subject:(photoinduced)

University of Saskatchewan

1. Kowalyshen, Matthew. Photoinduced dichroism in amorphous As2Se3 thin films.

Degree: 2010, University of Saskatchewan

URL: http://hdl.handle.net/10388/etd-08082010-150345

► The dichroism induced by a polarized beam of near bandgap light was measured in thin films of amorphous As2Se3. The polarized pump-beam causes a decrease… (more)

▼ The dichroism induced by a polarized beam of near bandgap light was measured in thin films of amorphous As2Se3. The polarized pump-beam causes a decrease in the absorption coefficient for light polarized in the same direction, and the resulting anisotropy in absorption coefficients is referred to as dichroism. An unpolarized beam of light passing through the sample will be preferentially absorbed in the same direction as the pump-beam polarization direction. That preferential absorption can be measured as a function of time to represent the time dependence of the induced dichroism. The time dependence of the induced dichroism follows a stretched exponential of the form exp((-t/ô)^â). Three parameters from the fitting function are of interest; the saturation level Asat, the time constant ô, and the stretching exponent â. The kinetics of dichroism were extracted from measurements on samples of various thicknesses, samples subjected to various pump-beam intensities, samples doped with small quantities of iodine (0.1%), and for samples in the presence of a DC electric field. It was found that the induced dichroism saturates at a value that depends linearly on sample thickness, but is independent of inducing beam intensity. The time constant (ô) was found to have an inverse relationship with pump-beam intensity and decreases with increasing sample thickness. The stretching exponent â has little or no dependence on either intensity or thickness. The addition of iodine (0.1%) increased the time constant (ô) in some but not all cases; meanwhile the DC electric field had no effect on any of the fitting parameters. Measurement of the kinetics of the induced dichroism in amorphous As2Se3 can be used to constrain models of the phenomenon in Chalcogenide glasses. The results of the intensity dependence study fit well within the framework of the current theoretical models; however, the iodine doping and electric field measurements do not. The model predicts a decrease in the rate for samples doped with iodine, and those subjected to a transverse electric field; neither effects were observed. Providing a framework for photoinduced dichroism is important if device level applications are to be realized using the effect. In order for any material to be used in commercially viable applications it needs to be cheap and easy to produce; and it needs to be completely described from an optical and electrical standpoint. A better understanding of photoinduced dichroism in amorphous As2Se3 may lead to the realization of optical switches, optical memory, polarizers, waveguides, and diffraction gratings. Advisors/Committee Members: Kasap, S.O., Johanson, Robert, Klymyshyn, David, Karki, Rajesh, Bourassa, A..

Subjects/Keywords: photoinduced; As2Se3; dichroism

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APA (6^th Edition):

Kowalyshen, M. (2010). Photoinduced dichroism in amorphous As2Se3 thin films. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-08082010-150345

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kowalyshen, Matthew. “Photoinduced dichroism in amorphous As2Se3 thin films.” 2010. Thesis, University of Saskatchewan. Accessed December 12, 2019. http://hdl.handle.net/10388/etd-08082010-150345.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kowalyshen, Matthew. “Photoinduced dichroism in amorphous As2Se3 thin films.” 2010. Web. 12 Dec 2019.

Vancouver:

Kowalyshen M. Photoinduced dichroism in amorphous As2Se3 thin films. [Internet] [Thesis]. University of Saskatchewan; 2010. [cited 2019 Dec 12]. Available from: http://hdl.handle.net/10388/etd-08082010-150345.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kowalyshen M. Photoinduced dichroism in amorphous As2Se3 thin films. [Thesis]. University of Saskatchewan; 2010. Available from: http://hdl.handle.net/10388/etd-08082010-150345

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of North Texas

2. Bodenstedt, Kurt. Synthesis and Electron Transfer Studies of Supramolecular Triads.

Degree: 2016, University of North Texas

URL: https://digital.library.unt.edu/ark:/67531/metadc849639/

► This study expands the role of polythiophenes as an electron donating chromophore within energy harvesting milti-modular donor-acceptor systems. The polythiophene moiety would act as an… (more)

Subjects/Keywords: polythiophene; photoinduced electron transfer

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APA (6^th Edition):

Bodenstedt, K. (2016). Synthesis and Electron Transfer Studies of Supramolecular Triads. (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc849639/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bodenstedt, Kurt. “Synthesis and Electron Transfer Studies of Supramolecular Triads.” 2016. Thesis, University of North Texas. Accessed December 12, 2019. https://digital.library.unt.edu/ark:/67531/metadc849639/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bodenstedt, Kurt. “Synthesis and Electron Transfer Studies of Supramolecular Triads.” 2016. Web. 12 Dec 2019.

Vancouver:

Bodenstedt K. Synthesis and Electron Transfer Studies of Supramolecular Triads. [Internet] [Thesis]. University of North Texas; 2016. [cited 2019 Dec 12]. Available from: https://digital.library.unt.edu/ark:/67531/metadc849639/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bodenstedt K. Synthesis and Electron Transfer Studies of Supramolecular Triads. [Thesis]. University of North Texas; 2016. Available from: https://digital.library.unt.edu/ark:/67531/metadc849639/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Université de Neuchâtel

3. Baumann, Esther. Near infrared intersubband absorption and photovoltaic detection in GaN/AIN multi quantum well structures.

Degree: 2007, Université de Neuchâtel

URL: http://doc.rero.ch/record/8141

► Due to the large conduction band offset of nearly 2 eV between GaN and AlN, group III nitride semiconductor heterostructures are of great interest for… (more)

Subjects/Keywords: Photoinduced polarization

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APA (6^th Edition):

Baumann, E. (2007). Near infrared intersubband absorption and photovoltaic detection in GaN/AIN multi quantum well structures. (Thesis). Université de Neuchâtel. Retrieved from http://doc.rero.ch/record/8141

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Baumann, Esther. “Near infrared intersubband absorption and photovoltaic detection in GaN/AIN multi quantum well structures.” 2007. Thesis, Université de Neuchâtel. Accessed December 12, 2019. http://doc.rero.ch/record/8141.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Baumann, Esther. “Near infrared intersubband absorption and photovoltaic detection in GaN/AIN multi quantum well structures.” 2007. Web. 12 Dec 2019.

Vancouver:

Baumann E. Near infrared intersubband absorption and photovoltaic detection in GaN/AIN multi quantum well structures. [Internet] [Thesis]. Université de Neuchâtel; 2007. [cited 2019 Dec 12]. Available from: http://doc.rero.ch/record/8141.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Baumann E. Near infrared intersubband absorption and photovoltaic detection in GaN/AIN multi quantum well structures. [Thesis]. Université de Neuchâtel; 2007. Available from: http://doc.rero.ch/record/8141

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

4. Suneesh, C V. Phenylethynylarene Based Donor-Acceptor Systems: Design, Synthesis and Photophysical Studies.

Degree: 2010, Cochin University of Science and Technology

URL: http://dyuthi.cusat.ac.in/purl/3128

►

This thesis Entitled phenylethynylarene based Donor-Acceptor systems:Desigh,Synthesis and Photophysical studies. A strategy for the design of donor-acceptor dyads, wherein decay of the charge separated (CS)… (more)

Subjects/Keywords: Donor-Acceptor; Photoinduced electron transfer; Photoinduced CS in Molecular system; D-A molecular dyads; D-A molecular dyads

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APA (6^th Edition):

Suneesh, C. V. (2010). Phenylethynylarene Based Donor-Acceptor Systems: Design, Synthesis and Photophysical Studies. (Thesis). Cochin University of Science and Technology. Retrieved from http://dyuthi.cusat.ac.in/purl/3128

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Suneesh, C V. “Phenylethynylarene Based Donor-Acceptor Systems: Design, Synthesis and Photophysical Studies.” 2010. Thesis, Cochin University of Science and Technology. Accessed December 12, 2019. http://dyuthi.cusat.ac.in/purl/3128.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Suneesh, C V. “Phenylethynylarene Based Donor-Acceptor Systems: Design, Synthesis and Photophysical Studies.” 2010. Web. 12 Dec 2019.

Vancouver:

Suneesh CV. Phenylethynylarene Based Donor-Acceptor Systems: Design, Synthesis and Photophysical Studies. [Internet] [Thesis]. Cochin University of Science and Technology; 2010. [cited 2019 Dec 12]. Available from: http://dyuthi.cusat.ac.in/purl/3128.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Suneesh CV. Phenylethynylarene Based Donor-Acceptor Systems: Design, Synthesis and Photophysical Studies. [Thesis]. Cochin University of Science and Technology; 2010. Available from: http://dyuthi.cusat.ac.in/purl/3128

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

5. Myers, Carl Philip. AMINOETHYLGLYCINE-DERIVATIZED RUTHENIUM COMPLEXES:.

Degree: PhD, Chemistry, 2010, Penn State University

URL: https://etda.libraries.psu.edu/catalog/11639

► Transition metal coordination chemistry and amide peptide coupling chemistry can be exploited to synthesize a wide variety of compounds with ever increasing complexity. Employing these… (more)

▼ Transition metal coordination chemistry and amide peptide coupling chemistry can be exploited to synthesize a wide variety of compounds with ever increasing complexity. Employing these methodologies in the field of artificial photosynthesis could be a tractable solution to the often difficult synthetic challenge of linking donors and acceptors together in a systematic fashion. Successful application of these techniques would provide a wide ranging library of metals and ligands to fine tune compounds by which excited state energy or electrons may be passed from one complex to another, ultimately to do work, e.g. catalyze a reaction. This thesis describes the design and synthesis of peptide sequences capable of binding transition metal ions to self-assemble heterometallic complexes and the resulting photophysical effects of that complexation. Tris(bipyridine)ruthenium(II) complexes were derivatized with aminoethylglycine (aeg) backbones that are arranged in a “hairpin” configuration. Pendant bipyridine (bpy) ligands are complementary to each other and addition of transition metal ions (copper (II), zinc (II), or palladium (II)) form [M(bpy)2]2+ complex(es) through intra-molecular ligand coordination. Peptide coupling chemistry was used to design and synthesize sequences that bind solution metals in a predetermined fashion. To accomplish this, advances in peptide coupling techniques were improved greatly through application of solution phase syntheses that produced gram scale quantities of di-and tri-peptides, a significant advancement over milligram scale yields through solid-phase supported syntheses. Metal binding of Cu2+ ions was measured through fluorescence quenching measurements (steady state and transient) that indicated stoichiometric metal binding to the peptide scaffolds. Through peptide coupling chemistry, we successfully increased the donor-acceptor (Ru-Cu) distance to provide information as to whether energy or electron transfer dominated the emission quenching event. To answer unexpected observations of [Ru(bpy)3]2+ quenching by Zn2+, the effects of metal ion binding on the peptide scaffold and [Ru(bpy)3]2+ were measured through NMR spectroscopy. The Ru-hairpin structure was assigned using two-dimensional NMR techniques and indicated two major conformations at room temperature in dimethylsulfoxide solutions thus complicating the spectra. A model compound was synthesized excluding sources of hindered rotation to paint a clearer picture and the effect of Zn2+ binding was measured through NMR titrations that indicated a significant change in chemical environment of Ru-coordinated bpy ligands. An advantage of [Ru(bpy)3]2+ complexes is bpy ligands maybe be charged with a varying number of reactive acyl chloride groups. Reaction of these with amine-terminated peptides can easily increase the number of aeg strands. To demonstrate this, the number of hairpins was also increased from one to two or three placing [Ru(bpy)3]2+ at the center of a multimetallic complex and imparting metal coordination in three…

Subjects/Keywords: photoinduced energy transfer; photoinduced electron transfer; peptide coupling chemistry; metal complex coordination chemistry; heterometallic; self-assembly; photocatalysis

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APA (6^th Edition):

Myers, C. P. (2010). AMINOETHYLGLYCINE-DERIVATIZED RUTHENIUM COMPLEXES:. (Doctoral Dissertation). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/11639

Chicago Manual of Style (16^th Edition):

Myers, Carl Philip. “AMINOETHYLGLYCINE-DERIVATIZED RUTHENIUM COMPLEXES:.” 2010. Doctoral Dissertation, Penn State University. Accessed December 12, 2019. https://etda.libraries.psu.edu/catalog/11639.

MLA Handbook (7^th Edition):

Myers, Carl Philip. “AMINOETHYLGLYCINE-DERIVATIZED RUTHENIUM COMPLEXES:.” 2010. Web. 12 Dec 2019.

Vancouver:

Myers CP. AMINOETHYLGLYCINE-DERIVATIZED RUTHENIUM COMPLEXES:. [Internet] [Doctoral dissertation]. Penn State University; 2010. [cited 2019 Dec 12]. Available from: https://etda.libraries.psu.edu/catalog/11639.

Council of Science Editors:

Myers CP. AMINOETHYLGLYCINE-DERIVATIZED RUTHENIUM COMPLEXES:. [Doctoral Dissertation]. Penn State University; 2010. Available from: https://etda.libraries.psu.edu/catalog/11639

6. Hari Sankar, B. Fluorescent Probes: synthesis and Investigation of their use in Recognition of Anions and Cations and Biomolecules.

Degree: 2015, Cochin University of Science and Technology

URL: http://dyuthi.cusat.ac.in/purl/5150

► Development of molecular probes for the selective and sensitive detection of analytes has been an active area of research because such effective molecules can have… (more)

Subjects/Keywords: ORGANIC FLUORESCENT PROBES; Fluorescence Detection; Photoinduced Electron Transfer

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APA (6^th Edition):

Hari Sankar, B. (2015). Fluorescent Probes: synthesis and Investigation of their use in Recognition of Anions and Cations and Biomolecules. (Thesis). Cochin University of Science and Technology. Retrieved from http://dyuthi.cusat.ac.in/purl/5150

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hari Sankar, B. “Fluorescent Probes: synthesis and Investigation of their use in Recognition of Anions and Cations and Biomolecules.” 2015. Thesis, Cochin University of Science and Technology. Accessed December 12, 2019. http://dyuthi.cusat.ac.in/purl/5150.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hari Sankar, B. “Fluorescent Probes: synthesis and Investigation of their use in Recognition of Anions and Cations and Biomolecules.” 2015. Web. 12 Dec 2019.

Vancouver:

Hari Sankar B. Fluorescent Probes: synthesis and Investigation of their use in Recognition of Anions and Cations and Biomolecules. [Internet] [Thesis]. Cochin University of Science and Technology; 2015. [cited 2019 Dec 12]. Available from: http://dyuthi.cusat.ac.in/purl/5150.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hari Sankar B. Fluorescent Probes: synthesis and Investigation of their use in Recognition of Anions and Cations and Biomolecules. [Thesis]. Cochin University of Science and Technology; 2015. Available from: http://dyuthi.cusat.ac.in/purl/5150

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Utah

7. Gautam, Bhoj Raj. Magnetic field effect in organic films and devices.

Degree: PhD, Physics & Astronomy, 2013, University of Utah

URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/2517/rec/1502

► In this work, we focused on the magnetic field effect in organic films and devices, including organic light emitting diodes (OLEDs) and organic photovoltaic (OPV)… (more)

▼ In this work, we focused on the magnetic field effect in organic films and devices, including organic light emitting diodes (OLEDs) and organic photovoltaic (OPV) cells.We measured magnetic field effect (MFE) such as magnetoconductance (MC) and magneto-electroluminescence (MEL) in OLEDs based on several π-conjugated polymers and small molecules for fields B∼2mT. Magnetic field effect (MFE) measured on three isotopes of Poly (dioctyloxy) phenylenevinylene (DOO-PPV) showed that both regular and ultra-small effects are isotope dependent. This indicates that MFE response in OLED is mainly due to the hyperfine interaction (HFI).We also performed spectroscopy of the MFE including magneto-photoinduced absorption (MPA) and magneto-photoluminescence (MPL) at steady state conditions in several systems. This includes pristine Poly[2-methoxy-5-(2-ethylhexyl-oxy)-1,4-phenylene-vinylene] (MEH-PPV) films, MEH-PPV films subjected to prolonged illumination, and MEH-PPV/[6,6]-Phenyl C61 butyric acid methyl ester (PCBM) blend, as well as annealed and pristine C60 thin films. For comparison, we also measured MC and MEL in organic diodes based on the same materials. By directly comparing the MPA and MPL responses in films to MC and MEL in organic diodes based on the same active layers, we are able to relate the MFE in organic diodes to the spin densities of theexcitations formed in the device, regardless of whether they are formed by photon absorption or carrier injection from the electrodes.We also studied magneto-photocurrent (MPC) and power conversion efficiency (PCE) of a 'standard' Poly (3-hexylthiophene)/PCBM device at various Galvinoxyl radical wt%. We found that the MPC reduction with Galvinoxyl wt% follows the same trend as that of the PCE enhancement. In addition, we also measured the MPC response of a series of OPV cells. We attribute the observed broad MPC to short-lived charge transfer complex species, where spin mixing is caused by the difference, Δg of the donor/acceptor g factors; whereas narrow MPC is due to HFI within long-lived polaron-pairs.

Subjects/Keywords: Electroluminescence; Hyperfine; Magneto-resistance; Photocurrent; Photoinduced absorption; Polaron pair

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APA (6^th Edition):

Gautam, B. R. (2013). Magnetic field effect in organic films and devices. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/2517/rec/1502

Chicago Manual of Style (16^th Edition):

Gautam, Bhoj Raj. “Magnetic field effect in organic films and devices.” 2013. Doctoral Dissertation, University of Utah. Accessed December 12, 2019. http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/2517/rec/1502.

MLA Handbook (7^th Edition):

Gautam, Bhoj Raj. “Magnetic field effect in organic films and devices.” 2013. Web. 12 Dec 2019.

Vancouver:

Gautam BR. Magnetic field effect in organic films and devices. [Internet] [Doctoral dissertation]. University of Utah; 2013. [cited 2019 Dec 12]. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/2517/rec/1502.

Council of Science Editors:

Gautam BR. Magnetic field effect in organic films and devices. [Doctoral Dissertation]. University of Utah; 2013. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/2517/rec/1502

The Ohio State University

8. Sears, R. Bryan. Photochemical and Spectroscopic Studies of Ru(II) Complexes as Potential Photodynamic Therapy Agents.

Degree: PhD, Chemistry, 2010, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1290443063

► Cisplatin is an anticancer drug used in the treatment of various cancers. However, cisplatin is toxic towards both healthy and tumor cells alike, resulting… (more)

Subjects/Keywords: Chemistry; Ru(II) Complexes; Photochemistry; Photodynamic Therapy; Photoinduced Ligand Exchange

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APA (6^th Edition):

Sears, R. B. (2010). Photochemical and Spectroscopic Studies of Ru(II) Complexes as Potential Photodynamic Therapy Agents. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1290443063

Chicago Manual of Style (16^th Edition):

Sears, R Bryan. “Photochemical and Spectroscopic Studies of Ru(II) Complexes as Potential Photodynamic Therapy Agents.” 2010. Doctoral Dissertation, The Ohio State University. Accessed December 12, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1290443063.

MLA Handbook (7^th Edition):

Sears, R Bryan. “Photochemical and Spectroscopic Studies of Ru(II) Complexes as Potential Photodynamic Therapy Agents.” 2010. Web. 12 Dec 2019.

Vancouver:

Sears RB. Photochemical and Spectroscopic Studies of Ru(II) Complexes as Potential Photodynamic Therapy Agents. [Internet] [Doctoral dissertation]. The Ohio State University; 2010. [cited 2019 Dec 12]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1290443063.

Council of Science Editors:

Sears RB. Photochemical and Spectroscopic Studies of Ru(II) Complexes as Potential Photodynamic Therapy Agents. [Doctoral Dissertation]. The Ohio State University; 2010. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1290443063

The Ohio State University

9. Chen, Chia-Yi. Chemically Tailored Organic-Based Magnets to Exploit Optical Control of Magnetization and Depth-Resolved Magnetization in V[TCNE]_x~2 via Polarized Neutron Reflectivity.

Degree: PhD, Chemical Physics, 2010, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1293405276

► Organic-based magnets have attracted much attention in recent decades as numerous benefits of this class of materials have been touted. In particular, chemical tailorability… (more)

▼ Organic-based magnets have attracted much attention in recent decades as numerous benefits of this class of materials have been touted. In particular, chemical tailorability and potential use in practical applications paint a promising picture for the future of organic-based magnets in the field of spintronics. In the first part of this work, chemically tailoring organic-based magnets with optical-controllable functionality is realized through modifying organic molecules with azo functional groups. Two new optical-switchable electron acceptors, 3,3’-di-(1,1,2-tricyanovinyl)azobenzene (DTCVAzo) and 3,-(1,1,2-tricyanovinyl)azobenzene (TCVAzo), were synthesized and characterized. Their associated organic-based magnets prepared from reaction with V(CO)₆ exhibit magnetic ordering below 60 and 126 K, respectively. At low temperatures the magnetization of both magnets decreases upon illumination with UV light whereas no change in magnetization is observed with subsequent visible light irradiation. The reduced magnetization is a long-lived metastable state in the dark and at low temperatures (> 10⁶ s at 15 K) but can be fully recovered by thermal treatment above 240 K. A further study was extended to a solid solution magnet prepared from the reaction of V(CO)₆ and a mixture of tetracyanoethylene (TCNE) and TCVAzo. An interesting multi-step photomagnetic response is observed in the solid solution at low temperatures with the illumination of UV or visible light. The correlation between the photoinduced magnetization of the organic-based magnets and the photoisomerization of the azo functional groups was studied by UV-Vis absorption spectroscopy. The results suggest the photomagnetic effects are due to structural changes driven by the photoisomerization of the azo functional groups, leading to a different strength of magnetic exchange coupling. The second focus of this work is to characterize the depth-resolved magnetization of thin films of the organic-based magnet, V[TCNE]_x~2. Practical application of this material has been realized in spintronic devices, thus it is important to fully understand the chemical and magnetic properties throughout the films. Different thicknesses of V[TCNE]_x~2 films prepared by chemical vapor deposition (CVD) were studied. Their bulk magnetizations show a thickness dependence at low magnetic field, suggesting stronger random magnetic anisotropy is present in the thicker film; however, this phenomenon disappears at sufficiently high fields. The depth profiles from polarized neutron reflectivity studies exhibit two sublayers in V[TCNE]_x~2 film, which is ascribed to partial oxidation occurring in the top portion of the layer. Detailed analysis suggests the chemical and magnetic properties of V[TCNE]_x~2 are homogeneous throughout the thickness of the film if there is no oxygen contamination. Advisors/Committee Members: Epstein, Arthur (Advisor).

Subjects/Keywords: Chemistry; organic-based magnet; photoinduced magnetism; polarized neutron reflectivity

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APA (6^th Edition):

Chen, C. (2010). Chemically Tailored Organic-Based Magnets to Exploit Optical Control of Magnetization and Depth-Resolved Magnetization in V[TCNE]_x~2 via Polarized Neutron Reflectivity. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1293405276

Chicago Manual of Style (16^th Edition):

Chen, Chia-Yi. “Chemically Tailored Organic-Based Magnets to Exploit Optical Control of Magnetization and Depth-Resolved Magnetization in V[TCNE]_x~2 via Polarized Neutron Reflectivity.” 2010. Doctoral Dissertation, The Ohio State University. Accessed December 12, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1293405276.

MLA Handbook (7^th Edition):

Chen, Chia-Yi. “Chemically Tailored Organic-Based Magnets to Exploit Optical Control of Magnetization and Depth-Resolved Magnetization in V[TCNE]_x~2 via Polarized Neutron Reflectivity.” 2010. Web. 12 Dec 2019.

Vancouver:

Chen C. Chemically Tailored Organic-Based Magnets to Exploit Optical Control of Magnetization and Depth-Resolved Magnetization in V[TCNE]_x~2 via Polarized Neutron Reflectivity. [Internet] [Doctoral dissertation]. The Ohio State University; 2010. [cited 2019 Dec 12]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1293405276.

Council of Science Editors:

Chen C. Chemically Tailored Organic-Based Magnets to Exploit Optical Control of Magnetization and Depth-Resolved Magnetization in V[TCNE]_x~2 via Polarized Neutron Reflectivity. [Doctoral Dissertation]. The Ohio State University; 2010. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1293405276

NSYSU

10. Chang, Heng-Kai. Light-driven, multistable and full-color reflective blue phase liquid crystal display.

Degree: Master, Electro-Optical Engineering, 2013, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0630113-111139

► Blue phase(BP) is a mesophase existed at temperature range between cholesteric phase and isotropic phase. BP can be classified into BP I and BP II… (more)

Subjects/Keywords: full-color reflective display; 4MAB; trans-cis isomerization; photoinduced; blue phase

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APA (6^th Edition):

Chang, H. (2013). Light-driven, multistable and full-color reflective blue phase liquid crystal display. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0630113-111139

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chang, Heng-Kai. “Light-driven, multistable and full-color reflective blue phase liquid crystal display.” 2013. Thesis, NSYSU. Accessed December 12, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0630113-111139.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chang, Heng-Kai. “Light-driven, multistable and full-color reflective blue phase liquid crystal display.” 2013. Web. 12 Dec 2019.

Vancouver:

Chang H. Light-driven, multistable and full-color reflective blue phase liquid crystal display. [Internet] [Thesis]. NSYSU; 2013. [cited 2019 Dec 12]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0630113-111139.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chang H. Light-driven, multistable and full-color reflective blue phase liquid crystal display. [Thesis]. NSYSU; 2013. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0630113-111139

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Louisiana State University

11. Silvers, William. Design and Analysis of Cloaked Fluorophores for Rapid Detection and Visualization of Cancer Cells Containing NAD(P)H:Quinone Oxidoreductase-1.

Degree: PhD, Chemistry, 2012, Louisiana State University

URL: etd-09242012-121250 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3974

► The development of fluorogenic substrates for real-time tumor cell detection has led to a vastly expanding field for personal oncology. Fluorophores have been studied as… (more)

▼ The development of fluorogenic substrates for real-time tumor cell detection has led to a vastly expanding field for personal oncology. Fluorophores have been studied as appendages to larger scaffolds leading to accumulation of these dyes in tumor cells or their surrounding environment, taking advantage of tumor anatomy. A new class of fluorophores has been developed in which the dye is an active participant in the mechanism of cancer cell detection. These dyes have been conjugated such that their fluorescence has been eliminated or altered and will undergo a change to reveal their fluorescent signal upon activation by a mechanism that is unique to tumor cells. The research presented in this dissertation encompasses the design, synthesis, properties, and utilization of latent fluorophores that are specifically activated by an enzyme that is highly upregulated in tumor cells, NAD(P)H:quinone oxidoreductase-1 (NQO1). These dyes utilize the 2-electron reduction of quinones to hydroquinones, which NQO1 specifically catalyzes. A dye’s fluorescence can be quenched by conjugating a quinone directly to the fluorophore, only to have its signal uncloaked after activation by NQO1. The objectives in this research will be achieved by: (1) the characterization of properties (stability in biological environments, quantum yields) of the quinone, dyes, and their conjugated counterparts; (2) determination of kinetic parameters (Michaelis constant (Km), theoretical maximum velocity (Vmax), catalytic constant (kcat), enzyme efficiency (kcat/Km) of the substrates towards NQO1 and the way solvent affects such parameters during assay conditions; and (3) utilization of a latent fluorophore for in vivo NQO1 analysis (widefield imaging, confocal single-/two-photon microscopy, flow cytometry) and determining the fate of the released fluorophore. Integration of these studies led to the development of two different latent fluorophores that are readily activated by NQO1. Of these two fluorogenic cancer sensors, one was found to possess a highly novel quenching mechanism between the quinone and the dye.

Subjects/Keywords: NQO1; in vitro imagign; photoinduced electron transfer; latent-fluorophore

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Silvers, W. (2012). Design and Analysis of Cloaked Fluorophores for Rapid Detection and Visualization of Cancer Cells Containing NAD(P)H:Quinone Oxidoreductase-1. (Doctoral Dissertation). Louisiana State University. Retrieved from etd-09242012-121250 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3974

Chicago Manual of Style (16^th Edition):

Silvers, William. “Design and Analysis of Cloaked Fluorophores for Rapid Detection and Visualization of Cancer Cells Containing NAD(P)H:Quinone Oxidoreductase-1.” 2012. Doctoral Dissertation, Louisiana State University. Accessed December 12, 2019. etd-09242012-121250 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3974.

MLA Handbook (7^th Edition):

Silvers, William. “Design and Analysis of Cloaked Fluorophores for Rapid Detection and Visualization of Cancer Cells Containing NAD(P)H:Quinone Oxidoreductase-1.” 2012. Web. 12 Dec 2019.

Vancouver:

Silvers W. Design and Analysis of Cloaked Fluorophores for Rapid Detection and Visualization of Cancer Cells Containing NAD(P)H:Quinone Oxidoreductase-1. [Internet] [Doctoral dissertation]. Louisiana State University; 2012. [cited 2019 Dec 12]. Available from: etd-09242012-121250 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3974.

Council of Science Editors:

Silvers W. Design and Analysis of Cloaked Fluorophores for Rapid Detection and Visualization of Cancer Cells Containing NAD(P)H:Quinone Oxidoreductase-1. [Doctoral Dissertation]. Louisiana State University; 2012. Available from: etd-09242012-121250 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3974

University of California – San Diego

12. Woodford, Clifford Rodereigh. Transducing Voltage Changes in Biological Systems to Fluorescent Signals via Small Molecules Using a Photoinduced Electron Transfer Mechanism.

Degree: Chemistry, 2016, University of California – San Diego

URL: http://www.escholarship.org/uc/item/7c25h4js

► Neuronal networks are responsible for complicated responses to stimuli and behavior. Understanding these networks involves recording the changes in transmembrane electrical potential from small subcellular… (more)

▼ Neuronal networks are responsible for complicated responses to stimuli and behavior. Understanding these networks involves recording the changes in transmembrane electrical potential from small subcellular locations such as dendritic spines, to large networks of neurons. This dissertation represents a concerted effort toward the development of small molecule probes with fluorescent intensities responsive to the transmembrane electrical potential of neurons. Fluorescent voltage sensitive molecules termed VoltageFluors (VF) are capable of undergoing photo-induced electron transfer (PeT). Previous work demonstrated that when embedded within a membrane of interest, the local electric field modulates the extent of PeT, and thus the fluorescence intensity as well. This thesis presents efforts toward rationally improving the voltage sensitivity of VF dyes through tuning the driving force for electron transfer and optimizing the structure of bridges. Optimization led to a significant improvement in voltage sensitivity of newly developed dyes epitomized by VF2.1OMe.H with a 48% ∆F/F per 100 mV demonstrated in HEK cells. This voltage sensor was to record voltage changes across neuronal systems from leech ganglia to mouse brain slices with high fidelity as well.In addition to sensitivity improvements, VF dyes were developed with a Cy5-like acceptor for far red fluorescence imaging in biology, The most sensitive dye in this class, VF Red, showed a 25% ∆F/F per 100 mV in HEK cells and could effectively be used with optical activity activators for all optical stimulation and recording of electrical activity in neurons. Further improvements to recording voltage changes in biological systems included work toward reducing background fluorescence and generating a higher signal to noise ratio by generating non-fluorescent VF dyes by chemical reduction. These molecules were then subjected to selective reoxidation back to fluorescent VF dyes solely where oxidizing protein was present. Both fluorescein and cy5-based VF dyes were shown to undergo a degree of oxidation in vitro upon addition of oxidizing proteins. These efforts represent significant improvements to VF dyes toward improved optical sensor of voltage across many neuronal systems.

Subjects/Keywords: Chemistry; Neurosciences; Fluorescent Probe; Photoinduced electron Transfer; Voltage Sensor

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Woodford, C. R. (2016). Transducing Voltage Changes in Biological Systems to Fluorescent Signals via Small Molecules Using a Photoinduced Electron Transfer Mechanism. (Thesis). University of California – San Diego. Retrieved from http://www.escholarship.org/uc/item/7c25h4js

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Woodford, Clifford Rodereigh. “Transducing Voltage Changes in Biological Systems to Fluorescent Signals via Small Molecules Using a Photoinduced Electron Transfer Mechanism.” 2016. Thesis, University of California – San Diego. Accessed December 12, 2019. http://www.escholarship.org/uc/item/7c25h4js.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Woodford, Clifford Rodereigh. “Transducing Voltage Changes in Biological Systems to Fluorescent Signals via Small Molecules Using a Photoinduced Electron Transfer Mechanism.” 2016. Web. 12 Dec 2019.

Vancouver:

Woodford CR. Transducing Voltage Changes in Biological Systems to Fluorescent Signals via Small Molecules Using a Photoinduced Electron Transfer Mechanism. [Internet] [Thesis]. University of California – San Diego; 2016. [cited 2019 Dec 12]. Available from: http://www.escholarship.org/uc/item/7c25h4js.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Woodford CR. Transducing Voltage Changes in Biological Systems to Fluorescent Signals via Small Molecules Using a Photoinduced Electron Transfer Mechanism. [Thesis]. University of California – San Diego; 2016. Available from: http://www.escholarship.org/uc/item/7c25h4js

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Washington

13. Nagaoka, Hirokazu. Long-lived charge carrier dynamics in polymer/quantum dot blends and organometal halide perovskites.

Degree: PhD, 2015, University of Washington

URL: http://hdl.handle.net/1773/27434

► Solution-processable semiconductors offer a potential route to deploy solar panels on a wide scale, based on the possibility of reduced manufacturing costs by using earth-abundant… (more)

▼ Solution-processable semiconductors offer a potential route to deploy solar panels on a wide scale, based on the possibility of reduced manufacturing costs by using earth-abundant materials and inexpensive production technologies, such as inkjet or roll-to-roll printing. Understanding the fundamental physics underlying device operation is important to realize this goal. This dissertation describes studies of two kinds of solar cells: hybrid polymer/PbS quantum dot solar cells and organometal halide perovskite solar cells. Chapter two discusses details of the experimental techniques. Chapter three and four explore the mechanisms of charge transfer and energy transfer spectroscopically, and find that both processes contribute to the device photocurrent. Chapter four investigates the important question of how the energy level alignment of quantum dot acceptors affects the operation of hybrid polymer/quantum dot solar cells, by making use of the size-tunable energy levels of PbS quantum dots. We observe that long-lived charge transfer yield is diminished at larger dot sizes as the energy level offset at the polymer/quantum dot interface is changed through decreasing quantum confinement using a combination of spectroscopy and device studies. Chapter five discusses the effects of TiO2 surface chemistry on the performance of organometal halide perovskite solar cells. Specifically, chapter five studies the effect of replacing the conventional TiO2 electrode with Zr-doped TiO2 (Zr-TiO2). We aim to explore the correlation between charge carrier dynamics and device studies by incorporating zirconium into TiO2. We find that, compared to Zr-free controls, solar cells employing Zr-TiO2 give rise to an increase in overall power conversion efficiency, and a decrease in hysteresis. We also observe longer carrier lifetimes and higher charge carrier densities in devices on Zr-TiO2 electrodes at microsecond times in transient photovoltage experiments, as well as at longer persistent photovoltages extending from ~millisecond to tens of sec. Finally, we characterize the combined effects of pyridine treatment and Zr-TiO2 on device performance and carrier lifetimes. Advisors/Committee Members: Ginger, David S (advisor).

Subjects/Keywords: lead sulfide; photoinduced absorption; photovoltage; photovoltaics; Physical chemistry; Chemistry; chemistry

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nagaoka, H. (2015). Long-lived charge carrier dynamics in polymer/quantum dot blends and organometal halide perovskites. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/27434

Chicago Manual of Style (16^th Edition):

Nagaoka, Hirokazu. “Long-lived charge carrier dynamics in polymer/quantum dot blends and organometal halide perovskites.” 2015. Doctoral Dissertation, University of Washington. Accessed December 12, 2019. http://hdl.handle.net/1773/27434.

MLA Handbook (7^th Edition):

Nagaoka, Hirokazu. “Long-lived charge carrier dynamics in polymer/quantum dot blends and organometal halide perovskites.” 2015. Web. 12 Dec 2019.

Vancouver:

Nagaoka H. Long-lived charge carrier dynamics in polymer/quantum dot blends and organometal halide perovskites. [Internet] [Doctoral dissertation]. University of Washington; 2015. [cited 2019 Dec 12]. Available from: http://hdl.handle.net/1773/27434.

Council of Science Editors:

Nagaoka H. Long-lived charge carrier dynamics in polymer/quantum dot blends and organometal halide perovskites. [Doctoral Dissertation]. University of Washington; 2015. Available from: http://hdl.handle.net/1773/27434

University of Washington

14. Nagaoka, Hirokazu. Long-lived charge carrier dynamics in polymer/quantum dot blends and organometal halide perovskites.

Degree: PhD, 2015, University of Washington

URL: http://hdl.handle.net/1773/33118

► Solution-processable semiconductors offer a potential route to deploy solar panels on a wide scale, based on the possibility of reduced manufacturing costs by using earth-abundant… (more)

▼ Solution-processable semiconductors offer a potential route to deploy solar panels on a wide scale, based on the possibility of reduced manufacturing costs by using earth-abundant materials and inexpensive production technologies, such as inkjet or roll-to-roll printing. Understanding the fundamental physics underlying device operation is important to realize this goal. This dissertation describes studies of two kinds of solar cells: hybrid polymer/PbS quantum dot solar cells and organometal halide perovskite solar cells. Chapter two discusses details of the experimental techniques. Chapter three and four explore the mechanisms of charge transfer and energy transfer spectroscopically, and find that both processes contribute to the device photocurrent. Chapter four investigates the important question of how the energy level alignment of quantum dot acceptors affects the operation of hybrid polymer/quantum dot solar cells, by making use of the size-tunable energy levels of PbS quantum dots. We observe that long-lived charge transfer yield is diminished at larger dot sizes as the energy level offset at the polymer/quantum dot interface is changed through decreasing quantum confinement using a combination of spectroscopy and device studies. Chapter five discusses the effects of TiO2 surface chemistry on the performance of organometal halide perovskite solar cells. Specifically, chapter five studies the effect of replacing the conventional TiO2 electrode with Zr-doped TiO2 (Zr-TiO2). We aim to explore the correlation between charge carrier dynamics and device studies by incorporating zirconium into TiO2. We find that, compared to Zr-free controls, solar cells employing Zr-TiO2 give rise to an increase in overall power conversion efficiency, and a decrease in hysteresis. We also observe longer carrier lifetimes and higher charge carrier densities in devices on Zr-TiO2 electrodes at microsecond times in transient photovoltage experiments, as well as at longer persistent photovoltages extending from ~millisecond to tens of sec. Finally, we characterize the combined effects of pyridine treatment and Zr-TiO2 on device performance and carrier lifetimes. Advisors/Committee Members: Ginger, David S (advisor).

Subjects/Keywords: lead sulfide; photoinduced absorption; photovoltage; photovoltaics; Physical chemistry; Chemistry; chemistry

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❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nagaoka, H. (2015). Long-lived charge carrier dynamics in polymer/quantum dot blends and organometal halide perovskites. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/33118

Chicago Manual of Style (16^th Edition):

Nagaoka, Hirokazu. “Long-lived charge carrier dynamics in polymer/quantum dot blends and organometal halide perovskites.” 2015. Doctoral Dissertation, University of Washington. Accessed December 12, 2019. http://hdl.handle.net/1773/33118.

MLA Handbook (7^th Edition):

Nagaoka, Hirokazu. “Long-lived charge carrier dynamics in polymer/quantum dot blends and organometal halide perovskites.” 2015. Web. 12 Dec 2019.

Vancouver:

Nagaoka H. Long-lived charge carrier dynamics in polymer/quantum dot blends and organometal halide perovskites. [Internet] [Doctoral dissertation]. University of Washington; 2015. [cited 2019 Dec 12]. Available from: http://hdl.handle.net/1773/33118.

Council of Science Editors:

Nagaoka H. Long-lived charge carrier dynamics in polymer/quantum dot blends and organometal halide perovskites. [Doctoral Dissertation]. University of Washington; 2015. Available from: http://hdl.handle.net/1773/33118

University of Notre Dame

15. Steven M. Kobosko. Multinary Semiconductor Quantum Dots: Photophysical Properties and Photovoltaic Applications</h1>.

Degree: PhD, Chemical and Biomolecular Engineering, 2018, University of Notre Dame

URL: https://curate.nd.edu/show/9g54xg97856

► Multinary quantum dots such as AgInS₂ and alloyed AgInS₂-ZnS are an emerging class of semiconductor materials being explored in numerous applications such as bioimaging,… (more)

Subjects/Keywords: AgInS2-ZnS; Photovoltaic Solar Cells; Photoinduced Electron Transfer; Quantum Dots; Photophysics

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APA (6^th Edition):

Kobosko, S. M. (2018). Multinary Semiconductor Quantum Dots: Photophysical Properties and Photovoltaic Applications</h1>. (Doctoral Dissertation). University of Notre Dame. Retrieved from https://curate.nd.edu/show/9g54xg97856

Chicago Manual of Style (16^th Edition):

Kobosko, Steven M.. “Multinary Semiconductor Quantum Dots: Photophysical Properties and Photovoltaic Applications</h1>.” 2018. Doctoral Dissertation, University of Notre Dame. Accessed December 12, 2019. https://curate.nd.edu/show/9g54xg97856.

MLA Handbook (7^th Edition):

Kobosko, Steven M.. “Multinary Semiconductor Quantum Dots: Photophysical Properties and Photovoltaic Applications</h1>.” 2018. Web. 12 Dec 2019.

Vancouver:

Kobosko SM. Multinary Semiconductor Quantum Dots: Photophysical Properties and Photovoltaic Applications</h1>. [Internet] [Doctoral dissertation]. University of Notre Dame; 2018. [cited 2019 Dec 12]. Available from: https://curate.nd.edu/show/9g54xg97856.

Council of Science Editors:

Kobosko SM. Multinary Semiconductor Quantum Dots: Photophysical Properties and Photovoltaic Applications</h1>. [Doctoral Dissertation]. University of Notre Dame; 2018. Available from: https://curate.nd.edu/show/9g54xg97856

University of North Texas

16. Obondi, Christopher O. High-Energy, Long-Lived Charge Separated States via Molecular Engineering of Triplet State Donor-Acceptor Systems.

Degree: 2018, University of North Texas

URL: https://digital.library.unt.edu/ark:/67531/metadc1248463/

► Molecular engineering of donor-acceptor dyads and multimodular systems to control the yield and lifetime of charge separation is one of the key goals of artificial… (more)

▼ Molecular engineering of donor-acceptor dyads and multimodular systems to control the yield and lifetime of charge separation is one of the key goals of artificial photosynthesis for harvesting sustainably solar energy. The design of the donor-acceptor systems mimic a part of green plants and bacterial photosynthetic processes. The photochemical events in natural photosynthesis involve the capturing and funneling of solar energy by a group of well-organized chromophores referred to as an ‘antenna' system causing an electron transfer into the ‘reaction center,' where an electron transfer processes occur resulting a long-lived charge separated state. Over the last two to three decades, many efforts have been directed by the scientific community designing of multi-modular systems that are capable of capturing most of the useful sunlight and generating charge separated states of prolonged lifetimes with adequate amounts of energy. In this dissertation, we report on the design and synthesis of donor–acceptor conjugates with the goal of modulating the yield and lifetime of their charge separated states and hence, improving the conversion of light energy into chemical potential. In simple donor-acceptor systems, generally, the energy and electron transfer events originate from the singlet excited state of the donor or acceptor and can store the greatest amount of energy but must be fast to out compete intersystem crossing. To address this limitation, we have designed novel donor –acceptor conjugates that use high-energy triplet sensitizers in which electron transfer is initiated from the long lived triplet state of the donor. The triplet photosensitizers used were palladium(II) porphyrin and platinum(II) porphyrin. Heavy metal effect in these porphyrins promoted intersystem crossing and the energies of their excited state was quite high. For the case of palladium (II) porphyrin the energy stored was found to 1.89 eV and that of platinum(II) porphyrin 1.84 eV. In addition to using triplet photosensitizers as donors, we have used donors that are difficult to oxidize and hence producing long lived charge separated states with adequate amount of stored energy. The system that was used for this study is zinc porphyrin with meso-aryl pentafluorophenyl substituents and fullerene, C60 as the acceptor. The presence of fluorine substituents on zinc porphyrin makes it harder to undergo oxidation. When this high potential donor-acceptor system undergoes a photoinduced charge-separation, the estimated energy stored was found to be 1.70 eV, one of the highest reported in literature so far. To further extend the lifetime of the charge separated states generated in this high-potential zinc porphyrin-fullerene dyad a pyridine functionalized tetrathiafulvalene was axially coordinated to the Zn metal producing a supramolecular triad capable of producing long-lived charge separated state. In a subsequent study, a multi-modular donor-acceptor system composed of a porphyrin, fullerene (C60) and a BF2-chelated dipyrromethene (BODIPY) with a… Advisors/Committee Members: D'Souza, Francis, Richmond, Michael, Golden, Teresa, Cundari, Tom.

Subjects/Keywords: Donor-Acceptor systems; Triplet sensitizers; Photoinduced charge-separation; Chemistry, Organic

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Obondi, C. O. (2018). High-Energy, Long-Lived Charge Separated States via Molecular Engineering of Triplet State Donor-Acceptor Systems. (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc1248463/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Obondi, Christopher O. “High-Energy, Long-Lived Charge Separated States via Molecular Engineering of Triplet State Donor-Acceptor Systems.” 2018. Thesis, University of North Texas. Accessed December 12, 2019. https://digital.library.unt.edu/ark:/67531/metadc1248463/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Obondi, Christopher O. “High-Energy, Long-Lived Charge Separated States via Molecular Engineering of Triplet State Donor-Acceptor Systems.” 2018. Web. 12 Dec 2019.

Vancouver:

Obondi CO. High-Energy, Long-Lived Charge Separated States via Molecular Engineering of Triplet State Donor-Acceptor Systems. [Internet] [Thesis]. University of North Texas; 2018. [cited 2019 Dec 12]. Available from: https://digital.library.unt.edu/ark:/67531/metadc1248463/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Obondi CO. High-Energy, Long-Lived Charge Separated States via Molecular Engineering of Triplet State Donor-Acceptor Systems. [Thesis]. University of North Texas; 2018. Available from: https://digital.library.unt.edu/ark:/67531/metadc1248463/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Arizona

17. Schneider, Zachary. Photoinduced Manipulation of the Molecular Assembly in Heteroleptic Titanium Metal Alkoxides for Use in Optical Devices .

Degree: 2010, University of Arizona

URL: http://hdl.handle.net/10150/194666

► The manipulation of molecular structures is an important enabling technology for future advances in nanotechnology. The ability to control the synthesis of nanostructured materials, such… (more)

▼ The manipulation of molecular structures is an important enabling technology for future advances in nanotechnology. The ability to control the synthesis of nanostructured materials, such as the bond formation and geometry of a molecule is of great significance to nanoscience as nanosystems are constructed from these smaller units. Influencing the assembly of molecular structures at the early stages of material formation can modify the ensuing molecular aggregate structure with the potential for impact in a broad range of optical, chemical, and biological applications. Heteroleptic titanium metal alkoxides (OPy)₂Ti(4MP) ₂ and (OPy)₂Ti(TAP)₂, where OPy = OC₆H₆N, 4MP = OC₆H₄(SH)-4, and TAP = OC₆H₂(CH₂N(CH₃)₂)₃-2,4,6 were investigated as precursors for thin film and solution-based synthesis of oxide materials via the photoactivation of intermolecular reactions (e.g. hydrolysis/condensation) at selected ligand sites about the metal center. Manipulation of the molecular structure of these photosensitive metal alkoxides was achieved through the use of optical irradiation parameters, such as the tuning of the excitation wavelength, total optical fluence, and pulse energy intensity. Irradiating these metal alkoxides with UV-light was seen to cause photodisruption in the ligand groups leading to the formation of Ti-O-Ti linking via hydrolysis and condensation reactions. In spin-coated (OPy)₂Ti(TAP)₂ films, these photoinduced bridge bond formations resulted in an increase in refractive index and film densification as well as produced an insoluble film when rinsed in pyridine. By making use of these photoinduced film properties, the formation of physical relief structures from spin-coated (OPy)₂Ti(TAP)₂ films was demonstrated along with the ability to photopattern sub-micron and nanometer features. In addition, the micro- and nanostructure of thin films were optically manipulated through several deposition methods; a novel dip-coated in-situ photodeposition technique was utilized by illuminating at specific distances above the meniscus to further control the early stages of material formation due to changes in the mobility of the reactants from the evaporation and gravitational draining of the solvent. The ability to manipulate molecular development at the on-set of material formation through different deposition techniques and optical parameters allowed for the creation of several thin film optical devices, such as gratings, micro-optic lenslet arrays, and binary "on-off" patterned devices. Advisors/Committee Members: Simmons-Potter, Kelly (advisor), Potter, Jr., Barrett (committeemember), Falco, Charles (committeemember).

Subjects/Keywords: nanotechnology; photoinduced effects; sol-gel; thin films; titanium metal alkoxides

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Schneider, Z. (2010). Photoinduced Manipulation of the Molecular Assembly in Heteroleptic Titanium Metal Alkoxides for Use in Optical Devices . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/194666

Chicago Manual of Style (16^th Edition):

Schneider, Zachary. “Photoinduced Manipulation of the Molecular Assembly in Heteroleptic Titanium Metal Alkoxides for Use in Optical Devices .” 2010. Doctoral Dissertation, University of Arizona. Accessed December 12, 2019. http://hdl.handle.net/10150/194666.

MLA Handbook (7^th Edition):

Schneider, Zachary. “Photoinduced Manipulation of the Molecular Assembly in Heteroleptic Titanium Metal Alkoxides for Use in Optical Devices .” 2010. Web. 12 Dec 2019.

Vancouver:

Schneider Z. Photoinduced Manipulation of the Molecular Assembly in Heteroleptic Titanium Metal Alkoxides for Use in Optical Devices . [Internet] [Doctoral dissertation]. University of Arizona; 2010. [cited 2019 Dec 12]. Available from: http://hdl.handle.net/10150/194666.

Council of Science Editors:

Schneider Z. Photoinduced Manipulation of the Molecular Assembly in Heteroleptic Titanium Metal Alkoxides for Use in Optical Devices . [Doctoral Dissertation]. University of Arizona; 2010. Available from: http://hdl.handle.net/10150/194666

University of Arizona

18. Chandra, Haripin. Characterization of the Photosensitive Response in Polysilane-based Organic/Inorganic Hybrid Materials .

Degree: 2007, University of Arizona

URL: http://hdl.handle.net/10150/195442

► The motivation for the current work stems from a unique application, i.e. the photopatterning of optical functionality in a photosensitive material immediately prior to use.… (more)

▼ The motivation for the current work stems from a unique application, i.e. the photopatterning of optical functionality in a photosensitive material immediately prior to use. In this case, optical devices such as diffraction gratings and optical interconnects are produced in thin films using integrated photonic sources under relatively uncontrolled environmental conditions. The compatibility of the material photoexcitation mechanism with wavelength and fluence levels available from compact solid-state optical sources and the need to understand the impact of local atmospheric composition and temperature on the photosensitive material response are therefore of primary concern. The primary goal of the current study was to investigate photoexcitation mechanisms and photoinduced optical and structural changes in promising candidate material systems for this application: polysilane and polygermane-based molecular hybrid polymers. The work pursued the development of a fundamental understanding of the key photophysical and photostructural responses of thin films composed of both pure, linear-chain polysilanes and of a Ge-Si copolymer. The effects of molecular modifications to the polymers, including polymer backbone catenate structure and side-group identity, on the optical and photosensitive behavior observed in these systems are examined. Through such effort, an understanding of how such structural characteristics influence key photosensitive properties, i.e. the excitation wavelength and the resulting photoinduced optical property changes, was attained. A related objective in the present work was to characterize the thermal stability of these hybrid polymers, specifically in terms of the effect of thermal treatment on as-deposited and photomodified materials. In this case, an evaluation of the similarities and differences in structural modification in response to both thermal and optical fields was pursued. The primary mechanism associated with the photoinduced phenomena observed in both polysilane and polygermane involves backbone chain scissioning and the formation of silane-radicals upon absorption of near-UV (λ ≈ 300 to 400 nm) photons, resonant with the lowest energy, σ - σ* (HOMO-LUMO) transition of the Group IVA backbone. The final photoproducts obtained result from a mixture of different competing processes which occur subsequent to this initial photoscissioning. In aerobic atmospheric environments, the radicals formed capture oxygen and form oxide linkages forming the dominant photoproducts. On the other hand, under anaerobic conditions, photooxidation is suppressed while hydride passivation of the radical dominates the response. The oxidized product, resulting from irradiation under the aerobic environment, exhibited higher refractive index changes than irradiation under anaerobic conditions. Photoexcitation using higher energy photons (typically λ ≈ 230 to 300 nm) are resonant with side-group transitions associated with π-conjugated states of the cyclic moieties. Under these conditions, the excitation accesses… Advisors/Committee Members: Potter, Barrett G (advisor), Potter, Kelly S (advisor), Lucas, Pierre (committeemember), Potter, Kelly S. (committeemember), Deymier, Pierre A. (committeemember).

Subjects/Keywords: Polysilane; photosensitive; polysilylene; photoinduced; photopatterning

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APA (6^th Edition):

Chandra, H. (2007). Characterization of the Photosensitive Response in Polysilane-based Organic/Inorganic Hybrid Materials . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/195442

Chicago Manual of Style (16^th Edition):

Chandra, Haripin. “Characterization of the Photosensitive Response in Polysilane-based Organic/Inorganic Hybrid Materials .” 2007. Doctoral Dissertation, University of Arizona. Accessed December 12, 2019. http://hdl.handle.net/10150/195442.

MLA Handbook (7^th Edition):

Chandra, Haripin. “Characterization of the Photosensitive Response in Polysilane-based Organic/Inorganic Hybrid Materials .” 2007. Web. 12 Dec 2019.

Vancouver:

Chandra H. Characterization of the Photosensitive Response in Polysilane-based Organic/Inorganic Hybrid Materials . [Internet] [Doctoral dissertation]. University of Arizona; 2007. [cited 2019 Dec 12]. Available from: http://hdl.handle.net/10150/195442.

Council of Science Editors:

Chandra H. Characterization of the Photosensitive Response in Polysilane-based Organic/Inorganic Hybrid Materials . [Doctoral Dissertation]. University of Arizona; 2007. Available from: http://hdl.handle.net/10150/195442

University of Pennsylvania

19. Liu, Gerui. Nonlinear Optical Responses In Type-Ii Weyl Semimetals.

Degree: 2019, University of Pennsylvania

URL: https://repository.upenn.edu/edissertations/3317

► Weyl semimetals are gapless topological states of matter with broken inversion and/or time reversal symmetry. In this thesis, we will firstly discuss the observation of… (more)

▼ Weyl semimetals are gapless topological states of matter with broken inversion and/or time reversal symmetry. In this thesis, we will firstly discuss the observation of a novel photogalvanic effect in type-II Weyl semimetals including T_d-MoTe₂, Mo_0.9W_0.1Te₂ and Mo_0.3W_0.7Te₂. A circulating photocurrent is obtained under the illumination of normally incident light with circular polarization and the circulating current direction is opposite with different light helicity. Through temperature induced phase transition of MoTe₂, this effect is further confirmed to exclusively occur in the Weyl phase. Since this CPGE current is controlled by the spatially varying beam profile, we define the effect as a spatially dispersive circular photogalvanic effect (sCPGE) and current amplitude is proven to be proportional to the beam gradient. By performing frequency-dependent measurements on the Weyl phase, we observe a sign reversal of sCPGE current at high energy excitation and low energy excitation. Our theoretical derivation shows that sCPGE is controlled by a unique symmetry selection rule related to asymmetric carrier excitation and relaxation, explaining the difference between Weyl phase and trivial phase as well as frequency dependent properties. Photoinduced anomalous Hall effect (AHE) is also observed in type-II Weyl semimetals. Longitudinal CPGE current is obtained under normally incident light while applying transverse bias, and the current magnitude is observed to be proportional to the bias voltage. Comparing the AHE conductivity in the 1T' phase and the T_d phase of MoTe₂, photoinduced AHE is found to be much more significant in Weyl phase. This effect can be understood by symmetry arguments and is described by a Fermi surface modulation under the external electric field; meanwhile, the difference between two phases is evaluated. This model further predicts that under low energy excitation, Weyl points can be partially muted with tilted Fermi level, which provides a promising method to probe the band topology and Weyl nodes as well as encode more degree of freedom in device applications. Our studies on sCPGE and photoinduced AHE in type-II Weyl semimetals provide a new idea of probing and controlling nonlinear optical responses of topological semimetals and will potentially promote the applications of those new material systems.

Subjects/Keywords: CPGE; NONLINEAR OPTICAL RESPONSES; photoinduced AHE; WEYL SEMIMETALS; Mechanics of Materials

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APA (6^th Edition):

Liu, G. (2019). Nonlinear Optical Responses In Type-Ii Weyl Semimetals. (Thesis). University of Pennsylvania. Retrieved from https://repository.upenn.edu/edissertations/3317

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Liu, Gerui. “Nonlinear Optical Responses In Type-Ii Weyl Semimetals.” 2019. Thesis, University of Pennsylvania. Accessed December 12, 2019. https://repository.upenn.edu/edissertations/3317.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Liu, Gerui. “Nonlinear Optical Responses In Type-Ii Weyl Semimetals.” 2019. Web. 12 Dec 2019.

Vancouver:

Liu G. Nonlinear Optical Responses In Type-Ii Weyl Semimetals. [Internet] [Thesis]. University of Pennsylvania; 2019. [cited 2019 Dec 12]. Available from: https://repository.upenn.edu/edissertations/3317.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Liu G. Nonlinear Optical Responses In Type-Ii Weyl Semimetals. [Thesis]. University of Pennsylvania; 2019. Available from: https://repository.upenn.edu/edissertations/3317

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Utah

20. Hukic-Markosian, Golda. Optical and magnetic resonance studies of organic materials used in photovoltaic applications.

Degree: PhD, Physics, 2011, University of Utah

URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/319/rec/1750

► In this work we focused on the electronic processes in active materials used in organic photovoltaics. Films of several electron donors, acceptors, and their blends… (more)

▼ In this work we focused on the electronic processes in active materials used in organic photovoltaics. Films of several electron donors, acceptors, and their blends were investigated by means of steady state optical and magnetic resonance probes. The efficiency of organic photovoltaics depends on film morphology, charge mobility and light absorption. Therefore we studied common donor materials with very different morphology: RR P3HT (regioregular poly(3-hexylthiophene)) and RRa P3HT (regio-random poly(3-hexylthiophene)). The charge transport is affected by regioregularity and molecular weight. Consequently, we examined RR P3HT polymers with various molecular weights. We learned that a polaron band at low photon energy only appears in the photoinduced absorption spectrum of low molecular weight RR P3HT. We studied two main approaches for improving the efficiency of organic photovoltaics: modifying the lowest (highest) unoccupied (occupied) molecular orbital, LUMO (HOMO) of the donor (acceptor) materials; as well as synthesizing polymer donors with low optical gap. TAES-V is a low-band gap polymer composed of three co-polymers having the structure of „donor-acceptor-donor?. Its record power conversion efficiency (~7%) when blended with PC70BM is partially due to the significantly red-shifted absorption. Our results show that an intrachain charge transfer exciton (CTE) is long-lived in this polymer and that it persists in the blend with PC70BM. In addition we studied three fullerene derivatives. The LUMO of a fullerene derivative can be changed by the addition of functional side groups to the fullerene cage that improves the organic solar cells performance. The addition can also lead to hindering of aggregation in the films, which consequently decreases the charge transport in solar cells. In the study of polymer/fullerene blends we mixed RR P3HT with three different fullerene derivatives. We conclude that higher power conversion efficiency of a blend is mainly due to the higher LUMO level and improved open circuit voltage. We also compared DOO-PPV (H-polymer) with DOO-PPV enriched with deuterium (D-polymer). We show that hyperfine interaction is weaker in the D-polymer and that the spin relaxation rate is four times smaller than in H-polymer. Consequently, the longer spin diffusion length makes the D-polymer better suited for higher performing organic spin-valves.

Subjects/Keywords: Electroabsorption; Electron spin resonance; Optically detected magnetic resonance; Organic photovoltaic cells; Photoinduced absorption; Photoluminescence; Photovoltaics

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APA (6^th Edition):

Hukic-Markosian, G. (2011). Optical and magnetic resonance studies of organic materials used in photovoltaic applications. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/319/rec/1750

Chicago Manual of Style (16^th Edition):

Hukic-Markosian, Golda. “Optical and magnetic resonance studies of organic materials used in photovoltaic applications.” 2011. Doctoral Dissertation, University of Utah. Accessed December 12, 2019. http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/319/rec/1750.

MLA Handbook (7^th Edition):

Hukic-Markosian, Golda. “Optical and magnetic resonance studies of organic materials used in photovoltaic applications.” 2011. Web. 12 Dec 2019.

Vancouver:

Hukic-Markosian G. Optical and magnetic resonance studies of organic materials used in photovoltaic applications. [Internet] [Doctoral dissertation]. University of Utah; 2011. [cited 2019 Dec 12]. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/319/rec/1750.

Council of Science Editors:

Hukic-Markosian G. Optical and magnetic resonance studies of organic materials used in photovoltaic applications. [Doctoral Dissertation]. University of Utah; 2011. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/319/rec/1750

21. Tintu, R. Fabrication and Characterization of Chalcogenide nano composite based materials for Photonic device applications.

Degree: 2011, Cochin University of Science and Technology

URL: http://dyuthi.cusat.ac.in/purl/2780

►

In this context,in search of new materials based on chalcogenide glasses,we have developed a novel technique for fabrication of chalcogenide nano composites which are presented… (more)

Subjects/Keywords: Chalcogenide glass; Photoinduced darkening; Amorphous Selenium; Nano colloids; Photonic Device Applications; Photonics

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APA (6^th Edition):

Tintu, R. (2011). Fabrication and Characterization of Chalcogenide nano composite based materials for Photonic device applications. (Thesis). Cochin University of Science and Technology. Retrieved from http://dyuthi.cusat.ac.in/purl/2780

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tintu, R. “Fabrication and Characterization of Chalcogenide nano composite based materials for Photonic device applications.” 2011. Thesis, Cochin University of Science and Technology. Accessed December 12, 2019. http://dyuthi.cusat.ac.in/purl/2780.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tintu, R. “Fabrication and Characterization of Chalcogenide nano composite based materials for Photonic device applications.” 2011. Web. 12 Dec 2019.

Vancouver:

Tintu R. Fabrication and Characterization of Chalcogenide nano composite based materials for Photonic device applications. [Internet] [Thesis]. Cochin University of Science and Technology; 2011. [cited 2019 Dec 12]. Available from: http://dyuthi.cusat.ac.in/purl/2780.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tintu R. Fabrication and Characterization of Chalcogenide nano composite based materials for Photonic device applications. [Thesis]. Cochin University of Science and Technology; 2011. Available from: http://dyuthi.cusat.ac.in/purl/2780

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

22. La Rosa, Marcello. Development of luminescent semiconductor nanocrystals (Quantum Dots) for photoinduced applications : Développement de nanocristaux semi-conducteurs luminescents (Quantum Dots) pour des applications photo-induites.

Degree: Docteur es, Chimie physique, 2017, Bordeaux

URL: http://www.theses.fr/2017BORD0591

►

Cette thèse s’est focalisée sur le développement de nanocristaux semi-conducteurs luminescents, i.e. des boîtes quantiques (quantum dots, QDs), pour des applications photo-induites. Ces nanomatériaux possèdent… (more)

▼

Cette thèse s’est focalisée sur le développement de nanocristaux semi-conducteurs luminescents, i.e. des boîtes quantiques (quantum dots, QDs), pour des applications photo-induites. Ces nanomatériaux possèdent des propriétés optiques très intéressantes qui dépendent de leur taille et sont prometteurs pour des applications dans divers domaines.Les QD sont généralement hydrophobes mais de nombreuses applications intéressantes requiert une compatibilité avec l'eau ou du moins avec un environnement polaire. Cela, nécessite donc un traitement post-synthétique afin de modifier leur solubilité.Au cours de cette thèse, une nouvelle méthode pour transférer les QDs d'un solvant apolaire vers un solvant polaire a été développée en les fonctionnalisant avec l'acide lipoïque, un tensioactif complexant.L'acide lipoïque est une molécule chirale générant donc un effet de dichroïsme induit qui a pu être étudier, ainsi que sa dépendance vis-à-vis la taille des nanocristaux.Un objectif clef de ces recherches était le développement de QDs présentant un transfert d'énergie électronique réversible (REET). Il s’agit d’un transfert d'énergie bidirectionnel entre les QDs photoexcités et des unités chromophores appropriées fixées sur leur surface, dont la conséquence la plus importante est l'allongement de la durée de vie de luminescence du QD.Enfin, un nouveau protocole pour le dépôt de QDs chargés sur un substrat vitreux localement polarisé a été développé en collaboration avec le Dr Marc Dussauze de l'Université de Bordeaux.

This thesis focuses on the development of luminescent semiconductor nanocrystals quantum dots (QDs) for photoinduced applications. QDs are promising nanomaterials with size-dependent optical properties and are attractive for applications in several fields.However, QDs are commonly hydrophobic and many interesting applications require their compatibility with water or at least with a polar environment, meaning a post-synthetic treatment is required to confer a different solubility.During these studies, a new method for transferring QDs from an apolar solvent to another one polar has been successfully developed, by exploiting lipoic acid, as a versatile surface capping agent. Moreover, lipoic acid is a chiral molecule so a possible induced dichroism effect has been also investigated, as well as its dependence on the size of nanocrystals.A major aim of this research was the development of QDs exhibiting reversible electronic energy transfer (REET). Such a process is a bidirectional energy transfer between the photoexcited QDs and suitable chromophoric units attached on their surface, whose most important consequence is the elongation of the luminescence lifetime of the QD. Strong experimental evidence for REET and accompanying modifications of the photophysical properties has been obtained. Such a process to our knowledge has never been observed in QD-based systems.Finally, a novel protocol for depositing charged QDs on a locally polarized glassy substrate has been developed in collaboration with Dr. Marc Dussauze of…

Advisors/Committee Members: McClenaghan, Nathan (thesis director), Credi, Alberto (thesis director).

Subjects/Keywords: Nanocristaux; Semi-conducteurs; Fonctionnalisation; Transfert d'énergie; Photo-induites; Nanocrystals; Semiconductor; Luminescent; Energy transfer; Photoinduced

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

La Rosa, M. (2017). Development of luminescent semiconductor nanocrystals (Quantum Dots) for photoinduced applications : Développement de nanocristaux semi-conducteurs luminescents (Quantum Dots) pour des applications photo-induites. (Doctoral Dissertation). Bordeaux. Retrieved from http://www.theses.fr/2017BORD0591

Chicago Manual of Style (16^th Edition):

La Rosa, Marcello. “Development of luminescent semiconductor nanocrystals (Quantum Dots) for photoinduced applications : Développement de nanocristaux semi-conducteurs luminescents (Quantum Dots) pour des applications photo-induites.” 2017. Doctoral Dissertation, Bordeaux. Accessed December 12, 2019. http://www.theses.fr/2017BORD0591.

MLA Handbook (7^th Edition):

La Rosa, Marcello. “Development of luminescent semiconductor nanocrystals (Quantum Dots) for photoinduced applications : Développement de nanocristaux semi-conducteurs luminescents (Quantum Dots) pour des applications photo-induites.” 2017. Web. 12 Dec 2019.

Vancouver:

La Rosa M. Development of luminescent semiconductor nanocrystals (Quantum Dots) for photoinduced applications : Développement de nanocristaux semi-conducteurs luminescents (Quantum Dots) pour des applications photo-induites. [Internet] [Doctoral dissertation]. Bordeaux; 2017. [cited 2019 Dec 12]. Available from: http://www.theses.fr/2017BORD0591.

Council of Science Editors:

La Rosa M. Development of luminescent semiconductor nanocrystals (Quantum Dots) for photoinduced applications : Développement de nanocristaux semi-conducteurs luminescents (Quantum Dots) pour des applications photo-induites. [Doctoral Dissertation]. Bordeaux; 2017. Available from: http://www.theses.fr/2017BORD0591

University of Saskatchewan

23. DeForrest, Dan. Photoinduced dichroism in amorphous As2Se3 thin film.

Degree: 2005, University of Saskatchewan

URL: http://hdl.handle.net/10388/etd-12202005-121419

► The dichroism in amorphous As2Se3 induced by a polarized beam of near band-gap light (λ = 632.8 nm) was measured in films that ranged in… (more)

▼ The dichroism in amorphous As2Se3 induced by a polarized beam of near band-gap light (λ = 632.8 nm) was measured in films that ranged in thickness from 0.25 µm to 1.93 µm. Most noncrystalline materials are initially isotropic and homogeneous. When amorphous As2Se3 (a chalcogenide glass) absorbs an intense pump-beam of polarized light, the absorption coefficient for light polarized in the same direction as the pump-beam is less than for the perpendicular polarization, i.e. the sample becomes anisotropic (dichroic). The induced dichroism is reversible by rotating the polarization of the pump light by 90°. Induced dichroism is potentially useful in various photonic devices including optical switches, optical memory, and photowritable polarizers.Several aspects of photoinduced anisotropy in a-As2Se3 have been analyzed:(i) rate of photoinduced anisotropy buildup as a function of inducing beam intensity and sample thickness, (ii) the kinetics of the photoinduced anisotropy buildup in terms of a stretched exponential curve, (iii) the stretched exponent, β, as a function of inducing beam intensity and sample thickness, (iv) reversibility of the photoinduced anisotropy, (v) saturation level of photoinduced anisotropy as a function of inducing beam intensity and sample thickness.The anisotropy buildup kinetics has been found to follow a stretched exponential behavior and that there exists an inverse relationship between the pump intensity and the time constant, τ. The τ(I) vs intensity (I) relationship more closely follows a logistic dose response curve than a simple straight line or power law relationship. There exists a direct relationship between the time contact  and the sample thickness, where a longer anisotropy buildup time is required as the sample thickness increases. The stretched exponent, β, was found to be approximately 0.6 and has a slight dependence on the inducing light intensity. The correlation of the stretching exponent, β, to sample thickness, L, was found to have a weak inverse relationship, that is β tends to decrease as the sample thickness increases.The findings in this work demonstrate that the anisotropy orientation could be changed indefinitely since it was found that even after 100 orientation changes the anisotropy saturation had no measurable fatiguing. The anisotropy saturation level was found to be independent of the inducing beam intensity and linearly proportional to the sample thickness. Advisors/Committee Members: Kasap, Safa O., Teng, Hsiang-Yung (Daniel), Johanson, Robert E., Daku, Brian L., Bolton, Ronald J., Xiao, Chijin.

Subjects/Keywords: photoinduced; dichroism; anisotropy; amorphous; thin film

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APA (6^th Edition):

DeForrest, D. (2005). Photoinduced dichroism in amorphous As2Se3 thin film. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-12202005-121419

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

DeForrest, Dan. “Photoinduced dichroism in amorphous As2Se3 thin film.” 2005. Thesis, University of Saskatchewan. Accessed December 12, 2019. http://hdl.handle.net/10388/etd-12202005-121419.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

DeForrest, Dan. “Photoinduced dichroism in amorphous As2Se3 thin film.” 2005. Web. 12 Dec 2019.

Vancouver:

DeForrest D. Photoinduced dichroism in amorphous As2Se3 thin film. [Internet] [Thesis]. University of Saskatchewan; 2005. [cited 2019 Dec 12]. Available from: http://hdl.handle.net/10388/etd-12202005-121419.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

DeForrest D. Photoinduced dichroism in amorphous As2Se3 thin film. [Thesis]. University of Saskatchewan; 2005. Available from: http://hdl.handle.net/10388/etd-12202005-121419

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

24. Zomerman, Derek J 1989-. Control and Characterization of Organic Solar Cell Morphology Through Variable-Pressure Solvent Vapour Annealing.

Degree: 2018, University of Saskatchewan

URL: http://hdl.handle.net/10388/11500

► Organic photovoltaics (OPVs) have recently experienced a tremendous increase in efficiency due to advancements in light absorbing materials and improvements in film morphology control. Solvent… (more)

Subjects/Keywords: organic photovoltaics; bulk heterojunctions; morphology control; solvent vapor annealing; photoinduced force microscopy

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APA (6^th Edition):

Zomerman, D. J. 1. (2018). Control and Characterization of Organic Solar Cell Morphology Through Variable-Pressure Solvent Vapour Annealing. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/11500

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zomerman, Derek J 1989-. “Control and Characterization of Organic Solar Cell Morphology Through Variable-Pressure Solvent Vapour Annealing.” 2018. Thesis, University of Saskatchewan. Accessed December 12, 2019. http://hdl.handle.net/10388/11500.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zomerman, Derek J 1989-. “Control and Characterization of Organic Solar Cell Morphology Through Variable-Pressure Solvent Vapour Annealing.” 2018. Web. 12 Dec 2019.

Vancouver:

Zomerman DJ1. Control and Characterization of Organic Solar Cell Morphology Through Variable-Pressure Solvent Vapour Annealing. [Internet] [Thesis]. University of Saskatchewan; 2018. [cited 2019 Dec 12]. Available from: http://hdl.handle.net/10388/11500.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zomerman DJ1. Control and Characterization of Organic Solar Cell Morphology Through Variable-Pressure Solvent Vapour Annealing. [Thesis]. University of Saskatchewan; 2018. Available from: http://hdl.handle.net/10388/11500

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Melbourne

25. Robotham, Benjamin Edward. Ultrafast photochemistry of photosynthetic reaction centre mimics.

Degree: 2013, University of Melbourne

URL: http://hdl.handle.net/11343/38445

► In this work the photoinduced electron transfer (ET) behaviour of several photosynthetic reaction centre (RC) mimics was investigated. Particular attention was given to the decay… (more)

▼ In this work the photoinduced electron transfer (ET) behaviour of several photosynthetic reaction centre (RC) mimics was investigated. Particular attention was given to the decay pathways following excitation of the porphyrin S2 state. The systems studied are linked either by covalent or supramolecular means or a combination of both. The redox-active chromophores include zinc(II) tetraphenylporphyrin (ZnTPP), tin(IV) tetraphenylporphyrin (SnTPP), buckminsterfullerene (C60 ), an amino-substituted naphthalene diimide (ANDI) and several N-substituted naphthalene diimides (NDIs). A boron dipyrromethene (BODIPY) is employed as an energy transfer (EnT) partner. The time scales of the investigated processes required the use of ultrafast transient absorption (TA) measurements. The design and construction of the first implementation of a multichannel broadband detection TA instrument using a high repetition rate (94 kHz) amplified laser source is described. A hybrid global target analysis method, which allows TA data to be fitted by both sequential and branched decay scheme models, is also presented. In non-covalently bound ZnTPP:C60 complexes ET originating directly from the porphyrin S2 state is observed. Rapid charge recombination partially reforms both the ZnTPP S1 state as well as the ground state species. In a covalently linked ZnTPP-ANDI dyad a very similar behaviour is observed, although in this case charge recombination returns the ZnTPP S1 state near quantitatively. In both cases a non-thermalised charge separated state can be inferred. If a further thermalised charge separated state is energetically accessible from the porphyrin S1 state, a second ET step to the same acceptor can occur. In supramolecular complexes of ZnTPP with either dipyridine naphthalene diimide (pyrNDI) or diisoquinoline naphthalene diimide (isoquinNDI), ET commencing from the former’s S1 state to the NDI acceptors is observed. Isoquinoline coordination to the porphyrin metal centre, as it occurs in the ZnTPP:isoquinNDI complex, has not been previously reported as an assembly method for RC mimics. In this system the possibility of a very similar higher excited state behaviour as in the ZnTPP-ANDI dyad, i.e. ET from the porphyrin S2 state followed by charge recombination to itsS1 state, is inferred. ET from the porphyrin S2 state does not require a covalent link to the employed acceptor, although a small chromophore separation and the proximity of the frontier orbitals thereby ensured are a necessity. Finally, the photophysics of an NDI2-SnTPP:(OPh-BODIPY)2 array and several related model systems was investigated. In the NDI2-SnTPP:(OH)2 triad, ET from SnTPP to an NDI moiety is exclusively observed for porphyrin S2-excitation. The product of subsequent charge recombination, either the porphyrin S1 state or the ground state species, is strongly dependent on the solvent polarity. In the arrays containing both SnTPP…

Subjects/Keywords: photochemistry; ultrafast spectroscopy; photoinduced eletron transfer; zinc tetraphenylporphyrin; higher excited states; inverted region

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APA (6^th Edition):

Robotham, B. E. (2013). Ultrafast photochemistry of photosynthetic reaction centre mimics. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/38445

Chicago Manual of Style (16^th Edition):

Robotham, Benjamin Edward. “Ultrafast photochemistry of photosynthetic reaction centre mimics.” 2013. Doctoral Dissertation, University of Melbourne. Accessed December 12, 2019. http://hdl.handle.net/11343/38445.

MLA Handbook (7^th Edition):

Robotham, Benjamin Edward. “Ultrafast photochemistry of photosynthetic reaction centre mimics.” 2013. Web. 12 Dec 2019.

Vancouver:

Robotham BE. Ultrafast photochemistry of photosynthetic reaction centre mimics. [Internet] [Doctoral dissertation]. University of Melbourne; 2013. [cited 2019 Dec 12]. Available from: http://hdl.handle.net/11343/38445.

Council of Science Editors:

Robotham BE. Ultrafast photochemistry of photosynthetic reaction centre mimics. [Doctoral Dissertation]. University of Melbourne; 2013. Available from: http://hdl.handle.net/11343/38445

University of North Texas

26. Gobeze, Habtom Berhane. Ultrafast Photoinduced Energy and Electron Transfer Studies in Closely Bound Molecular and Nanocarbon Donor-Acceptor Systems.

Degree: 2018, University of North Texas

URL: https://digital.library.unt.edu/ark:/67531/metadc1248516/

► As part of the study, photosynthetic system constructs based on BF2-chelated dipyrromethene (BODIPY), BF2-chelated azadipyrromethene (AzaBODIPY), porphyrin, phthalocyanine, oxasmaragdyrin, polythiophene, fullerene (C60), single-walled carbon nanotube… (more)

▼ As part of the study, photosynthetic system constructs based on BF2-chelated dipyrromethene (BODIPY), BF2-chelated azadipyrromethene (AzaBODIPY), porphyrin, phthalocyanine, oxasmaragdyrin, polythiophene, fullerene (C60), single-walled carbon nanotube and graphene are investigated. Antenna systems of BODIPY dyads and oligomers having BODIPY as an excitation energy donor connected to different acceptors including BODIPY, azaBODIPY, oxasmaragdyrin and aluminum porphyrin are studied. Different synthetic methodologies are used to afford donor-acceptor systems either directly linked with no spacer or with short spacers of varying length and orientation. The effect of donor orientation, donor optical gap as well as nature of donor-acceptor coupling on the donor-acceptor spectral overlap and hence the rate of excitation energy transfer is investigated. In all these systems, an ultrafast energy transfer followed by electron transfer is observed. In particular, in a directly connected BODIPY-azaBODIPY dyad an unusually ultrafast energy transfer (~ 150−200 f) via Förster mechanism is observed. The observation of energy transfer via Förster instead of Dexter mechanism in such closely coupled donor-acceptor systems shows the balance between spatial and electronic coupling achieved in the donor-acceptor system. Moreover, in donor-acceptor systems involving semiconducting 1D and 2D materials, covalently functionalized single-walled carbon nanotubes via charge stabilizing (TPA)3ZnP and noncovalently hybridized exfoliated graphene via polythiophene chromophores are studied for their charge transportation functions. In both cases, not only an ultrafast charge transfer in the range of (~ 2−5 p) is observed but also the charge-separated states were long lived implying the potential of these functionalized materials as efficient charge transporting substrates with organic chromophores for photovoltaic and optoelectronic applications where ultrafast intercomponent charge transfer is vital. In addition, as a final part of this dissertation, the mechanisms of electron injection and back electron transfer in heterogeneous systems involving supramolecularly anchored high potential chromophores on TiO2 film are studied by femtosecond transient absorption spectroscopy. In this study, not only are important insights gained on the utilization of supramolecular anchoring of chromophores such as porphyrins, phthalocyanines, and their perflorinated high potential analogues, chromophores currently showing promise as highly efficient sensitizers in dye sensitized solar cells, on TiO2 film but also on the effect of anchor length and sensitizer orientation on the rates of electron injection and back electron transfer at the sensitizer-TiO2 interface. Advisors/Committee Members: D'Souza, Francis, Chyan, Oliver M.R., Slaughter, Legrande, El Bouanani, Mohamed.

Subjects/Keywords: Ultrafast Photoinduced Energy and Electron transfer; Donor-acceptor system; Photosynthesis; Transient absorption

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gobeze, H. B. (2018). Ultrafast Photoinduced Energy and Electron Transfer Studies in Closely Bound Molecular and Nanocarbon Donor-Acceptor Systems. (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc1248516/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gobeze, Habtom Berhane. “Ultrafast Photoinduced Energy and Electron Transfer Studies in Closely Bound Molecular and Nanocarbon Donor-Acceptor Systems.” 2018. Thesis, University of North Texas. Accessed December 12, 2019. https://digital.library.unt.edu/ark:/67531/metadc1248516/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gobeze, Habtom Berhane. “Ultrafast Photoinduced Energy and Electron Transfer Studies in Closely Bound Molecular and Nanocarbon Donor-Acceptor Systems.” 2018. Web. 12 Dec 2019.

Vancouver:

Gobeze HB. Ultrafast Photoinduced Energy and Electron Transfer Studies in Closely Bound Molecular and Nanocarbon Donor-Acceptor Systems. [Internet] [Thesis]. University of North Texas; 2018. [cited 2019 Dec 12]. Available from: https://digital.library.unt.edu/ark:/67531/metadc1248516/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gobeze HB. Ultrafast Photoinduced Energy and Electron Transfer Studies in Closely Bound Molecular and Nanocarbon Donor-Acceptor Systems. [Thesis]. University of North Texas; 2018. Available from: https://digital.library.unt.edu/ark:/67531/metadc1248516/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

27. Daga, Vikram Kumar. Role of Strongly Interacting Additives in Tuning the Structure and Properties of Polymer Systems.

Degree: PhD, Chemical Engineering, 2011, U of Massachusetts : PhD

URL: https://scholarworks.umass.edu/open_access_dissertations/445

► Block copolymer (BCP) nanocomposites are an important class of hybrid materials in which the BCP guides the spatial location and the periodic assembly of… (more)

▼ Block copolymer (BCP) nanocomposites are an important class of hybrid materials in which the BCP guides the spatial location and the periodic assembly of the additives. High loadings of well-dispersed nanofillers are generally important for many applications including mechanical reinforcing of polymers. In particular the composites shown in this work might find use as etch masks in nanolithography, or for enabling various phase selective reactions for new materials development. This work explores the use of hydrogen bonding interactions between various additives (such as homopolymers and non-polymeric additives) and small, disordered BCPs to cause the formation of well-ordered morphologies with small domains. A detailed study of the organization of homopolymer chains and the evolution of structure during the process of ordering is performed. The results demonstrate that by tuning the selective interaction of the additive with the incorporating phase of the BCP, composites with significantly high loadings of additives can be formed while maintaining order in the BCP morphology. The possibility of high and selective loading of additives in one of the phases of the ordered BCP composite opens new avenues due to high degree of functionalization and the proximity of the additives within the incorporating phase. This aspect is utilized in one case for the formation of a network structure between adjoining additive cores to derive mesoporous inorganic materials with their structures templated by the BCP. The concept of additive-driven assembly is extended to formulate BCP-additive blends with an ability to undergo photo-induced ordering. Underlying this strategy is the ability to transition a weakly interacting additive to its strongly interacting form. This strategy provides an on-demand, non-intrusive route for formation of well-ordered nanostructures in arbitrarily defined regions of an otherwise disordered material. The second area explored in this dissertation deals with the incorporation of additives into photoresists for next generation extreme ultra violet (EUV) photolithography applications. The concept of hydrogen bonding between the additives and the polymeric photoresist was utilized to cause formation of a physical network that is expected to slow down the diffusion of photoacid leading to better photolithographic performance (25-30 nm resolution obtained). Advisors/Committee Members: James J. Watkins, Surita R. Bhatia, David M. Ford.

Subjects/Keywords: Block copolymer; Composites; Disorder-to-order transition; Extreme ultra voilet photoresists; Photoinduced ordering; Chemical Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Daga, V. K. (2011). Role of Strongly Interacting Additives in Tuning the Structure and Properties of Polymer Systems. (Doctoral Dissertation). U of Massachusetts : PhD. Retrieved from https://scholarworks.umass.edu/open_access_dissertations/445

Chicago Manual of Style (16^th Edition):

Daga, Vikram Kumar. “Role of Strongly Interacting Additives in Tuning the Structure and Properties of Polymer Systems.” 2011. Doctoral Dissertation, U of Massachusetts : PhD. Accessed December 12, 2019. https://scholarworks.umass.edu/open_access_dissertations/445.

MLA Handbook (7^th Edition):

Daga, Vikram Kumar. “Role of Strongly Interacting Additives in Tuning the Structure and Properties of Polymer Systems.” 2011. Web. 12 Dec 2019.

Vancouver:

Daga VK. Role of Strongly Interacting Additives in Tuning the Structure and Properties of Polymer Systems. [Internet] [Doctoral dissertation]. U of Massachusetts : PhD; 2011. [cited 2019 Dec 12]. Available from: https://scholarworks.umass.edu/open_access_dissertations/445.

Council of Science Editors:

Daga VK. Role of Strongly Interacting Additives in Tuning the Structure and Properties of Polymer Systems. [Doctoral Dissertation]. U of Massachusetts : PhD; 2011. Available from: https://scholarworks.umass.edu/open_access_dissertations/445

28. Patel,Manishkumar B. Supramolecular based heterocyclic assemblies synthesis and application;.

Degree: Chemistry, 2015, Gujarat University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/46334

Abstract Not Available

Data not available

Advisors/Committee Members: Menon,Shobhana K.

Subjects/Keywords: Antimycobacterials; Antioxidants; Calixarenes; Cleavage; Fullerene; Heterocyclic; Photoinduced; Supramolecular

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

B, P. (2015). Supramolecular based heterocyclic assemblies synthesis and application;. (Thesis). Gujarat University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/46334

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

B, Patel,Manishkumar. “Supramolecular based heterocyclic assemblies synthesis and application;.” 2015. Thesis, Gujarat University. Accessed December 12, 2019. http://shodhganga.inflibnet.ac.in/handle/10603/46334.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

B, Patel,Manishkumar. “Supramolecular based heterocyclic assemblies synthesis and application;.” 2015. Web. 12 Dec 2019.

Vancouver:

B P. Supramolecular based heterocyclic assemblies synthesis and application;. [Internet] [Thesis]. Gujarat University; 2015. [cited 2019 Dec 12]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/46334.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

B P. Supramolecular based heterocyclic assemblies synthesis and application;. [Thesis]. Gujarat University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/46334

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

29. Marchesi, Mario Sergio Pereira. Aspectos químicos e fotoquímicos de liberação controlada de óxido nítrico a partir de complexos nitrosilos de rutênio: ensaios farmacológicos e de citotoxicidade.

Degree: PhD, Produtos Naturais e Sintéticos, 2008, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/60/60138/tde-01102008-111056/ ;

►

O óxido nítrico (NO) é um versátil agente biológico, atuando em diversas partes do organismo, tais como cérebro, artérias, sistema imunológico, fígado e pulmões. Alterações… (more)

▼

O óxido nítrico (NO) é um versátil agente biológico, atuando em diversas partes do organismo, tais como cérebro, artérias, sistema imunológico, fígado e pulmões. Alterações nos níveis basais de NO são relacionadas a causas de diversas doenças como hipertenção, câncer, doença de Raymond´s e agregação plaquetária. Visando suprir tal deficiência, mostrou-se de grande valia a obtenção de fármacos capazes de liberar quantidades significativas de NO e de maneira controlada. Uma das possibilidades é o uso de compostos de coordenação, com centro metálico rutênio coordenado ao ligante nitrosil, os quais possuem como característica liberação de NO por estímulo externo. Neste trabalho foram estudados as propriedades químicas, fotoquímicas, farmacológicas e tumoricidas do complexo trans-[RuC(MAC)NO]2+, onde MAC é 1,4,8,11-tetraazaciclotetradecano (cyclam) ou 1,4,8,12-tetraazaciclopentadecano ([15]aneN4), na presença do fotossensibilizador [Ru(NH3)5pz]2+. Os estudos fotoquímicos mostraram que o fotossensibilizador utilizado, [Ru(NH3)5pz]2+, possui tempo de vida no estado excitado de 113 ps, e apresenta processos de transferências eletrônicas e de energia fotoinduzida com o oxigênio molecular, gerando espécies reativas de oxigênio (EROS) como oxigênio singlete e ânion superóxido. Na presença do complexo macrocíclico trans-[RuC(MAC)NO]2+ a irradiação luminosa de [Ru(NH3)5pz]2+ na região do visível proporciona trasferência eletrônica fotoinduzida entre o fotosenssibilizador e o complexo nitrosilo com concomitante formação de NO. O rendimento quântico de NO (NO) é dependente do meio e é de cerca de 10-4 Einstein.mol.cm-1 em meio aquoso sob argônio e 10-2 Einstein.mol.cm-1 em meio oxigenado. Os estudos farmacológicos mostraram que a mistura proposta, em tampão fosfato pH 7,4, promoveu 75% de dilatação em musculatura de aorta pré-contraída com KC enquanto que, quando incorporados em sistemas carreadores de fármacos como emulsão óleo-em-água, HEG gel e membrana sol-gel, promoveram 40%, 35% e 35% de dilatação, respectivamente. A via vasodilatadora foi detectada como sendo pela ativação da GMPc (guanosina monofosfato cíclica), através da quantificação da concentração de cálcio citosólico. Os estudos das atividades anti-tumorais com os complexos doadores de NO foram realizados com linhagens celulares do tipo B16F10, Melan A, HL-60 WMs e Jurkat. Estes experimentos mostraram redução da viabilidade celular dos melanomas entre 50% e 75%, não apresentou ação em células normais (MelanA), mostrando-se seletivos ás células neoplasicas; e 95% de redução da viabilidade celular das células leucêmica (HL-60). Os resultados obtidos e descritos neste trabalho permitem vislumbrar que o uso de espécies doadoras de NO e oxigênio singlete possam ser utilizados no futuro em terapia clínica.

Nitric oxide (NO) is a multipurpose biological agent that shows important role in brain, arteries, immunological system, liver and lungs. The NO basal level alterations have correlation with several diseases as hypertension, cancer, Raymonds disease and platelet…

Advisors/Committee Members: Silva, Roberto Santana da.

Subjects/Keywords: nitric oxide; nitrosilos complexos de rutênio; nitrosyl ruthenium complexes; óxido nítrico; photoinduced electron transfer; transferência eletrônica fotoinduzida

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Marchesi, M. S. P. (2008). Aspectos químicos e fotoquímicos de liberação controlada de óxido nítrico a partir de complexos nitrosilos de rutênio: ensaios farmacológicos e de citotoxicidade. (Doctoral Dissertation). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/60/60138/tde-01102008-111056/ ;

Chicago Manual of Style (16^th Edition):

Marchesi, Mario Sergio Pereira. “Aspectos químicos e fotoquímicos de liberação controlada de óxido nítrico a partir de complexos nitrosilos de rutênio: ensaios farmacológicos e de citotoxicidade.” 2008. Doctoral Dissertation, University of São Paulo. Accessed December 12, 2019. http://www.teses.usp.br/teses/disponiveis/60/60138/tde-01102008-111056/ ;.

MLA Handbook (7^th Edition):

Marchesi, Mario Sergio Pereira. “Aspectos químicos e fotoquímicos de liberação controlada de óxido nítrico a partir de complexos nitrosilos de rutênio: ensaios farmacológicos e de citotoxicidade.” 2008. Web. 12 Dec 2019.

Vancouver:

Marchesi MSP. Aspectos químicos e fotoquímicos de liberação controlada de óxido nítrico a partir de complexos nitrosilos de rutênio: ensaios farmacológicos e de citotoxicidade. [Internet] [Doctoral dissertation]. University of São Paulo; 2008. [cited 2019 Dec 12]. Available from: http://www.teses.usp.br/teses/disponiveis/60/60138/tde-01102008-111056/ ;.

Council of Science Editors:

Marchesi MSP. Aspectos químicos e fotoquímicos de liberação controlada de óxido nítrico a partir de complexos nitrosilos de rutênio: ensaios farmacológicos e de citotoxicidade. [Doctoral Dissertation]. University of São Paulo; 2008. Available from: http://www.teses.usp.br/teses/disponiveis/60/60138/tde-01102008-111056/ ;

Université de Montréal

30. Dion-Bertrand, Laura-Isabelle. Signature optique d’effet Stark dans une bicouche de CuPc:C60 .

Degree: 2015, Université de Montréal

URL: http://hdl.handle.net/1866/11645

► Les hétérojonctions formées de deux matériaux, un donneur et un accepteur (D/A), sont la base de la majorité des mélanges photovoltaïques organiques. Les mécanismes de… (more)

▼ Les hétérojonctions formées de deux matériaux, un donneur et un accepteur (D/A), sont la base de la majorité des mélanges photovoltaïques organiques. Les mécanismes de séparation des charges dans ces systèmes représentent aujourd'hui l'un des sujets les plus chauds et les plus débattus dans ce domaine. Nous entrons au coeur de ce débat en choisissant un système D/A à base de phtalocyanine de cuivre (CuPc) et de fullerène (C60). Pour sonder les états excités de nos molécules et obtenir de l'information sur les phénomènes à l'interface D/A, nous réalisons une expérience pompe-sonde, appelée absorption photoinduite (PIA). Nous y mesurons le changement fractionnaire de transmission au travers de l'échantillon. Les mesures de PIA sont réalisées à l'état de quasi équilibre, à T=10K. Nous observons une modulation prononcée dans la région du photoblanchiment de l'état fondamental qui nous indique que la pompe induit un décalage du spectre d'absorption de l'état fondamental. Ce décalage peut être expliqué par deux processus : soit l'échantillon est chauffé par la pompe (effet thermique) ou bien des charges sont créées à l'interface entre les deux matériaux (effet Stark). La dépendance en température du spectre d'absorption entre 10K et 290K montre une signature thermique pour un changement de température de 80K. Grâce au ratio des raies Raman anti-Stokes et Stokes, nous démontrons que la pompe chauffe l'échantillon de 34 K, température insuffisante pour attribuer notre signal à un effet thermique. Nous évaporons ensuite la bicouche CuPc/C60 sur de l'ITO et du saphir, substrats qui possèdent des conductivités thermiques différentes et nous observons le même signal de PIA, excluant par le fait même l'hypothèse de l'effet thermique. Puisque notre étude est comparable à la spectroscopie à effet Stark, nous procédons à une analyse similaire en comparant notre signal de PIA au spectre de la transmittance et à ses dérivés première et seconde. Nous observons alors que notre signal reproduit presque parfaitement la dérivée seconde de la transmittance. Ces résultats sont conformes à une signature optique d'effet Stark due à la création de charges à l'interface D/A. Advisors/Committee Members: Silva, Carlos (advisor).

Subjects/Keywords: Organique photovoltaïque; Séparation des charges; Hétérojonctions; Mélange donneur/accepteur; Absorption photoinduite; Organic photovoltaic; Charges seperation; Heterojunction; Donor/acceptor system; Photoinduced absorption

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dion-Bertrand, L. (2015). Signature optique d’effet Stark dans une bicouche de CuPc:C60 . (Thesis). Université de Montréal. Retrieved from http://hdl.handle.net/1866/11645

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Dion-Bertrand, Laura-Isabelle. “Signature optique d’effet Stark dans une bicouche de CuPc:C60 .” 2015. Thesis, Université de Montréal. Accessed December 12, 2019. http://hdl.handle.net/1866/11645.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Dion-Bertrand, Laura-Isabelle. “Signature optique d’effet Stark dans une bicouche de CuPc:C60 .” 2015. Web. 12 Dec 2019.

Vancouver:

Dion-Bertrand L. Signature optique d’effet Stark dans une bicouche de CuPc:C60 . [Internet] [Thesis]. Université de Montréal; 2015. [cited 2019 Dec 12]. Available from: http://hdl.handle.net/1866/11645.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Dion-Bertrand L. Signature optique d’effet Stark dans une bicouche de CuPc:C60 . [Thesis]. Université de Montréal; 2015. Available from: http://hdl.handle.net/1866/11645

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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Open Access Theses and Dissertations