Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"vapor-liquid-solid"”.
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Structure/processing relationships in vapor-liquid-solid nanowire epitaxy
The synthesis of Si and III-V nanowires using the vapor-liquid-solid (VLS) growth mechanism and low-cost Si substrates was investigated. The VLS mechanism allows fabrication of heterostructures which are not readily attainable using traditional thin-film metalorganic chemical vapor deposition …
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Orientation Controllable Epitaxial Vapor-Liquid-Solid Semiconductor Nanowire Synthesis on Silicon Substrate
<p>Semiconductor nanowires synthesized via the vapor-liquid-solid (VLS) mechanism have attracted extensive research interest in recent years owing to their unique structure as a promising candidate for the future electronic devices. Germanium and silicon nanowires, in particular, are compatible …
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Vapor-liquid-solid (VLS) growth of lead chalcogenide thin films for infrared sensing applications
… modest cooling requirements. Adapting the vapour-liquid-solid (VLS) growth mechanism traditionally used for growing nanowires to growing PbSe thin films circumvents the very slow adsorption of a gas phase into a solid surface by introducing a catalytic liquid alloy phase, while simultaneously …
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Optical properties of SiGe nanostructures
… measurements of Ge nanowires (NWs) grown via vapor-liquid-solid (VLS) using chemical vapor deposition silicon substrates consisting of (100) and (111) crystallographic orientations are reported. Ge NWs grown are ~40 nm in diameter, approximately a micrometer in length, and a sharp narrow Raman …
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Quantitative Fracture Strength of Lithiated Tin Oxide Nanowires by In-Situ SEM Tensile Experiments
… The SnO2 nanowires were synthesized using the vapor-liquid-solid (VLS) growth mechanism on stainless steel substrates using a gold (Au) catalyst. Ex-situ lithiation of the SnO2 nanowires was performed directly using the stainless steel growth substrates by the electrochemical half-cell method …
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Synthesis and surface chemistry of zinc oxide nanowires for chemical sensor applications
… for highly sensitive and selective p-nitrophenol vapor sensor. High-quality ZnO nanowires were synthesized through a vapor-liquid-solid process in a customized chemical vapor deposition furnace. Scanning electron microscopy, transmission electron microscopy, x-ray diffraction, and energy …
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Towards in-situ device fabrication : electrostatic lithography and nanowire field effect devices
… from semiconducting nanowires grown using vapor-liquid-solid mechanism was also developed. The technique involves source, drain, gate-oxide and gate material fabrication using electron beam induced chemical vapor deposition. Field effect transistor and ring oscillator architectures were …
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Conformational and Structural Determinations of Substituted Four and Five Membered Rings by Infrared, Raman, and Microwave Spectral Studies
… far-infrared, and Raman spectroscopy to of vapor, liquid, solid, and rare gas solutions to determine vibrational assignments, conformational stabilities, and even some structural parameters. We combine this vibrational approach with ab initio calculations and microwave spectroscopy for …
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Planar GaAs nanowire arrays for nanoelectronics: controlled growth, doping, characterization, and devices
The Vapor-Liquid-Solid (VLS) mechanism is a bottom-up approach to produce one-dimensional semiconductor structures, or nanowires. VLS nanowires are formed via a chemical or physical deposition process, where a metallic nanoparticle (seed) facilitates the growth. Nanowire growth diameter is strongly …
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A Study of the Nucleation and Formation of Multi-functional Nanostructures using GaN-Based Materials for Device Applications
… whereas, metallic droplet method (i.e. Vapor-Liquid-Solid method) was employed in the lattice matched system (i.e. GaN nanostructure / AlGaN). The nanostructure size is adjustable by changing growth parameters (height: 2 ~ 15nm and diameter: 10 ~ 100nm). It has been found that the photon …
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Thermal conductivity/diffusivity of SiC-Mullite and SiC-SiC composites
… SiC whiskers (prepared from rice hulls or by the vapor-liquid-solid process) dispersed within a polycrystalline mullite matrix. During measurement of thermal diffusivity, the samples were heated to l500°C and cooled back to room temperature. No hysteresis occurred. However, both thermal …
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Array-based planar nanowire high electron mobility transistor
… digital/RF IC. Bottom-up grown NWs via the vapor-liquid-solid (VLS) mechanism are of particular interest for NW-FET application because the as-grown 3D NW structures require no lithography or chemical etching to define. However, fabricating bottom-up NW-FETs and circuits in wafer-scale is …
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In-fiber semiconductor filament arrays
… devices. Conventional bottom-up methods such as vapor-liquid-solid growth have been widely applied for the fabrication of uniform and high quality nanowires. Two challenges toward nanoelectronics and other applications remain: on the single-nanowire level, precisely manipulating an individual …
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Fundamental studies on surface chemistry and interfacial interactions of nanoscale heterostructures for chemical sensing, photocatalysis, and thermal transport management
… surface chemistry: fabrication (Chemical Vapor Deposition or CVD) and controlled patterning of graphene encapsulated gold nanoparticles (referred as graphene nanoparticles or GNPs) on silicon substrate and their surface functionalization with DNA, external nanoparticles, or semiconducting …
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CO2 Separation Using Regenerable Magnesium Solutions Dissolution, Kinectics and VLSE Studies
… subsequent chemical reactions in the aqueous and solid phases. Three critical phenomena influencing the CO2 absorption process, namely: the dissolution of Mg(OH)2 for continuous CO2 absorption, formation of an unwanted by-product magnesium carbonate (MgCO3), and vapor-liquid-solid equilibrium …
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Nanoscale quantification of stress and strain in III-V semiconducting nanostructures
… nanowires grown by a particle-mediated vapor-liquid-solid mechanism. By comparing our experimental results to strain fields calculated by finite element analysis, we show that these techniques can provide quantitative strain information with spatial resolutions on the order of 1 nm. Our …
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Growth Model, Synthesis of Carbon Nanostructures and Alteration of Surface Properties Using Them
… conventional catalytic processes like chemical vapor deposition (CVD). Nanostructured carbon materials, such as carbon nanotubes and nanofibers, exhibit superhydrophobic behavior over a range of pH values, including for corrosive liquids. Part of this research reports the development of a rapid …
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Silicon-germanium nanowire heterojunctions: Optical and electrical properties
… are produced by catalytic chemical vapor deposition employing vapor-liquid-solid mechanism on (111) oriented p-type Si substrate, and they exhibit unique structural properties including highly localized strain, and short-range interdiffusion/intermixing revealed by transmission …
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Three-dimensional field-effect transistors with top-down and bottom-up nanowire-array channels
… The GaAs NWs assemble by lateral epitaxy via a vapor-liquid-solid mechanism and align in parallel arrays as a result of the (100) GaAs crystal plane orientation; then, a thin-film AlGaAs layer conforms to the GaAs NWs to form AlGaAs/GaAs NW high-electron mobility channels. Radio frequency (RF) …
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