουργικότητα των συστημάτων αυτών. Οι συγκεκριμένοι νανοφορείς, έχοντας μικρό μέγεθος (100-200nm), θεωρούνται κατάλληλοι για να αποφύγουν την οψωνινοποίηση απο τις λιποπρωτεϊνες του αίματος, την επίθεση απο τα φαγοκύτταρα του Δικτυοενδοθηλιακού συστήματος (RES) καθώς και την ταχεία νεφρική κάθαρση, με αποτέλεσμα την παρατεταμένη κυκλοφορία τους στο αίμα (stealth systems) και την εκλεκτική πρόσληψη τους απο τους συμπαγείς καρκινικούς όγκους, μέσω του φαινομένου της ενισχυμένης διαπερατότητας και κατακράτησης (EPR effect). Οι ιδιότητες αυτές, καθιστούν τα συγκεκριμένα συστήματα πολύτιμα εργαλεία στον τομέα της νανοϊατρικής.
Η παρούσα μεταπτυχιακή διατριβή πραγματεύεται τη σύνθεση υδρόφοβων SPIONs μέσω της τεχνικής της θερμικής αποικοδόμησης. Μελετήθηκαν οι συνθετικές παράμετροι (πρόδρομη ένωση, ποσότητα ελαϊκού οξέος, θερμοκρασία και διάρκεια αντίδρασης, ρυθμός αύξησης της θερμοκρασίας κ.α) που επηρεάζουν το μέγεθος, το σχήμα και τη διασπορά του μεγέθους των σχηματιζομένων νανοκρυσταλλιτών (5-13nm, σ: 10-20%), καθώς διαδραματίζουν σημαντικό ρόλο στη μαγνητική συμπεριφορά των υβριδικών νανονοφορέων. Στη συνέχεια, πραγματοποιήθηκε σύνθεση υβριδικών νανοφορέων με εγκλωβισμό των SPIONs σε πολυμερικά μικκύλια. Η παρασκευή των υπερπαραμαγνητικών μικκυλίων επιτελέστηκε με την τεχνικη solvent diffusion and evaporation (nanoprecipitation), με χρήση του αμφίφιλου συμπολυμερούς πολυ(γαλακτικό οξύ)-πολυ(αιθυλενογλυκόλη) (PLA-PEG). Στον υδρόφοβο πυρήνα των μικκυλίων (PLA) δεσμεύονται υδρόφοβες ενώσεις (PTX, SPIONs), ενώ το υδρόφιλο κέλυφος (PEG) προσδίδει κολλοειδή σταθερότητα σε υδατικά μέσα (δομή πυρήνα-κελύφους). Διερευνήθηκαν διάφορες συνθετικές παράμετροι (μοριακό βάρος συμπολυμερούς, ποσότητα SPIONs, ρυθμός προσθήκης οργανικής φάσης κ.α) και προσδιορίστηκαν οι βέλτιστες συνθήκες για την παρασκευή υπερπαραμαγνητικών μικκυλίων μεγέθους…
Advisors/Committee Members: Αυγουστάκης, Κωνσταντίνος, Sergides, Andreas, Αυγουστάκης, Κωνσταντίνος, Κλεπετσάνης, Παύλος, Μπακανδρίτσος, Αριστείδης.
Subjects/Keywords: Συστήματα ελεγχόμενης χορήγησης φαρμάκων (DDS); Υπερπαραμαγνητικοί νανοκρυσταλλίτες οξειδίου του σιδήρου (SPIONs); Πακλιταξέλη; Φαινόμενο ενισχυμένης διαπερατότητας και κατακράτησης (EPR); Απεικόνιση μαγνητικού συντονισμού (MRI); Υπερθερμία μαγνητικών ρευστών; Εναλλασσόμενο μαγνητικό πεδίο; Μαγνητική στόχευση φαρμάκων; Φόρτωση φαρμάκου (D.L); Απόδοση ενκαψυλίωσης φαρμάκου (D.E.E); Μαγνητική φόρτωση (M.L); Απόδοση μαγνητικής ενκαψυλίωσης (M.E.E); Απόδοση σχηματισμού μικκυλίων (M.F.E); Υδροδυναμική διάμετρος (Dh); Πολυμερικά μικκύλια; Μαγνητοφόρηση; 616.994 061 072 4; Drug delivery systems (DDS); Superparamagnetic iron oxide nanocrystals (SPIONs); Paclitaxel; PLA-PEG; Enhanced permeabilty and retention effect (EPR); Magnetic resonance imaging (MRI); Magnetic fluid hyperthermia; Alternating magnetic field; Magnetic drug targeting; Drug loading (D.L); Drug encapsulation efficiency (D.E.E); Magnetic loading (M.L); Magnetic encapsulation efficiency (M.E.E); Micelles formation efficiency (M.F.E); Hydrodynamic diameter (Dh); Polymeric micelles; Magnetophoresis; Triggered drug release
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APA (6th Edition):
Σεργίδης, . (2014). Μελέτη των παραμέτρων της σύνθεσης υβριδικών κολλοειδών νανοκρυστάλλων με υπερπαραμαγνητικές ιδιότητες για την ανάπτυξη πολυλειτουργικών συστημάτων ελεγχόμενης χορήγησης αντικαρκινικών ουσιών. (Masters Thesis). University of Patras. Retrieved from http://hdl.handle.net/10889/8576
Chicago Manual of Style (16th Edition):
Σεργίδης, Ανδρέας. “Μελέτη των παραμέτρων της σύνθεσης υβριδικών κολλοειδών νανοκρυστάλλων με υπερπαραμαγνητικές ιδιότητες για την ανάπτυξη πολυλειτουργικών συστημάτων ελεγχόμενης χορήγησης αντικαρκινικών ουσιών.” 2014. Masters Thesis, University of Patras. Accessed January 18, 2021.
http://hdl.handle.net/10889/8576.
MLA Handbook (7th Edition):
Σεργίδης, Ανδρέας. “Μελέτη των παραμέτρων της σύνθεσης υβριδικών κολλοειδών νανοκρυστάλλων με υπερπαραμαγνητικές ιδιότητες για την ανάπτυξη πολυλειτουργικών συστημάτων ελεγχόμενης χορήγησης αντικαρκινικών ουσιών.” 2014. Web. 18 Jan 2021.
Vancouver:
Σεργίδης . Μελέτη των παραμέτρων της σύνθεσης υβριδικών κολλοειδών νανοκρυστάλλων με υπερπαραμαγνητικές ιδιότητες για την ανάπτυξη πολυλειτουργικών συστημάτων ελεγχόμενης χορήγησης αντικαρκινικών ουσιών. [Internet] [Masters thesis]. University of Patras; 2014. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/10889/8576.
Council of Science Editors:
Σεργίδης . Μελέτη των παραμέτρων της σύνθεσης υβριδικών κολλοειδών νανοκρυστάλλων με υπερπαραμαγνητικές ιδιότητες για την ανάπτυξη πολυλειτουργικών συστημάτων ελεγχόμενης χορήγησης αντικαρκινικών ουσιών. [Masters Thesis]. University of Patras; 2014. Available from: http://hdl.handle.net/10889/8576
27.
Daniel Henrique Rodrigues.
Estudo das propriedades ópticas e estruturais de nanocristais de MnTe em vidros óxidos.
Degree: 2006, Federal University of Uberlândia
URL: http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=708
;
http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=709
► Nanoestruturas baseadas em Semicondutores Magnéticos Diluídos (DMS), também denominado semicondutor semimagnético, tem despertado o interesse da comunidade científica devido as suas singulares propriedades magneto-ópticas e…
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▼ Nanoestruturas baseadas em Semicondutores Magnéticos Diluídos (DMS), também denominado semicondutor semimagnético, tem despertado o interesse da comunidade científica devido as suas singulares propriedades magneto-ópticas e de transporte. Recentemente, foi estudada possibilidade de manipulação de um único spin em nanocristais DMS, tornando-os um problema físico interessante e com possíveis aplicações no campo da spintrônica. As nanoestruturas baseadas em compostos semicondutores do tipo Pb1-xMnxTe, Ga1-xMnxTe e Cd1-xMnxTe são de particular interesse, em que uma análise das propriedades magnéticas e ópticas dos materiais base CdTe e MnTe é indispensável para um estudo mais rigoroso do sistema Cd1-xMnxTe, por exemplo. O CdTe é um sistema binário não-magnético cujas propriedades tem sido bastante analisadas e discutidas na literatura. Por outro lado, estudos sobre as propriedades do composto MnTe e suas nanoestruturas são escassos ou pouco detalhados. A falta de informação é particularmente crítica no caso de nanocristais ou pontos quânticos baseados em MnTe, devido, principalmente, as dificuldades na aplicação de técnicas e processos de crescimento. Relata-se nessa dissertação de mestrado, pela primeira vez, a síntese de nanocristais de MnTe em vidros óxidos, isto é, na matriz vítrea SNAB (SiO2-Na2CO3-Al2O3-B2O3) utilizando o método de fusão. Estes nanocristais produzidos foram caracterizados por medidas de Absorção Óptica (AO), Fotoluminescência (PL), Microscopia de Força Atômica (AFM), Espectroscopia micro-Raman (EmR), Ressonância Paramagnética Eletrônica (RPE), Espectroscopia de Absorção de raios-X e o método K.p. Os resultados comprovam a formação dos nanocristais de MnTe na matriz vítrea SNAB pelo método de fusão.
Nanostructures based in Diluted Magnetic Semiconductors (DMS) - also referred as semimagnetic semiconductors have recently been attracting the interest of the scientific community due to its unique magneto-optical and transport properties. The possibility of manipulating single spins in DMS nanocrystals has recently been studied, making them an interesting physical problem with possible applications in the new field of spintronics. The nanostructures based on semiconductor compounds of the Pb1-xMnxTe, Ga1-xMnxTe and Cd1-xMnxTe type are particularly interesting. For a more accurate study of these compounds, for example, Cd1-xMnxTe an analysis of the magnetic and optical properties of CdTe and MnTe is indispensable. The CdTe is a non-magnetic binary system whose properties have been sufficiently analyzed and argued in literature. On the other hand, studies on the properties of the MnTe compound and its nanostructures are scarce or not satisfactorily detailed. The lack of information is particularly critical in the case of nanocrystals based in MnTe, owing to the difficulties in applying the techniques and in the growing process. This work report the first successfully growth of MnTe nanocrystals synthesized in a glass matrix SNAB (SiO2-Na2CO3-Al2O3-B2O3) using the fusion method. Measurements of Optical…
Advisors/Committee Members: Noelio Oliveira Dantas, Jose Candido Xavier, Yara Galvão Gobato, Augusto Miguel Alcalde Milla.
Subjects/Keywords: Método de fusão; Nanocristais semimagnéticos de MnTe; Caracterização; Absorção óptica; Fotoluminescência; Microscopia de força atômica; Micro-raman; Ressonância paramagnética eletrônica; Absorção de raios-x; Método K.p; FISICA; Magnetic materials and semiconducting materials; Nanocrystals of MnTe; Melting method; Characterization; Optical absorption; Síntese; Photoluminescence; Raman spectroscopy; Electronic paramagnetic resonance; Atomic force microscopy; X-ray; Absorption spectroscopy (XAS); K.p method
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Record Details
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APA ·
Chicago ·
MLA ·
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APA (6th Edition):
Rodrigues, D. H. (2006). Estudo das propriedades ópticas e estruturais de nanocristais de MnTe em vidros óxidos. (Thesis). Federal University of Uberlândia. Retrieved from http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=708 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=709
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rodrigues, Daniel Henrique. “Estudo das propriedades ópticas e estruturais de nanocristais de MnTe em vidros óxidos.” 2006. Thesis, Federal University of Uberlândia. Accessed January 18, 2021.
http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=708 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=709.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rodrigues, Daniel Henrique. “Estudo das propriedades ópticas e estruturais de nanocristais de MnTe em vidros óxidos.” 2006. Web. 18 Jan 2021.
Vancouver:
Rodrigues DH. Estudo das propriedades ópticas e estruturais de nanocristais de MnTe em vidros óxidos. [Internet] [Thesis]. Federal University of Uberlândia; 2006. [cited 2021 Jan 18].
Available from: http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=708 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=709.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rodrigues DH. Estudo das propriedades ópticas e estruturais de nanocristais de MnTe em vidros óxidos. [Thesis]. Federal University of Uberlândia; 2006. Available from: http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=708 ; http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=709
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
. 
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