You searched for +publisher:"Vanderbilt University" +contributor:("Yaqiong Xu").
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Vanderbilt University
1.
Qin, Kun.
Slow Light Mach-Zehnder Interferometer for Optical Label-free Biosensing.
Degree: MS, Electrical Engineering, 2014, Vanderbilt University
URL: http://hdl.handle.net/1803/12070 
► This work presents the design, fabrication, and characterization of a small footprint Mach-Zehnder interferometer (MZI) that possesses strong light-matter interaction. The demonstrated MZI structure is…
(more)
▼ This work presents the design, fabrication, and characterization of a small footprint Mach-Zehnder interferometer (MZI) that possesses strong light-matter interaction. The demonstrated MZI structure is 400 times smaller than traditional MZI devices and exhibits a one order of magnitude higher detection sensitivity for label-free biosensing applications. The integration of a 1D photonic crystal with a MZI on a silicon-on-insulator platform, performed in this work, leads to the reduced footprint of the MZI (on the order of microns) as well as a high sensitivity of the MZI output spectrum towards refractive index changes based on the slow light effect. In order to achieve the proper design to support the slow light effect, various topologies and sizes of 1D photonic crystals were investigated using finite-difference time-domain analysis. Both traditional 1D photonic crystals and 1D photonic crystals with multiple defect holes structures for biosensing were studied. The highest simulated sensitivity was found to be 223,000 rad/RIU-cm, which is 15 times higher than that of traditional MZI biosensors. The slow light MZI-based sensor devices with the most promising designs were fabricated using standard silicon microelectronics and lab-on-chip microfluidics processing techniques. A bulk refractive index detection sensitivity of 170,000 rad/RIU-cm was experimentally measured using different concentrations of NaCl solution, which is 10 times larger than previously reported results. Specific detection of 16mer DNA molecules was also demonstrated using the slow light MZI platform. Accordingly, slow light MZI-based devices hold great potential for integrated, lab-on-chip sensors with compact form factors and high molecular detection sensitivities.
Advisors/Committee Members: Yaqiong Xu (committee member), Sharon M. Weiss (Committee Chair).
Subjects/Keywords: Slow Light; Biosensing; Mach-Zehnder Interferometer; Photonics
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APA (6th Edition):
Qin, K. (2014). Slow Light Mach-Zehnder Interferometer for Optical Label-free Biosensing. (Thesis). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/12070
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Qin, Kun. “Slow Light Mach-Zehnder Interferometer for Optical Label-free Biosensing.” 2014. Thesis, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/12070.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Qin, Kun. “Slow Light Mach-Zehnder Interferometer for Optical Label-free Biosensing.” 2014. Web. 27 Jan 2021.
Vancouver:
Qin K. Slow Light Mach-Zehnder Interferometer for Optical Label-free Biosensing. [Internet] [Thesis]. Vanderbilt University; 2014. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/12070.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Qin K. Slow Light Mach-Zehnder Interferometer for Optical Label-free Biosensing. [Thesis]. Vanderbilt University; 2014. Available from: http://hdl.handle.net/1803/12070
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Vanderbilt University
2.
Titzel, Howard Charles.
The Investigation of Titanium Dioxide Nanoparticle Films Created through Electrophoretic Deposition.
Degree: MS, Physics, 2011, Vanderbilt University
URL: http://hdl.handle.net/1803/11595
► The development of thin ceramic films has increased in importance throughout the science and industry communities. The distinct characteristics of the strength, transmittance in the…
(more)
▼ The development of thin ceramic films has increased in importance throughout the science and industry communities. The distinct characteristics of the strength, transmittance in the visual spectrum, antimicrobial properties, and high refractive index have led to applications for antimicrobial films in hospitals, antireflection films for glass, and corrosion protection for industrial machinery. The approach to creating ceramic films was to use titanium dioxide nanoparticles suspended in a solution and deposit these particles on a steel substrate through electrophoretic deposition. The use of nanoparticles allows a film to be more uniform, more tightly packed, and have different qualities compared to bulk titanium dioxide. The method to achieve particle sizes less than 30nm for the work in this paper was centrifugation. Suspensions created with these nanopowders were evaluated for particle size, stability, and electrophoretic mobility. However, in each electrophoretic deposition experiment, precipitation inhibited the formation of satisfactory films. Focus turned to the Eu doped TiO2 sol-gel suspensions to try to obtain better films. The films created through dipcasting and through EPD using an ITO substrate produced more promising results. The films obtained through the dipcasting had a much different absorption rate per wavelength varied greatly from the films created through EPD, and both films looked uniform under SEM. This research discusses the size separation by particle size through centrifugation and the creation of nanoparticle thin TiO2 films using electrophoretic deposition.
Advisors/Committee Members: Yaqiong Xu (committee member), James Dickerson (Committee Chair).
Subjects/Keywords: electrophoretic deposition; titanium dioxide; cetrifugation
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APA (6th Edition):
Titzel, H. C. (2011). The Investigation of Titanium Dioxide Nanoparticle Films Created through Electrophoretic Deposition. (Thesis). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/11595
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Titzel, Howard Charles. “The Investigation of Titanium Dioxide Nanoparticle Films Created through Electrophoretic Deposition.” 2011. Thesis, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/11595.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Titzel, Howard Charles. “The Investigation of Titanium Dioxide Nanoparticle Films Created through Electrophoretic Deposition.” 2011. Web. 27 Jan 2021.
Vancouver:
Titzel HC. The Investigation of Titanium Dioxide Nanoparticle Films Created through Electrophoretic Deposition. [Internet] [Thesis]. Vanderbilt University; 2011. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/11595.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Titzel HC. The Investigation of Titanium Dioxide Nanoparticle Films Created through Electrophoretic Deposition. [Thesis]. Vanderbilt University; 2011. Available from: http://hdl.handle.net/1803/11595
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Vanderbilt University
3.
Wrenn, Toshia Lynn.
Synthesis and Optimization of Quantum Dot-Based Technologies: Solid-State Photovoltaics and Ferroelectric Particles.
Degree: PhD, Chemistry, 2015, Vanderbilt University
URL: http://hdl.handle.net/1803/12730
► Meaningful advances in quantum dot-based technologies will require revolutionary advances in synthetic strategies and materials characterization. The development of an all solid-state quantum dot-sensitized solar…
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▼ Meaningful advances in quantum dot-based technologies will require revolutionary advances in synthetic strategies and materials characterization. The development of an all solid-state quantum dot-sensitized solar cell and the synthesis of ferroelectric particles via a simple, room-temperature treatment of quantum dots require a diverse integration of fabrication and characterization techniques.
Analysis of the photovoltaic response and material characterization of quantum dot-sensitized solar cells is used to determine the impact that deposition techniques have on the performance, material integration, and interfacial interactions within an interdigitated photovoltaic device containing a never-before utilized combination of TiO2 nanotubes, PbS quantum dots (QDs), and an conformal ITO film. The QDs are deposited using three different techniques: successive ion layer adsorption and reaction, electrophoretic deposition, and chemical-linking. Deposition of ITO was performed via electrochemically-assisted deposition or electron beam evaporation. Simulated solar illumination and current-voltage measurements show that devices containing chemically-linked PbS QDs and electron beam evaporated ITO generate the highest efficiency (10-3 W/m2) due to better QD-infiltration and more uniform coverage and infiltration of ITO.
Also, a novel synthetic protocol to generate ferroelectric particles, which are frequently utilized for an array of applications including non-volatile memory, renewable energy, and photodetection, by simply combining CdSe QDs with an equimolar solution of antimony trichloride is analyzed. The reaction pathway and projected source of the ferroelectric nature of the particles were assessed by examining untreated CdSe QDs and CdSe QDs treated with antimony trichloride for one minute and for 12 hours. Analysis indicates a two phase chemical reaction: initially Cl- disrupts and removes surface-passivating ligands, subsequently a cation-exchange between Cd and Sb produces anisotropic particles that demonstrate ferroelectric properties.
Advisors/Committee Members: Yaqiong Xu (committee member), Janet Macdonald (committee member), David Cliffel (committee member), Sandra Rosenthal (Committee Chair).
Subjects/Keywords: quantum dots; nanoparticles; photovoltaics; ferroelectric
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APA (6th Edition):
Wrenn, T. L. (2015). Synthesis and Optimization of Quantum Dot-Based Technologies: Solid-State Photovoltaics and Ferroelectric Particles. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/12730
Chicago Manual of Style (16th Edition):
Wrenn, Toshia Lynn. “Synthesis and Optimization of Quantum Dot-Based Technologies: Solid-State Photovoltaics and Ferroelectric Particles.” 2015. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/12730.
MLA Handbook (7th Edition):
Wrenn, Toshia Lynn. “Synthesis and Optimization of Quantum Dot-Based Technologies: Solid-State Photovoltaics and Ferroelectric Particles.” 2015. Web. 27 Jan 2021.
Vancouver:
Wrenn TL. Synthesis and Optimization of Quantum Dot-Based Technologies: Solid-State Photovoltaics and Ferroelectric Particles. [Internet] [Doctoral dissertation]. Vanderbilt University; 2015. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/12730.
Council of Science Editors:
Wrenn TL. Synthesis and Optimization of Quantum Dot-Based Technologies: Solid-State Photovoltaics and Ferroelectric Particles. [Doctoral Dissertation]. Vanderbilt University; 2015. Available from: http://hdl.handle.net/1803/12730
Vanderbilt University
4.
He, Shenglai.
Electron Transport on the Nanoscale.
Degree: PhD, Physics, 2017, Vanderbilt University
URL: http://hdl.handle.net/1803/14207
► Novel nano electronic devices are necessary in order to continue the advancement of computational power of microprocessors in the next decades. On the theory side,…
(more)
▼ Novel nano electronic devices are necessary in order to continue the advancement of computational power of microprocessors in the next decades. On the theory side, it is an open boundary system and usually modeled as a device region connected to semi-infinite electrodes. The general task is to calculate the transport properties and the most common approach is based on the Landauer formalism combined with density functional theory (DFT). However, DFT is strictly a ground state theory. The transport problem is a dynamic process and usually involves excited states. Therefore, Time-dependent DFT (TDDFT) is a more suitable method to describe the transport property. In addition, as devices get ever smaller, approaching nano scale, the study of spatial dependency of electron transport is important, as it unveils the electron pathway through the structure and can help us better understand the overall transport properties. In this dissertation, we use TDDFT to investigate the local electron transport in nanomaterials
Advisors/Committee Members: Sait Umar (committee member), Yaqiong Xu (committee member), Greg Walker (committee member), Kalman Varga (Committee Chair).
Subjects/Keywords: TDDFT; Electron transport; Nanoscale; Graphene nanoribbons
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APA (6th Edition):
He, S. (2017). Electron Transport on the Nanoscale. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/14207
Chicago Manual of Style (16th Edition):
He, Shenglai. “Electron Transport on the Nanoscale.” 2017. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/14207.
MLA Handbook (7th Edition):
He, Shenglai. “Electron Transport on the Nanoscale.” 2017. Web. 27 Jan 2021.
Vancouver:
He S. Electron Transport on the Nanoscale. [Internet] [Doctoral dissertation]. Vanderbilt University; 2017. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/14207.
Council of Science Editors:
He S. Electron Transport on the Nanoscale. [Doctoral Dissertation]. Vanderbilt University; 2017. Available from: http://hdl.handle.net/1803/14207
Vanderbilt University
5.
Jackson, Enrique Monte.
Development and Thermal Properties of Carbon Nanotube-Polymer Composites.
Degree: PhD, Interdisciplinary Materials Science, 2014, Vanderbilt University
URL: http://hdl.handle.net/1803/14782
► The favorable conductive properties of carbon nanotubes (CNTs) offer opportunities for constructing CNT-based nanocomposites with improved thermal conduction for a range of potential applications. Such…
(more)
▼ The favorable conductive properties of carbon nanotubes (CNTs) offer opportunities for constructing CNT-based nanocomposites with improved thermal conduction for a range of potential applications. Such lightweight composite materials are expected to have thermal properties that depend on their CNT volume fraction and operating temperature. The construction of CNT-based nanocomposites is challenged by the available processing methods for CNTs that are compatible with the construction of multi-laminated composite structures.
The overall goal of this effort is to develop enhanced thermal properties in carbon nanotube-polymer composites that can replace traditional aerospace metallic materials to reduce the weight in space structures. The key innovation of this dissertation is in dispersing the carbon nanotubes onto a prepreg composite structure that sustains thermal storage and increase the thermal transport to support scientific instrumentation to more effectively radiate heat from a composite structure while increasing the thermal properties. The employed structures consisted of individual plies of IM7 prepreg composite with an embedded 8552 epoxy that were each coated with a CNT layer and then combined into the final composite structure using a vacuum-based hand layup technique for curing the 8552 epoxy. The composites were investigated by Raman spectroscopy, thermogravimetric analysis, thermal diffusivity, and differential scanning calorimetry.
With varying the concentration of SWCNT up to 30 wt% to the IM7 prepreg composite, its heat capacity sustained over the tested temperature range and its through-thickness thermal diffusivity increased by 30% vs. the virgin composite material. By modeling, such additions of randomly oriented SWCNTs are suggested to increase the in-plane thermal conductivity by 120 to 150% over the temperature range of 120 to 470 K and by 30% in the through-thickness direction. A possible explanation of these improvements in the thermal conductivities are the reductions of the interfacial resistances between the SWCNTs, the 8552 epoxy, and the IM7 composite.
The developed methods provide the opportunity for enhancing the thermal properties of a composite through the use of CNTs as additives. Such improvements would be particularly useful in aerospace applications for solar arrays, fairings, and thermal radiators.
Advisors/Committee Members: Dr. Yaqiong Xu (committee member), Dr. Timothy Hanusa (committee member), Dr. Paul Laibinis (Committee Chair).
Subjects/Keywords: carbon nanotubes; composites; thermal conductivity
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APA (6th Edition):
Jackson, E. M. (2014). Development and Thermal Properties of Carbon Nanotube-Polymer Composites. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/14782
Chicago Manual of Style (16th Edition):
Jackson, Enrique Monte. “Development and Thermal Properties of Carbon Nanotube-Polymer Composites.” 2014. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/14782.
MLA Handbook (7th Edition):
Jackson, Enrique Monte. “Development and Thermal Properties of Carbon Nanotube-Polymer Composites.” 2014. Web. 27 Jan 2021.
Vancouver:
Jackson EM. Development and Thermal Properties of Carbon Nanotube-Polymer Composites. [Internet] [Doctoral dissertation]. Vanderbilt University; 2014. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/14782.
Council of Science Editors:
Jackson EM. Development and Thermal Properties of Carbon Nanotube-Polymer Composites. [Doctoral Dissertation]. Vanderbilt University; 2014. Available from: http://hdl.handle.net/1803/14782
Vanderbilt University
6.
Oakes, Landon Joseph.
Controlling Nanomaterial Assembly to Improve Material Performance in Energy Storage Electrodes.
Degree: PhD, Interdisciplinary Materials Science, 2016, Vanderbilt University
URL: http://hdl.handle.net/1803/14085
► Nanomaterials have enabled significant breakthroughs in energy storage capabilities. In particular, the use of nanoscale components in lithium-sulfur and lithium-oxygen batteries have generated energy densities…
(more)
▼ Nanomaterials have enabled significant breakthroughs in energy storage capabilities. In particular, the use of nanoscale components in lithium-sulfur and lithium-oxygen batteries have generated energy densities 2-3x greater than today’s lithium-ion batteries. However, a major roadblock to commercially viable applications of nanomaterials is the ability to cost-effectively manufacture electrode-scale films while still maintaining precise control over the nanoscale morphology. In this regard, electrophoretic deposition (EPD) provides a promising tool for large-scale manufacture of nanomaterial systems using conventional liquid processing techniques. During EPD, the use of electrochemical equilibria to stabilize suspensions of nanomaterials eliminates the need for additives and provides a mechanism to control the placement of individual nanostructures on both 2D and 3D substrates through the application of an electric field. The viability of this process for large scale manufacture is demonstrated by integrating EPD electrode fabrication with nanomaterial synthesis processes on a benchtop roll-to-roll platform. Using this approach, lithium-sulfur and lithium-oxygen electrodes are fabricated that demonstrate enhanced mass-specific performance compared with identical material compositions assembled using conventional techniques. For lithium-oxygen batteries, the role that catalyst assembly plays in dictating the performance of the battery is elucidated and improved through EPD. Likewise, for lithium-sulfur batteries, the coating of an elemental sulfur layer is engineered in conjunction with an all-carbon EPD assembled electrode to produce one of highest capacity and most reversible lithium-sulfur cathodes ever reported. Overall, this thesis demonstrates the role of nanomaterial assembly in determining the energy storage performance of electrode-scale films and presents a method to control this assembly that is amenable to large-scale manufacture.
Advisors/Committee Members: Cary Pint (committee member), Rizia Bardhan (committee member), Jason Valentine (committee member), Yaqiong Xu (committee member), Paul Laibinis (committee member).
Subjects/Keywords: Battery; electrophoretic deposition; nanomanufacturing; roll-to-roll; lithium-sulfur; lithium-oxygen; lithium-ion
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APA (6th Edition):
Oakes, L. J. (2016). Controlling Nanomaterial Assembly to Improve Material Performance in Energy Storage Electrodes. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/14085
Chicago Manual of Style (16th Edition):
Oakes, Landon Joseph. “Controlling Nanomaterial Assembly to Improve Material Performance in Energy Storage Electrodes.” 2016. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/14085.
MLA Handbook (7th Edition):
Oakes, Landon Joseph. “Controlling Nanomaterial Assembly to Improve Material Performance in Energy Storage Electrodes.” 2016. Web. 27 Jan 2021.
Vancouver:
Oakes LJ. Controlling Nanomaterial Assembly to Improve Material Performance in Energy Storage Electrodes. [Internet] [Doctoral dissertation]. Vanderbilt University; 2016. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/14085.
Council of Science Editors:
Oakes LJ. Controlling Nanomaterial Assembly to Improve Material Performance in Energy Storage Electrodes. [Doctoral Dissertation]. Vanderbilt University; 2016. Available from: http://hdl.handle.net/1803/14085
Vanderbilt University
7.
Cook, Brandon Girard.
Quantum transport in nanodevices.
Degree: PhD, Physics, 2012, Vanderbilt University
URL: http://hdl.handle.net/1803/13739
► First-principles simulations of quantum transport in nano-devices are presented in this dissertation. First, the extension of the complex absorbing potential quantum transport framework to the…
(more)
▼ First-principles simulations of quantum transport in nano-devices are presented in this dissertation. First, the extension of the complex absorbing potential quantum transport framework to the general case of N electrodes is developed. This framework is used with density functional theory to investigate, grids of nanowires, graphene cross junctions and a six terminal carbon nanotube device. Quantum interference between possible paths for electrons was found to have a pronounced effect in multi-terminal systems. The charge transport properties of kinked nanowires, kinked graphene nanoribbons, elongated gold nanowires and a molecular junction with gold electrodes are analyzed with density functional and transport calculations. The simulations show the importance of atomic features and highlight the care needed to create functional devices, particularly in the case of kinked structures. Finally, interfaces between graphene and carbon nanotubes and graphene and MoS2 are studied. In the case of graphene-carbon nanotube junctions the p-type Schottky barrier was found to be low compared to the barrier in standard Palladium-nanotube junctions. Graphene was found to be a favorable electrode material for the injection of electrons into MoS2 due to the low potential barrier and presence of delocalized states near the Fermi energy. In addition to the analysis of these physical systems, a number of advanced computational algorithms were developed.
Advisors/Committee Members: Yaqiong Xu (committee member), Kirill Bolotin (committee member), David Ernst (committee member), Sokrates Pantelides (committee member), Kalman Varga (Committee Chair).
Subjects/Keywords: density functional theory; quantum electron transport
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APA (6th Edition):
Cook, B. G. (2012). Quantum transport in nanodevices. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/13739
Chicago Manual of Style (16th Edition):
Cook, Brandon Girard. “Quantum transport in nanodevices.” 2012. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/13739.
MLA Handbook (7th Edition):
Cook, Brandon Girard. “Quantum transport in nanodevices.” 2012. Web. 27 Jan 2021.
Vancouver:
Cook BG. Quantum transport in nanodevices. [Internet] [Doctoral dissertation]. Vanderbilt University; 2012. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/13739.
Council of Science Editors:
Cook BG. Quantum transport in nanodevices. [Doctoral Dissertation]. Vanderbilt University; 2012. Available from: http://hdl.handle.net/1803/13739
Vanderbilt University
8.
McGahan, Christina Lynn.
Interactions of Gold Plasmons and Vanadium Dioxide.
Degree: PhD, Physics, 2017, Vanderbilt University
URL: http://hdl.handle.net/1803/11551
► The focus of this dissertation is the interaction of gold (Au) plasmonic structures and the phase change material vanadium dioxide (VO2). Vanadium dioxide modifies the…
(more)
▼ The focus of this dissertation is the interaction of gold (Au) plasmonic structures and the phase change material vanadium dioxide (VO2). Vanadium dioxide modifies the local surface plasmon resonance of an Au nanoparticles and the local surface plasmon can also act as a probe of the VO2 optical properties. Heterostructures combining plasmonic and phase-change materials create platforms with tunable optical properties that provide access to a cornucopia of optical-physics phenomena. In this thesis we specifically look at three such phenomena. First, we demonstrate active plasmon-induced transparency via finite-difference time-domain simulations and investigate an experimental realization of the relevant structure that exhibit plasmon-induced transparency. Second, we observe a novel pattern of coexisting metallic and insulating domains in a VO2 single crystal using plasmonic antennas in a scattering scanning near-field optical microscope, and thus show that even single VO2 crystals are not homogeneous. Third, we employ the optical resonance shifts of plasmonic monomers and dimers embedded in VO2 films to probe the kinetics and dynamics of atomic hydrogen diffusion and its effects on the phase transition. In addition, the challenges inherent in fabricating these complex structures are discussed, illuminating the ways in which the choice of thin-film deposition method influence the resulting VO2 material properties. This work demonstrates the versatility of hybrid material platforms that combine the exquisite optical sensitivity of the surface plasmon resonance with the tunable dielectric functions in phase-changing materials to study the kinetics and dynamics of strong correlations, doping interactions, and classical analogs of atomic phenomena in solid-state systems.
Advisors/Committee Members: David E. Cliffel (committee member), Jason G. Valentine (committee member), Kalman Varga (committee member), Yaqiong Xu (committee member), Richard F. Haglund (Committee Chair).
Subjects/Keywords: phase change material; nanoparticle; single crystal; hydrogen doping; active plasmonics; phase coexistence; vanadium dioxide; plasmon
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APA (6th Edition):
McGahan, C. L. (2017). Interactions of Gold Plasmons and Vanadium Dioxide. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/11551
Chicago Manual of Style (16th Edition):
McGahan, Christina Lynn. “Interactions of Gold Plasmons and Vanadium Dioxide.” 2017. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/11551.
MLA Handbook (7th Edition):
McGahan, Christina Lynn. “Interactions of Gold Plasmons and Vanadium Dioxide.” 2017. Web. 27 Jan 2021.
Vancouver:
McGahan CL. Interactions of Gold Plasmons and Vanadium Dioxide. [Internet] [Doctoral dissertation]. Vanderbilt University; 2017. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/11551.
Council of Science Editors:
McGahan CL. Interactions of Gold Plasmons and Vanadium Dioxide. [Doctoral Dissertation]. Vanderbilt University; 2017. Available from: http://hdl.handle.net/1803/11551
Vanderbilt University
9.
Zhang, Xin.
THERMORESPONSIVE TRANSIENT ELECTRONIC SYSTEMS AND
MICROFLUIDIC DEVICES FOR BIOMEDICAL APPLICATIONS.
Degree: PhD, Mechanical Engineering, 2019, Vanderbilt University
URL: http://hdl.handle.net/1803/14331
► There has been a push to develop novel materials and devices that are well-suited for diverse biomedical applications. Examples of emerging technologies that exhibit promising…
(more)
▼ There has been a push to develop novel materials and devices that are well-suited for diverse biomedical applications. Examples of emerging technologies that exhibit promising potential to advance current healthcare systems include transient electronics and microfluidics. By leveraging novel fabrication techniques and device architecture, there are opportunities to expand the utility of those technologies in a way that is not previously possible. In this dissertation, efforts are devoted to developing thermally triggered transient systems and simple yet efficient microfluidic devices for applications such as retrieval-free medical implant and high-yielding radiotracer synthesis for positron emission tomography (PET), respectively. For thermally triggered transient system, I focus on a class of thermoresponsive polymer that exhibits lower critical solution temperature (LCST) behavior. Different from previous dissolvable transient systems, developed thermoresponsive transient devices including conductors, capacitors, antennas, and LED circuits can function stably in warm water but stop working and physically disintegrate upon a cooling stimulus. As a result, triggered transience can be realized as needed by controlling external temperature. For microfluidics-aided radiotracer synthesis, I develop two different microfluidic devices for synthesis of different radiotracers, [18F]fallypride and [68Ga]PSMA. By employing developed microfluidic chips, complete production of desired radiotracers is successfully achieved with sufficient amount of radioactivity for human PET imaging. In addition, on-chip synthesized [68Ga]PSMA meets all requirements for direct patient injection, which represents an exciting advance of applying microfluidics for routinely clinical use. In summary, thermoresonsive transient systems and microfluidic devices presented in this dissertation expand the scope and capability of established technologies, implying promising potential for next-generation biomedical applications.
Advisors/Committee Members: Charles Manning (committee member), Greg Walker (committee member), Yaqiong Xu (committee member), Deyu Li (committee member), Leon Bellan (Committee Chair).
Subjects/Keywords: Transient electronics; RF antenna; microfluidic devices
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APA (6th Edition):
Zhang, X. (2019). THERMORESPONSIVE TRANSIENT ELECTRONIC SYSTEMS AND
MICROFLUIDIC DEVICES FOR BIOMEDICAL APPLICATIONS. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/14331
Chicago Manual of Style (16th Edition):
Zhang, Xin. “THERMORESPONSIVE TRANSIENT ELECTRONIC SYSTEMS AND
MICROFLUIDIC DEVICES FOR BIOMEDICAL APPLICATIONS.” 2019. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/14331.
MLA Handbook (7th Edition):
Zhang, Xin. “THERMORESPONSIVE TRANSIENT ELECTRONIC SYSTEMS AND
MICROFLUIDIC DEVICES FOR BIOMEDICAL APPLICATIONS.” 2019. Web. 27 Jan 2021.
Vancouver:
Zhang X. THERMORESPONSIVE TRANSIENT ELECTRONIC SYSTEMS AND
MICROFLUIDIC DEVICES FOR BIOMEDICAL APPLICATIONS. [Internet] [Doctoral dissertation]. Vanderbilt University; 2019. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/14331.
Council of Science Editors:
Zhang X. THERMORESPONSIVE TRANSIENT ELECTRONIC SYSTEMS AND
MICROFLUIDIC DEVICES FOR BIOMEDICAL APPLICATIONS. [Doctoral Dissertation]. Vanderbilt University; 2019. Available from: http://hdl.handle.net/1803/14331
Vanderbilt University
10.
Zhang, Qian.
Thermal transport in individual nanowires of fine structures.
Degree: PhD, Mechanical Engineering, 2017, Vanderbilt University
URL: http://hdl.handle.net/1803/12866
► In the past two decades, nanowires have attracted a lot of attention because of their novel physical properties and promising applications. This dissertation explores thermal…
(more)
▼ In the past two decades, nanowires have attracted a lot of attention because of their novel physical properties and promising applications. This dissertation explores thermal properties of several different kinds of nanowires of complex structures. First, to enhance the measurement sensitivity, the experimental set-up was modified based on a common-mode rejection scheme, which extended the lower limit of measurable thermal conductance down to ~10 pW/K. Utilizing this more powerful scheme, we investigated thermal transport through individual electrospun polyethylene (PE) nanofibers, boron carbide nanowires, and quasi-one-dimensional (quasi-1D) van der Waals (vdW) Ta2Pd3Se8 nanowires, together with thorough structural characterizations to establish structure-transport property relations. It has been shown that the electrospun PE nanofibers can have much higher thermal conductivity than the bulk value because of the highly ordered molecular orientation as disclosed by Raman spectroscopy. In general, the thermal conductivity of PE nanofibers increases with the electrospun voltage because the more aligned structure of nanofibers prepared at higher voltage. For single crystalline boron carbide nanowires, the measurements show a general trend of higher thermal conductivity as the carbon concentration and wire diameter increase, while no significant dependence on the stacking fault orientation and density has been observed. Importantly, the results show that kinks can pose remarkable resistance to thermal transport, which has been attributed to the combined effects of backscattering of highly focused phonons in boron carbides and required mode conversion at the kink. Interestingly, we show that defects in the kink, instead of posing resistance, actually facilitate phonon transport across the kink and reduce its resistance. Lastly, the thermal conductivity of exfoliated single crystalline quasi-1D vdW Ta2Pd3Se8 nanowires have been investigated. The results indicate an interesting size dependence of the thermal conductivity on both the wire diameter and sample length, which suggests important contributions of phonons both along and not-along the molecular chains. Up to 13 µm ballistic transport along the molecular chain at room temperature has been observed, which represents one of the longest observed ballistic transport so far. In summary, the novel observations presented in this dissertation disclose intriguing interactions between complex molecular structures and nanowire morphologies, which provides new insights into tuning the nanowire thermal properties.
Advisors/Committee Members: D. Greg Walker (committee member), Weng Poo Kang (committee member), Robert W. Pitz (committee member), Yaqiong Xu (committee member), Deyu Li (Committee Chair).
Subjects/Keywords: Thermal Conductivity; Nanowires; Van der Waals crystals; Kink
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APA (6th Edition):
Zhang, Q. (2017). Thermal transport in individual nanowires of fine structures. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/12866
Chicago Manual of Style (16th Edition):
Zhang, Qian. “Thermal transport in individual nanowires of fine structures.” 2017. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/12866.
MLA Handbook (7th Edition):
Zhang, Qian. “Thermal transport in individual nanowires of fine structures.” 2017. Web. 27 Jan 2021.
Vancouver:
Zhang Q. Thermal transport in individual nanowires of fine structures. [Internet] [Doctoral dissertation]. Vanderbilt University; 2017. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/12866.
Council of Science Editors:
Zhang Q. Thermal transport in individual nanowires of fine structures. [Doctoral Dissertation]. Vanderbilt University; 2017. Available from: http://hdl.handle.net/1803/12866
Vanderbilt University
11.
Lo, Ming Gai Stanley.
Ring-Shaped Silicon Photonic Crystal Structures
for Bio-Sensing and Optical-Interconnects.
Degree: PhD, Electrical Engineering, 2018, Vanderbilt University
URL: http://hdl.handle.net/1803/10705
► In the last decade, the field of silicon photonics has emerged as a promising optical platform for applications such as optical-interconnects, telecommunications and sensing. In…
(more)
▼ In the last decade, the field of silicon photonics has emerged as a promising optical platform for applications such as optical-interconnects, telecommunications and sensing. In order to advance these technologies, development and implementation of new photonic structures is required. In this dissertation, two classes of novel ring-shaped nano-photonic structures with attractive optical characteristics are presented: (1) photonic crystal microring resonators and (2) embedded one-dimensional photonic crystal cavities.
The photonic crystal microring resonator (PhCR) is first demonstrated for label-free biosensing, showing superior sensitivity over traditional ring resonator sensors due to enhanced light-matter interaction in the active sensing regions. Based on their unique optical mode patterns, PhCRs are further demonstrated to have the capability to select specific Bloch modes in the photonic crystal cavity, opening up the design freedom to achieve advanced optical-interconnect components including multiplexers and add-drop filters. A new broad-band coupling approach to PhCRs is also demonstrated by employing chirped photonic crystal mode converters.
The embedded one-dimensional photonic crystal cavity (EPhCC) is introduced and demonstrated as a promising photonic structure for wavelength-division multiplexing applications. By employing a shifted-hole design, some of the radiation losses due to coupling channels can be compensated. In experiments, a loaded quality factor of ~52,000 is measured, providing 2-fold enhancement over a traditional one-dimensional photonic crystal with similar dimensions.
Advisors/Committee Members: Ronald Schrimpf (committee member), Jason Valentine (committee member), Sharon Weiss (committee member), Yaqiong Xu (committee member), Philippe Fauchet (Committee Chair).
Subjects/Keywords: Silicon Photonics; Optics; Optical Resonators
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APA (6th Edition):
Lo, M. G. S. (2018). Ring-Shaped Silicon Photonic Crystal Structures
for Bio-Sensing and Optical-Interconnects. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/10705
Chicago Manual of Style (16th Edition):
Lo, Ming Gai Stanley. “Ring-Shaped Silicon Photonic Crystal Structures
for Bio-Sensing and Optical-Interconnects.” 2018. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/10705.
MLA Handbook (7th Edition):
Lo, Ming Gai Stanley. “Ring-Shaped Silicon Photonic Crystal Structures
for Bio-Sensing and Optical-Interconnects.” 2018. Web. 27 Jan 2021.
Vancouver:
Lo MGS. Ring-Shaped Silicon Photonic Crystal Structures
for Bio-Sensing and Optical-Interconnects. [Internet] [Doctoral dissertation]. Vanderbilt University; 2018. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/10705.
Council of Science Editors:
Lo MGS. Ring-Shaped Silicon Photonic Crystal Structures
for Bio-Sensing and Optical-Interconnects. [Doctoral Dissertation]. Vanderbilt University; 2018. Available from: http://hdl.handle.net/1803/10705
Vanderbilt University
12.
Hu, Shuren.
Engineering Light-matter Interaction in Dielectric Nanophotonic Resonators.
Degree: PhD, Physics, 2016, Vanderbilt University
URL: http://hdl.handle.net/1803/15333
► Engineering light-matter interaction at the nanoscale has the promise to enable technological advances in a wide range of technological applications, including biomolecular sensing, communication, quantum…
(more)
▼ Engineering light-matter interaction at the nanoscale has the promise to enable technological advances in a wide range of technological applications, including biomolecular sensing, communication, quantum optics, displays, optomechanics, and optical trapping. In this thesis, enhanced light-matter interaction through simulation, design, fabrication, and characterization of dielectric nanophotonic resonators is explored. Based on an analysis of Maxwell’s equations, three key parameters that govern light-matter interaction are highlighted: (i) change in refractive index, (ii) modal overlap, (iii) and optical field strength. Enhancement of light-matter interaction through these avenues is studied with a particular focus on practical applications. First, a new method to increase the refractive index change in optical biosensors is presented, which overcomes the challenge of having a limited number of bioreceptor binding sites on label-free nanophotonic biosensors. It is shown that an in-situ synthesis technique for attaching bioreceptors to silicon photonic sensors produces at least 5 times higher bioreceptor surface density than traditional approaches, leading to amplified sensing signals, due to larger refractive index changes, and faster sensor response times. Next, a suspended TM microring resonator biosensor is demonstrated with improved light-matter interaction through increased modal overlap. Suspending the resonator allows biomolecules to access the underside of the resonator and also delocalizes the optical resonance mode; these effects lead to a 3-fold increase in bulk detection sensitivity and the label-free detection of Herceptin, a breast cancer therapeutic, at a clinically relevant 100 nM concentration. Finally, increased light-matter interaction through enhanced optical field strength is achieved using a de novo design method that strategically modifies the unit cell of photonic crystals. Through both finite-difference time-domain simulations and experiments, a high quality factor (Q ~ 10
6) bowtie-shaped silicon photonic crystal resonator with deep subwavelength mode volume (Vm ~ 10
-3(/n
si)
3) is demonstrated. This Q/Vm metric is the largest reported to date.
Advisors/Committee Members: Norman H Tolk (committee member), Jason Valentine (committee member), Yaqiong Xu (committee member), Richard F. Haglund (committee member), Sharon M. Weiss (Committee Chair).
Subjects/Keywords: dielectric resonator; photonic crystal; resonator; nanotechnology; photonics; optics
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APA ·
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MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Hu, S. (2016). Engineering Light-matter Interaction in Dielectric Nanophotonic Resonators. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/15333
Chicago Manual of Style (16th Edition):
Hu, Shuren. “Engineering Light-matter Interaction in Dielectric Nanophotonic Resonators.” 2016. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/15333.
MLA Handbook (7th Edition):
Hu, Shuren. “Engineering Light-matter Interaction in Dielectric Nanophotonic Resonators.” 2016. Web. 27 Jan 2021.
Vancouver:
Hu S. Engineering Light-matter Interaction in Dielectric Nanophotonic Resonators. [Internet] [Doctoral dissertation]. Vanderbilt University; 2016. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/15333.
Council of Science Editors:
Hu S. Engineering Light-matter Interaction in Dielectric Nanophotonic Resonators. [Doctoral Dissertation]. Vanderbilt University; 2016. Available from: http://hdl.handle.net/1803/15333
Vanderbilt University
13.
Wei, Xing.
Porous silicon waveguide biosensors with a grating coupler.
Degree: PhD, Electrical Engineering, 2012, Vanderbilt University
URL: http://hdl.handle.net/1803/11427
► Sensitive label-free optical biosensors based on grating-coupled porous silicon (PSi) waveguides are demonstrated for biosensing applications. This is the first time that the benefits of…
(more)
▼ Sensitive label-free optical biosensors based on grating-coupled porous silicon (PSi) waveguides are demonstrated for biosensing applications. This is the first time that the benefits of both PSi and diffraction gratings have been combined for the detection of small molecules. The large surface area and strong field confinement in the waveguide region where biomolecules are immobilized make it possible to detect biomolecule interactions with high sensitivity. Diffraction gratings provide a simple, convenient, and effective means of coupling light into the waveguide for DNA hybridization experiments. Through both experiments and theoretical calculations, it was shown that an all-PSi grating-coupled waveguide biosensor exhibits a more than 30-fold larger signal response for small molecule detection compared to planar waveguide sensors. Kinetics parameters of different sized molecules in nanoscale pores were also determined for the first time using PDMS flow cell integrated PSi grating-coupled waveguides.
Advisors/Committee Members: Bharat L. Bhuva (committee member), Deyu Li (committee member), Ronald D. Schrimpf (committee member), Yaqiong Xu (committee member), Sharon M. Weiss (Committee Chair).
Subjects/Keywords: gratings; optical biosensor; Porous silicon; waveguide
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Export
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APA (6th Edition):
Wei, X. (2012). Porous silicon waveguide biosensors with a grating coupler. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/11427
Chicago Manual of Style (16th Edition):
Wei, Xing. “Porous silicon waveguide biosensors with a grating coupler.” 2012. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/11427.
MLA Handbook (7th Edition):
Wei, Xing. “Porous silicon waveguide biosensors with a grating coupler.” 2012. Web. 27 Jan 2021.
Vancouver:
Wei X. Porous silicon waveguide biosensors with a grating coupler. [Internet] [Doctoral dissertation]. Vanderbilt University; 2012. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/11427.
Council of Science Editors:
Wei X. Porous silicon waveguide biosensors with a grating coupler. [Doctoral Dissertation]. Vanderbilt University; 2012. Available from: http://hdl.handle.net/1803/11427
Vanderbilt University
14.
Ryckman, Judson Douglas.
Porous and phase change nanomaterials for photonic applications.
Degree: PhD, Electrical Engineering, 2013, Vanderbilt University
URL: http://hdl.handle.net/1803/12182
► The field of nanophotonics has emerged as a promising platform for applications ranging from communications and computing, to sensing, solar energy harvesting, biomedicine, and beyond.…
(more)
▼ The field of nanophotonics has emerged as a promising platform for applications ranging from communications and computing, to sensing, solar energy harvesting, biomedicine, and beyond. Advancing these technologies requires developing and implementing new material systems, designs, and fabrication strategies. This dissertation focuses on two classes of nanomaterials with attractive optical characteristics: (1) porous nanomaterials and (2) phase change nanomaterials. Direct imprinting of porous subtrates (DIPS) is first introduced and demonstrated for the low-cost fabrication of micro- and nano-structures in porous media, including plasmonic or diffraction based sensors and porous microparticles relevant to drug delivery and imaging. DIPS is further demonstrated for 3D surface patterning and morphological control over local material properties. Second, the phase change nanomaterial vanadium dioxide (VO2) is integrated with silicon photonic components and a new ultra-compact platform for constructing active optical devices is demonstrated. With the hybrid Si-VO2 platform, record values of optically induced phase modulation and absorption modulation are achieved. The slotted photonic crystal nanobeam is also introduced and a low-mode volume nanocavity is demonstrated as an ultra-compact device for enhancing light-matter interactions, thus promoting further improvements to device footprint, sensitivity, and efficiency.
Advisors/Committee Members: Richard F. Haglund, Jr. (committee member), Dan Fleetwood (committee member), Ron Schrimpf (committee member), Yaqiong Xu (committee member), Sharon M. Weiss (Committee Chair).
Subjects/Keywords: cavity; vanadium dioxide; porous silicon; photonics; imprint; mode volume; slotted nanobeam
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APA (6th Edition):
Ryckman, J. D. (2013). Porous and phase change nanomaterials for photonic applications. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/12182
Chicago Manual of Style (16th Edition):
Ryckman, Judson Douglas. “Porous and phase change nanomaterials for photonic applications.” 2013. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/12182.
MLA Handbook (7th Edition):
Ryckman, Judson Douglas. “Porous and phase change nanomaterials for photonic applications.” 2013. Web. 27 Jan 2021.
Vancouver:
Ryckman JD. Porous and phase change nanomaterials for photonic applications. [Internet] [Doctoral dissertation]. Vanderbilt University; 2013. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/12182.
Council of Science Editors:
Ryckman JD. Porous and phase change nanomaterials for photonic applications. [Doctoral Dissertation]. Vanderbilt University; 2013. Available from: http://hdl.handle.net/1803/12182
Vanderbilt University
15.
Wang, Rui.
Hybrid Nanostructured Materials for Bioengineering Applications.
Degree: PhD, Physics, 2018, Vanderbilt University
URL: http://hdl.handle.net/1803/12611
► Nanomaterial research is developed from material science to broad nanotechnology, which leverages advances in material metrology and synthesis in support of microfabrication research. Particularly, carbon…
(more)
▼ Nanomaterial research is developed from material science to broad nanotechnology, which leverages advances in material metrology and synthesis in support of microfabrication research. Particularly, carbon nanotubes (CNTs), graphene and molybdenum disulfide (MoS2) process their own unique optical, electronic and mechanical properties, allowing for a large variety of applications, such as sensors, solar cells, displays, batteries and supercapacitors.
This dissertation focuses on hybridized structures and bioengineering applications of nanomaterials. We start introducing the advanced synthesis approaches of two hybrids, CNT/graphene and CNT/MoS2, followed by the Raman, electronical and optoelectronic characterizations. Finally, under scanning photocurrent microscopy, we integrate graphene probes with the glia-neuron co-culture microfluidic platforms to investigate the synaptic activity. Our achievement of developing innovative hybrids and applying nanomaterials into bioengineering fields will provide new ways for future electronic, optoelectronic and biosensing applications.
Advisors/Committee Members: Deyu Li (committee member), Sharon Weiss (committee member), Sait A. Umar (committee member), Ronald D. Schrimpf (committee member), Yaqiong Xu (Committee Chair).
Subjects/Keywords: bioengineering; sensors; optoelectronics; hybrids; nanomaterial; chemical vapor deposition
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APA (6th Edition):
Wang, R. (2018). Hybrid Nanostructured Materials for Bioengineering Applications. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/12611
Chicago Manual of Style (16th Edition):
Wang, Rui. “Hybrid Nanostructured Materials for Bioengineering Applications.” 2018. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/12611.
MLA Handbook (7th Edition):
Wang, Rui. “Hybrid Nanostructured Materials for Bioengineering Applications.” 2018. Web. 27 Jan 2021.
Vancouver:
Wang R. Hybrid Nanostructured Materials for Bioengineering Applications. [Internet] [Doctoral dissertation]. Vanderbilt University; 2018. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/12611.
Council of Science Editors:
Wang R. Hybrid Nanostructured Materials for Bioengineering Applications. [Doctoral Dissertation]. Vanderbilt University; 2018. Available from: http://hdl.handle.net/1803/12611
Vanderbilt University
16.
Bailey, Danielle Marie.
Illuminating Molecular Mechanisms of Serotonin Transporter Regulation with Quantum Dot Single Particle Tracking.
Degree: PhD, Interdisciplinary Materials Science, 2019, Vanderbilt University
URL: http://hdl.handle.net/1803/10457
► The serotonin transporter protein (SERT) terminates serotonin signaling in the brain by enabling rapid clearance of the neurotransmitter. SERT dysfunction has been associated with a…
(more)
▼ The serotonin transporter protein (SERT) terminates serotonin signaling in the brain by enabling rapid clearance of the neurotransmitter. SERT dysfunction has been associated with a variety of psychiatric disorders, including depression, anxiety, and autism. Visualizing SERT behavior at the single molecule level in endogenous systems remains a challenge. In this dissertation, quantum dot (QD) single particle tracking (SPT) is utilized to capture SERT dynamics in both a hyperphosphorylated disease-associated mutant model, Gly56Ala SERT, and primary rat midbrain neurons. Membrane microenvironment, specifically membrane cholesterol, plays a key role in SERT regulation and has been found to affect SERT conformational state. A key focus was to determine how reduced cholesterol content affects both lateral mobility and phosphorylation of conformationally-sensitive threonine 276 (Thr276) in endogenous SERT using two different methods of cholesterol manipulation, statins and methyl-beta-cyclodextrin. Both chronic and acute cholesterol depletion increased SERT lateral diffusion, radial displacement along the membrane, mobile fraction, and Thr276 phosphorylation levels. The hyperphosphorylated Gly56Ala SERT also displayed increased lateral diffusion and radial displacement compared to the wild type SERT. In addition to the SERT studies, progress towards monovalent aptamer-QD probes is detailed. The aptamer-QDs displayed 1:1 binding with extracellular GFP and were generalizable for a variety of neuronal proteins. Overall, this work has provided new insights about endogenous neuronal SERT mobility and its associations with membrane cholesterol and SERT phosphorylation status, as well as a new method for generating monovalent aptamer-QDs.
Advisors/Committee Members: Yaqiong Xu (committee member), John Wilson (committee member), John McLean (committee member), Qi Zhang (committee member), Sandra Rosenthal (Committee Chair).
Subjects/Keywords: single particle tracking; serotonin transporter; quantum dots
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APA (6th Edition):
Bailey, D. M. (2019). Illuminating Molecular Mechanisms of Serotonin Transporter Regulation with Quantum Dot Single Particle Tracking. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/10457
Chicago Manual of Style (16th Edition):
Bailey, Danielle Marie. “Illuminating Molecular Mechanisms of Serotonin Transporter Regulation with Quantum Dot Single Particle Tracking.” 2019. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/10457.
MLA Handbook (7th Edition):
Bailey, Danielle Marie. “Illuminating Molecular Mechanisms of Serotonin Transporter Regulation with Quantum Dot Single Particle Tracking.” 2019. Web. 27 Jan 2021.
Vancouver:
Bailey DM. Illuminating Molecular Mechanisms of Serotonin Transporter Regulation with Quantum Dot Single Particle Tracking. [Internet] [Doctoral dissertation]. Vanderbilt University; 2019. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/10457.
Council of Science Editors:
Bailey DM. Illuminating Molecular Mechanisms of Serotonin Transporter Regulation with Quantum Dot Single Particle Tracking. [Doctoral Dissertation]. Vanderbilt University; 2019. Available from: http://hdl.handle.net/1803/10457
Vanderbilt University
17.
Rodriguez, Gilberto Antonio.
Advanced Porous Silicon Photonic Devices for Biosensing Applications.
Degree: PhD, Electrical Engineering, 2016, Vanderbilt University
URL: http://hdl.handle.net/1803/11353
► Ring resonator and photonic crystal nanobeam devices are demonstrated in porous silicon waveguide and Bloch surface wave films for on-chip biosensing applications. These advanced photonic…
(more)
▼ Ring resonator and photonic crystal nanobeam devices are demonstrated in porous silicon waveguide and Bloch surface wave films for on-chip biosensing applications. These advanced photonic structures combine the strong light-matter interaction and multilayer versatility intrinsic to porous silicon films with the high quality factor and low modal volume advantages of resonant photonic devices. The porous morphology promotes direct light-matter interaction of confined optical modes with small target molecules that infiltrate the pores. A novel Bloch surface and sub-surface wave porous silicon multilayer film is demonstrated that allows size selective detection of both large and small molecules by supporting both a surface wave mode and one or more guided modes within the multilayer porous silicon film. By facilitating large molecule detection via the Bloch surface wave, this porous silicon structure overcomes major limitations in the size and molecular weight of species that porous silicon sensors are capable of sensitively detecting. In addition, porous silicon ring resonators and nanobeams are demonstrated for the first time and exhibit a 40-fold sensitivity improvement over nonporous silicon-on-insulator ring resonator and nanobeam sensors. Finally, the first experimental realization of a Bloch surface wave ring resonator is reported and is demonstrated in the porous silicon material system. This new structure may open the door to new opportunities in integrated optics; a molecular sensing application is demonstrated as a first example. Overall, the ability to create multilayer porous silicon films and incorporate on-chip photonic devices allows the development of novel photonic resonator families that show particular promise for future lab-on-a-chip and sensor array devices.
Advisors/Committee Members: Yaqiong Xu (committee member), Jason Valentine (committee member), Ronald Schrimpf (committee member), Rizia Bhardan (committee member), Sharon Weiss (Committee Chair).
Subjects/Keywords: Photonic Crystals; Ring Resonator; Porous Silicon; Nanobeam; Bloch surface wave; Biosensing
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APA (6th Edition):
Rodriguez, G. A. (2016). Advanced Porous Silicon Photonic Devices for Biosensing Applications. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/11353
Chicago Manual of Style (16th Edition):
Rodriguez, Gilberto Antonio. “Advanced Porous Silicon Photonic Devices for Biosensing Applications.” 2016. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/11353.
MLA Handbook (7th Edition):
Rodriguez, Gilberto Antonio. “Advanced Porous Silicon Photonic Devices for Biosensing Applications.” 2016. Web. 27 Jan 2021.
Vancouver:
Rodriguez GA. Advanced Porous Silicon Photonic Devices for Biosensing Applications. [Internet] [Doctoral dissertation]. Vanderbilt University; 2016. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/11353.
Council of Science Editors:
Rodriguez GA. Advanced Porous Silicon Photonic Devices for Biosensing Applications. [Doctoral Dissertation]. Vanderbilt University; 2016. Available from: http://hdl.handle.net/1803/11353
Vanderbilt University
18.
Hong, Tu.
Low-dimensional materials for optoelectronic and bioelectronic applications.
Degree: PhD, Electrical Engineering, 2017, Vanderbilt University
URL: http://hdl.handle.net/1803/13783
► The field of nanotechnology has witnessed amazing development in the past decade. In particular, studies of low-dimensional materials, including carbon nanotubes (CNTs), graphene, and other…
(more)
▼ The field of nanotechnology has witnessed amazing development in the past decade. In particular, studies of low-dimensional materials, including carbon nanotubes (CNTs), graphene, and other two-dimensional (2D) materials, have evolved into a fast-growing area. From insulating hexagonal boron nitride, semiconducting transition metal dichalcogenides, to semimetallic graphene and CNTs in either semiconducting or metallic forms, these materials exhibit unique electronic and optoelectronic properties that are especially fascinating. With the advances in their synthesis and device fabrication techniques, low-dimensional materials have been demonstrated as promising candidates for a variety of applications, such as battery anode materials, light emitting diodes, electric circuits, solar cells, etc.
This dissertation focuses on the optoelectronic and bioelectronic applications of low-dimensional materials. We start by investigating the optical and thermal properties of CNTs and curled graphene ribbons, followed by the photocurrent generation mechanisms in 2D materials and their heterostructure. Finally, we bring the low-dimensional materials into a biological environment by studying single-molecule interaction between CNT and DNA. These novel low-dimensional materials provide new opportunities for future optoelectronic and bioelectronic devices.
Advisors/Committee Members: Daniel M. Fleetwood (committee member), Deyu Li (committee member), Ronald D. Schrimpf (committee member), Sharon M. Weiss (committee member), Yaqiong Xu (Committee Chair).
Subjects/Keywords: photodetector; bioelectronic; optoelectronic; carbon nanotube; graphene; 2D material; biosensor
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APA (6th Edition):
Hong, T. (2017). Low-dimensional materials for optoelectronic and bioelectronic applications. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/13783
Chicago Manual of Style (16th Edition):
Hong, Tu. “Low-dimensional materials for optoelectronic and bioelectronic applications.” 2017. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/13783.
MLA Handbook (7th Edition):
Hong, Tu. “Low-dimensional materials for optoelectronic and bioelectronic applications.” 2017. Web. 27 Jan 2021.
Vancouver:
Hong T. Low-dimensional materials for optoelectronic and bioelectronic applications. [Internet] [Doctoral dissertation]. Vanderbilt University; 2017. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/13783.
Council of Science Editors:
Hong T. Low-dimensional materials for optoelectronic and bioelectronic applications. [Doctoral Dissertation]. Vanderbilt University; 2017. Available from: http://hdl.handle.net/1803/13783
Vanderbilt University
19.
Yang, Yang.
Thermal transport through individual nanostructures and their contacts.
Degree: PhD, Mechanical Engineering, 2013, Vanderbilt University
URL: http://hdl.handle.net/1803/12948
► Thermal conductivities of individual nanostructures have been measured recently with several newly-developed experimental schemes. However, quantifying contact thermal resistance between a nanostructure and related heat…
(more)
▼ Thermal conductivities of individual nanostructures have been measured recently with several newly-developed experimental schemes. However, quantifying contact thermal resistance between a nanostructure and related heat source/sink and extracting the intrinsic thermal conductivity of the nanostructure remain a significant challenge. In this dissertation, we develop a measurement method based on a suspended microdevice to derive intrinsic thermal conductivities of individual nanostructures such as multi-walled carbon nanotubes (MWCNTs) and silicon nanoribbons. Through multiple measurements of the same sample with different suspended lengths between the heat source and heat sink, the intrinsic thermal conductivity can be extracted. For MWCNTs, the intrinsic thermal conductivity is significantly higher than the effective ones without eliminating the contact thermal resistance between the CNT and the heat source/sink. For silicon nanoribbons, however, due to the flat contact configuration with relatively large contact area between silicon nanoribbons and suspended membranes, the contact thermal resistance is negligible. Results indicate that for nanoribbons with rectangular cross-sections, one single parameter (e.g. the Casimir length) is not enough to characterize the phonon-boundary scattering effects.
This dissertation also studies the thermal conductivity of boron carbide nanowires, a promising high temperature thermoelectric nanomaterial. One-on-one thermal property-structure characterization results suggest that the thermal conductivity of individual boron carbide nanowires can be affected by several different factors such as crystalline structure, carbon content, fault orientation and density, as well as wire diameter.
To address the less than expected thermal conductivity enhancement for CNT-based nanocomposites, this dissertation presents an innovative approach to measure the contact thermal conductance between individual MWCNTs. For bare MWCNTs, contrary to the common expectation, the normalized contact thermal conductance per unit area still depends linearly on the tube diameter. The intriguing observation is explained by showing that the phonon mean free path in the c-axis direction of graphite is two orders of magnitude higher than the commonly believed value of just a few nanometers. For MWCNTs with humic acid coating, no diameter dependence was observed even for the total contact thermal conductance, likely due to the variation in the coated humic acid layer, which can significantly affect thermal transport at the contact.
Advisors/Committee Members: Robert W. Pitz (committee member), Greg Walker (committee member), Yaqiong Xu (committee member), Deyu Li (Committee Chair).
Subjects/Keywords: nanostructure; thermal conductivity; thermal transport; contact; carbon nanotube
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APA (6th Edition):
Yang, Y. (2013). Thermal transport through individual nanostructures and their contacts. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/12948
Chicago Manual of Style (16th Edition):
Yang, Yang. “Thermal transport through individual nanostructures and their contacts.” 2013. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/12948.
MLA Handbook (7th Edition):
Yang, Yang. “Thermal transport through individual nanostructures and their contacts.” 2013. Web. 27 Jan 2021.
Vancouver:
Yang Y. Thermal transport through individual nanostructures and their contacts. [Internet] [Doctoral dissertation]. Vanderbilt University; 2013. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/12948.
Council of Science Editors:
Yang Y. Thermal transport through individual nanostructures and their contacts. [Doctoral Dissertation]. Vanderbilt University; 2013. Available from: http://hdl.handle.net/1803/12948
Vanderbilt University
20.
Dodson, Kirsten Heikkinen.
Microfluidic Platforms for Chemical and Electrical Signaling in Whole Retina Tissue.
Degree: PhD, Mechanical Engineering, 2016, Vanderbilt University
URL: http://hdl.handle.net/1803/13337
► Microfluidic platforms are extremely promising for cell and tissue culture by greatly reducing costs while opening doors of opportunity for biological assays that were not…
(more)
▼ Microfluidic platforms are extremely promising for cell and tissue culture by greatly reducing costs while opening doors of opportunity for biological assays that were not feasible previously. The capability of precise spatiotemporal control of microenvironments enables new assays to probe the physiological and pathological behaviors of cells and tissues. Integration of advanced sensing technologies with microfluidics allows for probing phenomena within cells and tissue. This dissertation presents microfluidic platforms for localized probing of whole retina tissue, which has the advantages of easy accessibility, highly organized structure, and unique light sensitivity. These platforms allow for spatially isolated chemical and electrical stimulation and detection of cell signaling events in whole retina tissue. The Retina-on-a-Chip platform has achieved localized point application of reagents to the surface of the retina while maintaining tissue health over a long-term culture. When integrated with graphene transistors, this platform provides the opportunity to also probe electrical signaling events. As a key component in the Retina-on-a-Chip platform, the thin-film PDMS layer was found challenging to fabricate, thus current fabrication techniques were analyzed and new approaches were examined.
Advisors/Committee Members: Haoxiang Luo (committee member), Yaqiong Xu (committee member), Leon Bellan (committee member), Deyu Li (Committee Chair), Rebecca M. Sappington (Committee Chair).
Subjects/Keywords: tissue culture; lab chip; controlled delivery; retina; scanning photocurrent; laser cutting PDMS; thin-film PDMS layers
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APA (6th Edition):
Dodson, K. H. (2016). Microfluidic Platforms for Chemical and Electrical Signaling in Whole Retina Tissue. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/13337
Chicago Manual of Style (16th Edition):
Dodson, Kirsten Heikkinen. “Microfluidic Platforms for Chemical and Electrical Signaling in Whole Retina Tissue.” 2016. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/13337.
MLA Handbook (7th Edition):
Dodson, Kirsten Heikkinen. “Microfluidic Platforms for Chemical and Electrical Signaling in Whole Retina Tissue.” 2016. Web. 27 Jan 2021.
Vancouver:
Dodson KH. Microfluidic Platforms for Chemical and Electrical Signaling in Whole Retina Tissue. [Internet] [Doctoral dissertation]. Vanderbilt University; 2016. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/13337.
Council of Science Editors:
Dodson KH. Microfluidic Platforms for Chemical and Electrical Signaling in Whole Retina Tissue. [Doctoral Dissertation]. Vanderbilt University; 2016. Available from: http://hdl.handle.net/1803/13337
Vanderbilt University
21.
Yang, Lijie.
Probing Cell Mechanotransduction and Electric Activity with Microfluidic Platforms.
Degree: PhD, Mechanical Engineering, 2017, Vanderbilt University
URL: http://hdl.handle.net/1803/12596
► How cells detect and respond to mechanical, chemical, and electrical stimuli and make vital cellular decisions accordingly has been extremely puzzling and intriguing. Despite unremitting…
(more)
▼ How cells detect and respond to mechanical, chemical, and electrical stimuli and make vital cellular decisions accordingly has been extremely puzzling and intriguing. Despite unremitting efforts of generations of researchers, there are still many mysteries remaining to be addressed, partly due to the limitations of available technologies. In this work, a series of novel microfluidic platforms were developed and applied to the studies of cell mechanotransduction and electrical activities as well as organism behaviors. First, experiments based on a microfluidic stretcher device demonstrates a key role of mechanical stretching and relaxation in normal fibroblasts (NAFs) activation and cancer-associated fibroblasts (CAFs) deactivation, indicating a new potential cancer therapeutic strategy targeting tumor stroma. In addition, a three-dimensional (3D) compression assay illustrates significantly different orientation behavior of NAFs and CAFs in response to 3D compression. Such distinction was understood based on the significant difference of the inherent stress generated by stress fibers, a major intercellular machinery, between NAFs and CAFs. For electrical activity studies, a novel graphene-based microfluidic platform was constructed to probe the electrical signals of individual dendritic spines and synaptic contacts in the central nervous systems. Ultrahigh spatiotemporal resolution of the graphene-transistor based scanning photocurrent microscopy has been demonstrated. Finally, new microfluidic platforms have also been developed to study organism behaviors. A microfluidic diode structure was created for facilitating C. elegans translocation, based on which a collection of devices was designed for simultaneous worm sorting at a high throughput as well as collection or immobilization for further investigation. In summary, this dissertation showcased a class of novel microfluidic platforms and demonstrated important biological applications spanning subcellular, cellular, and organismal levels.
Advisors/Committee Members: Donna J. Webb (committee member), Yaqiong Xu (committee member), Leon M. Bellan (committee member), Haoxiang Luo (committee member), Deyu Li (Committee Chair).
Subjects/Keywords: Normal Fibroblasts; Electrophysiology; Cell Mechanotransduction; Microfluidics; Graphene; Cancer-associated Fibroblasts
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APA ·
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APA (6th Edition):
Yang, L. (2017). Probing Cell Mechanotransduction and Electric Activity with Microfluidic Platforms. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/12596
Chicago Manual of Style (16th Edition):
Yang, Lijie. “Probing Cell Mechanotransduction and Electric Activity with Microfluidic Platforms.” 2017. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/12596.
MLA Handbook (7th Edition):
Yang, Lijie. “Probing Cell Mechanotransduction and Electric Activity with Microfluidic Platforms.” 2017. Web. 27 Jan 2021.
Vancouver:
Yang L. Probing Cell Mechanotransduction and Electric Activity with Microfluidic Platforms. [Internet] [Doctoral dissertation]. Vanderbilt University; 2017. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/12596.
Council of Science Editors:
Yang L. Probing Cell Mechanotransduction and Electric Activity with Microfluidic Platforms. [Doctoral Dissertation]. Vanderbilt University; 2017. Available from: http://hdl.handle.net/1803/12596
Vanderbilt University
22.
Miller, Kevin Joseph.
Hybrid Silicon-Vanadium Dioxide Photonic Devices for Optical Modulation.
Degree: PhD, Interdisciplinary Materials Science, 2018, Vanderbilt University
URL: http://hdl.handle.net/1803/11470
► The integration of optical components with silicon complementary metal–oxide–semiconductor (CMOS) technology may lead to the increase in information carrying capacity and reduction in power consumption…
(more)
▼ The integration of optical components with silicon complementary metal–oxide–semiconductor (CMOS) technology may lead to the increase in information carrying capacity and reduction in power consumption necessary to continue the scaling the performance of microelectronic devices historically predicted by Moore’s law. Silicon photonic structures that can guide light are well suited for such integration. However, the indirect band gap and relatively weak electro-optic responses of silicon provide challenges for chip-based lasing and modulation, two key functions necessary for an integrated photonic platform. For this reason, incorporation of materials possessing superior optical properties to silicon is actively being explored on silicon photonic platforms.
The focus of this dissertation is to advance the scientific understanding and performance metrics of silicon-based optical modulators through hybridization with the actively tunable optical phase change material, vanadium dioxide (VO2). First, integration of VO2 onto a silicon ring resonator photonic platform and the subsequent electro-optic modulation of this hybrid structure are demonstrated. A tradeoff between extinction ratio and device response times is found when different VO2 patch lengths are utilized. Second, a platform in which VO2 is embedded within a silicon waveguide is realized. This embedded geometry increases interaction between the guided mode and VO2 in comparison to a geometry in which VO2 is placed on top of the silicon waveguide. Theoretical and experimental characterization through finite-difference time-domain analysis and temperature-dependent transmission measurements, respectively, demonstrates the tradeoff between extinction ratio and insertion loss as a function of VO2 patch length. Finally, the potential implementation of the hybrid silicon/VO2 embedded waveguide as an all-optical modulator with in-plane excitation is considered and its expected performance is compared to state-of-the-art all-optical modulators.
Advisors/Committee Members: Yaqiong Xu (committee member), Jason Valentine (committee member), Daniel M. Fleetwood (committee member), Richard F. Haglund (committee member), Sharon M. Weiss (Committee Chair).
Subjects/Keywords: vanadium dioxide; optical modulation; silicon photonics
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APA (6th Edition):
Miller, K. J. (2018). Hybrid Silicon-Vanadium Dioxide Photonic Devices for Optical Modulation. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/11470
Chicago Manual of Style (16th Edition):
Miller, Kevin Joseph. “Hybrid Silicon-Vanadium Dioxide Photonic Devices for Optical Modulation.” 2018. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/11470.
MLA Handbook (7th Edition):
Miller, Kevin Joseph. “Hybrid Silicon-Vanadium Dioxide Photonic Devices for Optical Modulation.” 2018. Web. 27 Jan 2021.
Vancouver:
Miller KJ. Hybrid Silicon-Vanadium Dioxide Photonic Devices for Optical Modulation. [Internet] [Doctoral dissertation]. Vanderbilt University; 2018. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/11470.
Council of Science Editors:
Miller KJ. Hybrid Silicon-Vanadium Dioxide Photonic Devices for Optical Modulation. [Doctoral Dissertation]. Vanderbilt University; 2018. Available from: http://hdl.handle.net/1803/11470
Vanderbilt University
23.
Yang, Lin.
Phonon Transport in Nanowires – Beyond Classical Size Effects.
Degree: PhD, Mechanical Engineering, 2019, Vanderbilt University
URL: http://hdl.handle.net/1803/11017
► Understanding and controlling thermal transport in one dimensional nanostructures as well as at their interfaces are emerging as an essential necessity for the development of…
(more)
▼ Understanding and controlling thermal transport in one dimensional nanostructures as well as at their interfaces are emerging as an essential necessity for the development of a broad variety of technologies in nanoelectronics and energy conversion. In the past two decades, the thermal conductivities of many different kinds of nanostructures have been explored and the underlying mechanisms governing the transport process have been dissected. For nanowires, beyond the well-recognized classical size effects due to phonon-boundary scattering, several new factors, such as acoustic softening, surface roughness, and complex morphology, have also been shown to be able to significantly alter the thermal conductivity of nanowires.
This dissertation seeks to further the understanding of the complicated transport dynamics in thin nanostructures and at their interfaces, and to answer some of the fundamental questions on interactions between energy and charge carriers in quasi-one-dimensional systems. These questions are addressed through a number of combined experimental approaches, such as the thermal conductance and thermoelectric property measurements of suspended nanostructures, elastic property test with atomic force microscopy, and high-resolution transmission electron microscopy examination.
By coupling the measured thermal conductivity and Young’s modulus of two groups Si nanoribbons with thickness of either ~30 or 20 nm, acoustic softening effect is shown to significantly suppress thermal transport in the thinner ribbons in addition to the classical size effects. Furthermore, it is demonstrated that phonons can ballistically penetrate through the van der Waals interface between two silicon nanoribbons with amorphous SiO2 layers of up to a total of 5 nm thick at the interface. This observation indicates an unexpected phonon mean free path that is one order of magnitude longer than that predicted based on Einstein random walk model. Lastly, taking advantage of the unique features of charge density waves occurring in quasi-one-dimensional NbSe3 nanowires, we demonstrate distinct signatures of electron-phonon scatterings that can only be recaptured through considering electron-phonon scattering, which provides data to distinguish the contribution of electron-phonon scattering to phonon transport from other scattering mechanisms.
Advisors/Committee Members: D. Greg Walker (committee member), Joshua Caldwell (committee member), Leon Bellan (committee member), Yaqiong Xu (committee member), Deyu Li (Committee Chair).
Subjects/Keywords: nanoscale thermal transport; nanowires; electron-phonon coupling; elastic softening/stiffening; ballistic phonon transport; charge density waves
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APA ·
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APA (6th Edition):
Yang, L. (2019). Phonon Transport in Nanowires – Beyond Classical Size Effects. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/11017
Chicago Manual of Style (16th Edition):
Yang, Lin. “Phonon Transport in Nanowires – Beyond Classical Size Effects.” 2019. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/11017.
MLA Handbook (7th Edition):
Yang, Lin. “Phonon Transport in Nanowires – Beyond Classical Size Effects.” 2019. Web. 27 Jan 2021.
Vancouver:
Yang L. Phonon Transport in Nanowires – Beyond Classical Size Effects. [Internet] [Doctoral dissertation]. Vanderbilt University; 2019. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/11017.
Council of Science Editors:
Yang L. Phonon Transport in Nanowires – Beyond Classical Size Effects. [Doctoral Dissertation]. Vanderbilt University; 2019. Available from: http://hdl.handle.net/1803/11017
Vanderbilt University
24.
Wires, Alexander Duane.
Some Results in Universal Algebra.
Degree: PhD, Mathematics, 2013, Vanderbilt University
URL: http://hdl.handle.net/1803/12260
► In the first part, we explore definability in the substructure relation. Let U denote either the universal class of irreflexive symmetric digraphs or equivalence relations.…
(more)
▼ In the first part, we explore definability in the substructure relation. Let U denote either the universal
class of irreflexive symmetric digraphs or equivalence relations. We analyze first-order definability in the
ordered set of finite isomorphism types of structures in U ordered by embeddability.
We prove the this ordered set has only one non-identity automorphism and each finite isomorphism
type is definable up to to this automorphism. These results can be utilized to explore first-order
definability in the closely associated lattice of universal subclasses of U . We show the lattice of universal
subclasses has only one non-identity automorphism, the set of finitely generated and finitely axiomatizable
universal subclasses are separately definable, and each such universal subclass is definable up to the unique
non-identity automorphism; furthermore, we show that after adding a single constant type c, first-order definability
in the substructure relation captures, up to isomorphism, second-order satisfiability among the finite structures
in U .
In the second part, we provide an alternate characterization for quasivarieties which extends the malcev
condition for varieties with a weak difference term. As an application, we derive elementary proofs of two
well-known results in the theory of digraph polymorphisms.
Advisors/Committee Members: Steven Tschantz (committee member), Constantine Tsinakis (committee member), Mark Ellingham (committee member), Yaqiong Xu (committee member), Ralph McKenzie (Committee Chair).
Subjects/Keywords: Definability; substructure ordering; simple graphs; weak difference term; equivalence relations
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APA (6th Edition):
Wires, A. D. (2013). Some Results in Universal Algebra. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/12260
Chicago Manual of Style (16th Edition):
Wires, Alexander Duane. “Some Results in Universal Algebra.” 2013. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/12260.
MLA Handbook (7th Edition):
Wires, Alexander Duane. “Some Results in Universal Algebra.” 2013. Web. 27 Jan 2021.
Vancouver:
Wires AD. Some Results in Universal Algebra. [Internet] [Doctoral dissertation]. Vanderbilt University; 2013. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/12260.
Council of Science Editors:
Wires AD. Some Results in Universal Algebra. [Doctoral Dissertation]. Vanderbilt University; 2013. Available from: http://hdl.handle.net/1803/12260
Vanderbilt University
25.
Zhao, Yiliang.
Engineering Porous Silicon Photonic Structures towards Fast and Reliable Optical Biosensing.
Degree: PhD, Interdisciplinary Materials Science, 2017, Vanderbilt University
URL: http://hdl.handle.net/1803/11255
► Porous silicon, a nanostructured material formed by electrochemical etching of a silicon substrate, is an ideal candidate for constructing optical biosensors due to its large…
(more)
▼ Porous silicon, a nanostructured material formed by electrochemical etching of a silicon substrate, is an ideal candidate for constructing optical biosensors due to its large internal surface area, straightforward fabrication, and tunable optical properties that can be exploited to form numerous photonic structures. A major challenge for porous silicon biosensors is its reactive surface that is highly susceptible to oxidation and corrosion in an aqueous environment. In DNA sensing applications, porous silicon corrosion can mask the DNA binding signal as the dissolution of porous silicon is accelerated by the negative charges on the phosphate backbone of the DNA molecules. This corrosion process can be mitigated through surface passivation of porous silicon and the use of charge neutral peptide nucleic acid molecules as capturing probes for DNA targets. Complete mitigation can be achieved by additionally introducing Mg2+ ions to shield the negative charges on the DNA targets. Another key challenge facing porous silicon biosensors is the inefficient analyte transport through nanopores, which can be as slow as a few molecules per pore per second for molecules whose size approaches that of the pore opening. An open-ended porous silicon membrane is demonstrated to overcome the mass transport challenge by allowing analytes to flow through the pores in microfluidic-based assays. The flow-through approach for biosensing using porous silicon membranes enables a 6-fold improvement in sensor response time compared to closed-ended, flow-over porous silicon sensors when detecting high molecular weight analytes (e.g., streptavidin). For small analytes, little to no sensor performance improvement is observed as the closed-ended porous silicon films do not suffer significant mass transport challenges with these molecules. Experimental results and finite element method simulations also indicate that the flow-through scheme enables more reasonable response times for the detection of dilute analytes and reduces the volume of solution required for analysis. Overall, the improvement of surface stabilization and analyte transport efficiency in porous silicon photonic structures opens the door to a fast and reliable optical biosensing platform.
Advisors/Committee Members: Dmitry Koktysh (committee member), Deyu Li (committee member), Yaqiong Xu (committee member), Paul E. Laibinis (Committee Chair), Sharon M. Weiss (Committee Chair).
Subjects/Keywords: dna sensor; membrane; optical biosensor; porous silicon; flow-through; kinetics
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APA ·
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APA (6th Edition):
Zhao, Y. (2017). Engineering Porous Silicon Photonic Structures towards Fast and Reliable Optical Biosensing. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/11255
Chicago Manual of Style (16th Edition):
Zhao, Yiliang. “Engineering Porous Silicon Photonic Structures towards Fast and Reliable Optical Biosensing.” 2017. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/11255.
MLA Handbook (7th Edition):
Zhao, Yiliang. “Engineering Porous Silicon Photonic Structures towards Fast and Reliable Optical Biosensing.” 2017. Web. 27 Jan 2021.
Vancouver:
Zhao Y. Engineering Porous Silicon Photonic Structures towards Fast and Reliable Optical Biosensing. [Internet] [Doctoral dissertation]. Vanderbilt University; 2017. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/11255.
Council of Science Editors:
Zhao Y. Engineering Porous Silicon Photonic Structures towards Fast and Reliable Optical Biosensing. [Doctoral Dissertation]. Vanderbilt University; 2017. Available from: http://hdl.handle.net/1803/11255
Vanderbilt University
26.
Markov, Petr.
Hybrid Silicon-Vanadium Dioxide Modulators and Transformation Optics Couplers for Optical Interconnects.
Degree: PhD, Electrical Engineering, 2015, Vanderbilt University
URL: http://hdl.handle.net/1803/11145
► The ever-growing demand for more powerful computers has led to the emergence of multicore processors. Due to the nature of parallel processing, additional cores significantly…
(more)
▼ The ever-growing demand for more powerful computers has led to the emergence of multicore processors. Due to the nature of parallel processing, additional cores significantly improve performance. However, a major roadblock preventing the number of cores from growing without bounds is the rate at which they can share information. Current state-of-the-art technology uses copper electrical interconnects to carry information between cores. Copper interconnects suffer performance deterioration with increased data rates due to cross talk and increased power requirements. Using light to transfer information can help solve these problems leading to more compact and faster interconnects that consume less power.
In this dissertation work, two components of optical interconnects based on silicon photonics were investigated: fiber-to-chip couplers and electro-optic modulators. A transformation optics approach was utilized to design a compact and efficient fiber-to-chip coupler. The coupler was experimentally realized on a silicon-on-insulator platform and demonstrated a fivefold improvement in efficiency over a conventional design while occupying very little chip estate. A hybrid VO2-Si material system was used to improve the performance of on-chip silicon electro-optic modulators. The semiconductor-to-metal phase transition of VO2 gives rise to a large change in its dielectric function at ultrashort time scales, which can be harnessed to change the effective index of a propagating mode in hybrid VO2-Si waveguides. Electro-optic switching of hybrid VO2-Si waveguides at ultrafast time scales was demonstrated for the first time along with record values for the electrically triggered VO2 semiconductor-metal and metal-semiconductor phase transition times. A plasmonic electro-optic modulator based on the VO2-Si hybrid material system was also designed and simulated, showing a record high extinction ratio per unit length, ultra-compact footprint, and low threshold power.
Advisors/Committee Members: Richard Haglund (committee member), Jason Valentine (committee member), Kirill Bolotin (committee member), Yaqiong Xu (committee member), Sharon Weiss (Committee Chair).
Subjects/Keywords: Vanadium dioxide; optical interconnect; electro-optic modulator; transformation optics; fiber-to-chip coupler
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APA (6th Edition):
Markov, P. (2015). Hybrid Silicon-Vanadium Dioxide Modulators and Transformation Optics Couplers for Optical Interconnects. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/11145
Chicago Manual of Style (16th Edition):
Markov, Petr. “Hybrid Silicon-Vanadium Dioxide Modulators and Transformation Optics Couplers for Optical Interconnects.” 2015. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/11145.
MLA Handbook (7th Edition):
Markov, Petr. “Hybrid Silicon-Vanadium Dioxide Modulators and Transformation Optics Couplers for Optical Interconnects.” 2015. Web. 27 Jan 2021.
Vancouver:
Markov P. Hybrid Silicon-Vanadium Dioxide Modulators and Transformation Optics Couplers for Optical Interconnects. [Internet] [Doctoral dissertation]. Vanderbilt University; 2015. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/11145.
Council of Science Editors:
Markov P. Hybrid Silicon-Vanadium Dioxide Modulators and Transformation Optics Couplers for Optical Interconnects. [Doctoral Dissertation]. Vanderbilt University; 2015. Available from: http://hdl.handle.net/1803/11145
Vanderbilt University
27.
Cao, Yunhao.
A study of optoelectronic properties of carbon nanomaterials: transistors, sensors, and beyond.
Degree: PhD, Electrical Engineering, 2013, Vanderbilt University
URL: http://hdl.handle.net/1803/13858
► The aims of this dissertation are to develop synthesis techniques for carbon nanomaterials, to investigate their electrical and optical properties, and to explore their applications…
(more)
▼ The aims of this dissertation are to develop synthesis techniques for carbon nanomaterials, to investigate their electrical and optical properties, and to explore their applications in energy conversion and biological systems.By combining the techniques of material synthesis and device fabrication and characterization, two primary carbon nanomaterials, carbon nanotubes (CNTs) and graphene, have been systematically studied. Two different strategies have been developed to control the growth morphology and density of CNTs by chemical vapor deposition. Suspended CNT transistors have also been fabricated to explore the local electrostatic changes in a liquid environment through scanning photocurrent measurements. Moreover, we have employed a facile method to enhance the photocurrent response of graphene, another important carbon nanomaterial, by altering the graphene morphology. Gate-dependent scanning photocurrent measurements indicate that the photothermoelectric effect plays a key role in the photocurrent enhancement of graphene.
Advisors/Committee Members: Prof. Weng Poo Kang (committee member), Prof. Daniel M. Fleetwood (committee member), Prof. Bharat Bhuva (committee member), Prof. Deyu Li (committee member), Prof. Yaqiong Xu (Committee Chair).
Subjects/Keywords: photocurrent; optoelectronics; growth; carbon nanotubes; graphene
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APA (6th Edition):
Cao, Y. (2013). A study of optoelectronic properties of carbon nanomaterials: transistors, sensors, and beyond. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/13858
Chicago Manual of Style (16th Edition):
Cao, Yunhao. “A study of optoelectronic properties of carbon nanomaterials: transistors, sensors, and beyond.” 2013. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/13858.
MLA Handbook (7th Edition):
Cao, Yunhao. “A study of optoelectronic properties of carbon nanomaterials: transistors, sensors, and beyond.” 2013. Web. 27 Jan 2021.
Vancouver:
Cao Y. A study of optoelectronic properties of carbon nanomaterials: transistors, sensors, and beyond. [Internet] [Doctoral dissertation]. Vanderbilt University; 2013. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/13858.
Council of Science Editors:
Cao Y. A study of optoelectronic properties of carbon nanomaterials: transistors, sensors, and beyond. [Doctoral Dissertation]. Vanderbilt University; 2013. Available from: http://hdl.handle.net/1803/13858
Vanderbilt University
28.
Hsu, Shao-Hua.
Development of Vertical Nanodiamond Vacuum Field Emission Microelectronic Integrated Devices.
Degree: PhD, Electrical Engineering, 2014, Vanderbilt University
URL: http://hdl.handle.net/1803/10632
► Recent development of nanocrystalline diamonds has demonstrated the potential use of diamond material for vacuum microelectronics. Apart from the advantages of conventional microcrystalline diamond, nanodiamond…
(more)
▼ Recent development of nanocrystalline diamonds has demonstrated the potential use of diamond material for vacuum microelectronics. Apart from the advantages of conventional microcrystalline diamond, nanodiamond with smaller grain size and smoother surface morphology possesses unique properties including the insertion of deliberate amounts of sp2-carbon into the sp3-diamond matrix and controlled electrical conductivity, expanding its utility for practical applications. This research is focused on the design, fabrication, and characterization of nitrogen-incorporated nanodiamond vacuum field emission (VFE) functional devices and integrated circuits, specifically on vertically configured VFE transistors, triodes, and differential amplifiers (diff-amps).
A well-controlled and IC-compatible fabrication process has been developed to achieve three-terminal nanodiamond VFE integrated devices for vacuum micro/nanoelectronics. The nanodiamond pyramidal sharpened nanotips built with self-aligned silicon gate and anode electrodes were fabricated by employing a dual-mask microfabrication process which involved a silicon-on-insulator (SOI) mold transfer technique in collaboration with chemical vapor deposition (CVD) of nanodiamond and silicon gate partitioning. With proper design of the electrodes placement, the fabricated VFE functional devices have achieved transistor and triode characteristics, and they have been further implemented into vacuum integrated circuit building block – differential amplifiers.
The nanodiamond VFE transistors and triodes demonstrate efficient gate-modulated electron field emission behavior with low operating voltages, high emission current, and negligible gate intercepted current. The dc characteristics of the transistor demonstrate distinct linear, saturation and cutoff regions with low turn-on gate voltage and high amplification factor. The triode demonstrates high emission current with efficient current modulation by low gate voltages. The ac signal amplification performance has been evaluated, indicating the applicability of nanodiamond VFE transistors and triodes as signal amplifiers and buffer amplifiers, respectively. An identical pair of nanodiamond VFE transistors with well-matched field emission characteristics was constructed and employed to accomplish a nanodiamond VFE diff-amp for the first time. A large common-mode-rejection ratio (~ 60 dB) was realized, demonstrating a viable approach to vacuum-based IC technology. These achievements signify the fundamental step for further development of vacuum integrated micro/nanoelectronics for practical applications, including high-speed, high-power and extreme-environment electronics.
Advisors/Committee Members: Prof. Ralph W. Bruce (committee member), Prof. Bharat L. Bhuva (committee member), Prof. Yaqiong Xu (committee member), Prof. Deyu Li (committee member), Prof. Weng P. Kang (Committee Chair).
Subjects/Keywords: Microelectronic Devices; Nanodiamond; Vacuum Field Emission; Integrated Circuits; Signal Amplifiers
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APA (6th Edition):
Hsu, S. (2014). Development of Vertical Nanodiamond Vacuum Field Emission Microelectronic Integrated Devices. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/10632
Chicago Manual of Style (16th Edition):
Hsu, Shao-Hua. “Development of Vertical Nanodiamond Vacuum Field Emission Microelectronic Integrated Devices.” 2014. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/10632.
MLA Handbook (7th Edition):
Hsu, Shao-Hua. “Development of Vertical Nanodiamond Vacuum Field Emission Microelectronic Integrated Devices.” 2014. Web. 27 Jan 2021.
Vancouver:
Hsu S. Development of Vertical Nanodiamond Vacuum Field Emission Microelectronic Integrated Devices. [Internet] [Doctoral dissertation]. Vanderbilt University; 2014. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/10632.
Council of Science Editors:
Hsu S. Development of Vertical Nanodiamond Vacuum Field Emission Microelectronic Integrated Devices. [Doctoral Dissertation]. Vanderbilt University; 2014. Available from: http://hdl.handle.net/1803/10632
Vanderbilt University
29.
Davidson, Roderick Belden II.
Nonlinear Near-Field Dynamics of Plasmonic Nanostructures.
Degree: PhD, Physics, 2016, Vanderbilt University
URL: http://hdl.handle.net/1803/14988
► We present three experiments designed to explore the physics of nanostructured materials in nonlinear optics. We utilize both photon and electron-beam excitations on systems with…
(more)
▼ We present three experiments designed to explore the physics of nanostructured materials in nonlinear optics. We utilize both photon and electron-beam excitations on systems with local densities of states specifically designed to generate small mode volumes. The first experiment uses planar arrays of gold Archimedean nanospirals to create asymmetric electric-field profiles for efficient second-harmonic generation (SHG). This nanostructure exhibits two-dimensional chirality and record SHG efficiency per unit volume. In the optical-field-induced second harmonic experiment, we employ an array of serrated gold nanogaps coupled to a polymer film to temporally resolve the change in the second-order nonlinear susceptibility of the polymer with 100 attosecond time resolution while separaing the nonlinear signals from the polymer and plasmonic emission using a spatial light modulator. Finally, we report the first demonstration of a quantum emitter in a dressed state using an electron beam to excite neutral nitrogen-vacancy (NV0) centers in a diamond nanocrystal. We deduce the presence of Rabi oscillations from the ensemble of NV0 centers at room temperature by measuring the second-order autocorrelation function of the cathodoluminescence signal that arises from the beam-induced plasmon interaction with the NV0 centers. The effects of phonon scattering on the autocorrelation amplitudes are revealed by subtracting the zero-phonon contribution to the cathodoluminescence spectrum. In summary, we have demonstrated three unique approaches for generating strong nonlinearities in nanoscale systems by manipulating the local density of states and following the dynamical evolution of these states in the time domain.
Advisors/Committee Members: Sandra J. Rosenthal (committee member), Kalman Varga (committee member), Yaqiong Xu (committee member), Jason G. Valentine (committee member), Benjamin J. Lawrie (committee member), Richard F. Haglund Jr. (Committee Chair).
Subjects/Keywords: nonlinear plasmonics; dressed states; harmonic generation
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APA (6th Edition):
Davidson, R. B. I. (2016). Nonlinear Near-Field Dynamics of Plasmonic Nanostructures. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/14988
Chicago Manual of Style (16th Edition):
Davidson, Roderick Belden II. “Nonlinear Near-Field Dynamics of Plasmonic Nanostructures.” 2016. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/14988.
MLA Handbook (7th Edition):
Davidson, Roderick Belden II. “Nonlinear Near-Field Dynamics of Plasmonic Nanostructures.” 2016. Web. 27 Jan 2021.
Vancouver:
Davidson RBI. Nonlinear Near-Field Dynamics of Plasmonic Nanostructures. [Internet] [Doctoral dissertation]. Vanderbilt University; 2016. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/14988.
Council of Science Editors:
Davidson RBI. Nonlinear Near-Field Dynamics of Plasmonic Nanostructures. [Doctoral Dissertation]. Vanderbilt University; 2016. Available from: http://hdl.handle.net/1803/14988
Vanderbilt University
30.
Akbulut, Serkan.
Carbon Nanotubes/Manganese Dioxide Nano-Structured Planar Macro, 3D Micro, and Solid-State Supercapacitors.
Degree: PhD, Electrical Engineering, 2017, Vanderbilt University
URL: http://hdl.handle.net/1803/12637
► Global warming, fuel crisis and massive energy consumption of modern industrial societies have resulted in a greater focus on research and development of advanced energy…
(more)
▼ Global warming, fuel crisis and massive energy consumption of modern industrial societies have resulted in a greater focus on research and development of advanced energy storage devices. However, it is not possible to meet the rising global demands of energy, merely by using green energy sources without supplementing them with advanced energy storage systems. Batteries and supercapacitors (ECs) (also known as electrochemical capacitors or ultracapacitors) are the important electrical energy storage devices that have growing impact in our lives by storing energy in applications ranging from portable electronics, hybrid vehicles, military devices, power tools, bio-medical devices, and large industrial equipment. Supercapacitors are superior to batteries in power density, have excellent reversibility, long cycle life, greater safety, and ease of integration to into electronics.
In this dissertation, I have proposed improving the energy and power density of supercapacitors by exploring nano-composite structures where low cost transition metal oxides are combined with three dimensional, high specific surface area and conducting carbon nanotubes (CNTs) to achieve the high performance, advanced devices. This has been achieved using 3 different configurations: a) planar supercapacitors; b) micropatterned 3D supercapacitors; and c) solid-state supercapacitors.
Manganese dioxide deposition was achieved by optimizing an electrochemical technique using potassium permanganate and cyclic voltammetry. This technique results in-situ reduction of KMnO4 on the CNT surface to form MnO2 film; thus providing excellent control on the thickness and reproducibility. Such a MnO2/CNT architecture is beneficial for energy storage performance by virtue of reduced ion diffusion lengths, facile electron transfer kinetics, lower electrical contact resistance, and high specific surface area In addition, this approach eliminates the use of binders and/or any other additives.
CNTs were synthesized on flexible graphite substrates to develop single sided and double-sided electrodes using low-cost thermal chemical vapor deposition (T-CVD) technique. A supercapacitor prototype cell was designed and fabricated using a stack of multiple, double-sided electrodes yielding high capacitance value of 3.7 F at 2 mV/s. A low equivalent series resistance (ESR) value of 0.8 Ω yields a maximum specific power value of 68.5 kW.kg-1 and a maximum specific energy of 111.6 Wh.kg-1 at 2.5V.
Conventional silicon microfabrication process, hot filament CVD technique for CNT synthesis and the electrochemical technique for MnO2 deposition were combined to fabricate a novel 3D micropatterned supercapacitor electrodes that can deliver very high volumetric capacitance of 240 F/cm3 or high capacitance of 1.85 F/cm2.
A new, efficient, simple and low-cost process has been developed for the fabrication of solid-state supercapacitors utilizing H3PO4/PVA solid polymer electrolyte. The resulting supercapacitor prototype yielded a very high capacitance value of 1.4 F or…
Advisors/Committee Members: Yaqiong Xu (committee member), Richard Mu (committee member), Deyu Li (committee member), Bharat Bhuva (committee member), Supil Raina (Committee Chair), Weng Poo Kang (Committee Chair).
Subjects/Keywords: Hybrid Supercapacitors; Ultracapacitors; Transition Metal Oxides; Electrochemistry; Manganese Dioxide; Carbon Nanotubes; Supercapacitors
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Akbulut, S. (2017). Carbon Nanotubes/Manganese Dioxide Nano-Structured Planar Macro, 3D Micro, and Solid-State Supercapacitors. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/12637
Chicago Manual of Style (16th Edition):
Akbulut, Serkan. “Carbon Nanotubes/Manganese Dioxide Nano-Structured Planar Macro, 3D Micro, and Solid-State Supercapacitors.” 2017. Doctoral Dissertation, Vanderbilt University. Accessed January 27, 2021.
http://hdl.handle.net/1803/12637.
MLA Handbook (7th Edition):
Akbulut, Serkan. “Carbon Nanotubes/Manganese Dioxide Nano-Structured Planar Macro, 3D Micro, and Solid-State Supercapacitors.” 2017. Web. 27 Jan 2021.
Vancouver:
Akbulut S. Carbon Nanotubes/Manganese Dioxide Nano-Structured Planar Macro, 3D Micro, and Solid-State Supercapacitors. [Internet] [Doctoral dissertation]. Vanderbilt University; 2017. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1803/12637.
Council of Science Editors:
Akbulut S. Carbon Nanotubes/Manganese Dioxide Nano-Structured Planar Macro, 3D Micro, and Solid-State Supercapacitors. [Doctoral Dissertation]. Vanderbilt University; 2017. Available from: http://hdl.handle.net/1803/12637
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