Download or read book Localized Synthesis Assembly and Integration of Silicon Nanowires written by Ongi Englander and published by . This book was released on 2005 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Localized Synthesis of Silicon Nanowires for Direct Integration with Larger Scale Systems written by Ongi Englander and published by . This book was released on 2003 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Assembly and Integration of Semiconductor Nanowires written by Elena P. Pandres and published by . This book was released on 2020 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductor nanowires are a class of highly anisotropic crystalline materials with nanoscale diameters and lengths that range from micrometers to millimeters. The electronic, optical, and mechanical properties of semiconductor nanowires can be considerably different than their bulk counterparts, making them attractive for a range of applications including sensors, energy storage, and quantum information systems. Solution-based synthesis is a promising strategy to produce semiconductor nanowires in a scalable, cost-effective matter. However, many solution-based methods are limited in their ability to produce nanowires with increasingly complex compositions-including doped, alloyed, and heterostructured architectures-as well as to rapidly screen synthetic parameters for combinatorial discovery and optimization. In addition, chemistries and growth dynamics can be difficult to track with nanowire syntheses that require high temperature and extreme pressure equipment. Moreover, the widespread integration of semiconductor nanowires into devices will also require new methods of assembly as well as careful consideration of surface chemistry. After an introduction to current methods of semiconductor nanowire synthesis, existing tactics for nanowire assembly, and strategies to improve the energy density of lithium ion batteries with group IV nanomaterials, this dissertation will cover three main topics related to (i) new synthetic methods for nanowire growth, (ii) a novel light-based nanowire assembly process, and (iii) the integration of nanowires into high-energy-density composite electrodes for lithium ion batteries. Herein, we demonstrate a new continuous-flow, laser-driven, nanowire growth process that exploits the light absorption of colloidal metal nanocrystals to drive semiconductor nanowire growth in an optically accessible reactor on the benchtop, potentially opening the door for both rapid screening of synthetic parameters as well as in situ studies of nanowire growth dynamics. Investigations of solution-based nanowire growth using this system establish that laser-driven syntheses can achieve rapid, on-demand growth of semiconductor nanowires. Importantly, the integration of nanowires into future device architectures will require a wide range of assembly strategies. While current solution-based nanowire assembly processes struggle to create deterministic heterojunctions, here, we demonstrate a novel example of nanowire assembly in a high-Prandtl-number organic solvent system, using an optical trap to orient, align, and "solder" metal-seeded semiconductor nanowires into periodic axial heterostructures. Finally, we investigate the role of surface functionalization on the integration of group-IV nanowires into high-capacity alloying electrodes for lithium ion batteries. We demonstrate that interfacial chemistry affects electrochemical access to different phases of lithiated germanium, and by carefully controlling the nanowire surface chemistry, we eliminate the need for the fluorinated electrolyte additives typically required for the stable cycling of group-IV-based, lithium-ion battery electrodes. In addition, we demonstrate that by balancing precursor decomposition kinetics, alloyed silicon-germanium (SiGe) nanowires can be synthesized through supercritical-fluid-based processes, potentially improving the rate capability of high-capacity silicon-based electrode materials produced via scalable processes. We anticipate that the information gained from these solution-based synthetic methods, assembly techniques, and surface chemistry studies will inform synthetic compositional control, elucidate relationships between solution-based reaction parameters and emergent properties, and advance the integration of solution-grown semiconductor nanowires into next-generation devices.
Download or read book Localized Synthesis Assembly and Application of Carbon Nanotubes written by Dane Tipton Christensen and published by . This book was released on 2005 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Integration of Silicon Nanowires for Nanosystems Technology written by Gregory Stephen Doerk and published by . This book was released on 2010 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silicon's chemical stability, high natural abundance (as the second most common element in the earth's crust), mechanical stiffness, and semiconducting behavior have made it the subject of extensive scientific investigation and the material of choice for both the microelectronics and microelectromechanical device industries. The success of Moore's Law that demands continual size reduction has directed it to a central place in emerging nanoscience and nanotechnology as well. Crystalline nanowires (NWs) are one nanostructured form that silicon may take that has sparked significant interest as they can exhibit considerable confinement effects and high surface-to-volume ratios, but may be interfaced simply along one direction for the determination of material properties and implementation into new technologies. The expense and difficulty involved in the creation of semiconductor nanowires using the "top down" fabrication techniques of the microelectronics industry has promoted an explosion of chemical synthetic "bottom up" techniques to produce high quality crystalline nanowires in large quanitities. Nevertheless, bottom up synthesized Si NWs retain a new set of challenges for their successful integration into reliable, high-performance devices, which is hindered by an incomplete understanding of the factors controlling their material properties. The first chapter of this dissertation introduces the motivation for studying semiconductor NWs and the benefits of limiting the scope to silicon alone. A brief survey of the current understanding of thermal conductivity in silicon nanowires provides prime examples of how confinement effects and surface morphology may dramatically alter nanowire properties from their bulk crystal counterparts. The particular challenges to bottom up silicon nanowire device integration and characterization are noted, especially related to Si nanowires that are grown epitaxially on crystal silicon substrates, and Raman spectroscopy is introduced as a promising optical characterization and metrology tool for semiconductor nanowire based devices. Chapter two describes the vapor-liquid-solid (VLS) mechanism for the synthesis of very high quality, single-crystal silicon nanowires using Au and Pt catalyst nanoparticles. A new technique is presented for the simplified synthesis of branched silicon nanowires based on the migration of Au catalyst during an hydrogen anneal intermediate between growth stages, and the faceting behavior at synthetic stages is revealed by the analysis of electron microscope images. Synthesis of solid and porous Si nanowires based on Ag mediated electrochemical silicon etching is described as well. The third chapter specifies new processing techniques developed with future device integration of epitaxially VLS-grown Si nanowires in mind. Epitaxially bridging nanowires are shown to provide an excellent platform for single-wire electrical and mechanical property measurements. Galvanic displacement through block copolymer micelle/homopolymer surface templates is demonstrated as a means to deposit catalyst nanoparticles with controlled sizes and areal densities in a variety of geometries and with registration to photolithographic patterns. Ex situ boron doping by the direct hydrogen reduction of boron tribromide is shown to achieve active concentrations exceeding 1019 cm-3 with high axial uniformity, while avoiding the adverse impact on nanowire morphology that is often observed with in situ boron doping of silicon nanowires. Chapter four describes the characteristics of Raman spectroscopy that are relevant to studying individual semiconductor nanowires. Careful spectral measurements show that the anharmonic dependence of Raman spectra on temperature for individual Si nanowires remains unchanged from the bulk crystal for diameters down to 30 nm, regardless of surface morphology. Using this result, a new technique for measuring the thermal conductivity of individual semiconductor nanowires is then outlined based on Raman thermal mapping of individual cantilevered nanowires. Finally, the dissertation is concluded with suggestions for possible future experiments. One avenue is to probe more deeply the morphology of faceted silicon nanowires and nanotrees and its impact on their transport physics. Another possible route for further study would be to explore new characterization and metrological applications of Raman spectrocopy for semiconductor nanowires.
Download or read book Towards Silicon Nanowire Based Resonant Systems written by Noel Arellano and published by . This book was released on 2008 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Integration of Dielectrophoretic Assembly of Silicon Nanowires in CMOS Circuitry written by Robert George Heinrich Crow and published by . This book was released on 2005 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Well Organized Inorganic Nanowire Films written by Jian-Wei Liu and published by Springer. This book was released on 2017-03-01 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents the latest findings on macroscopic-scale nanowire thin films composed of integrated nanowires. It introduces readers to essential synthesis and assembly strategies for the design and fabrication of high-quality nanowire thin films, and discusses their underlying principles in detail. The book highlights examples specific to well-aligned nanowire systems, and explores the applications of nanowire systems, including memory devices, flexible transparent electrodes, etc. The book offers a valuable resource for researchers and graduate students working in materials science, especially in nanowire device fabrication.
Download or read book Nanowires Synthesis Properties Assembly and Applications written by Yi Cui and published by Cambridge University Press. This book was released on 2014-06-05 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: Given the interest, fascination, and rapid development in the field of nanowires, this book offers a well-timed overview of critical issues related to nanowires, as well as recent progress in synthesis, structure, properties and devices. Topics include: synthesis, with control over composition, size, shape, position, geometry, doping, alloying, and heterostructures; properties - mechanical, electronic, optical, thermal, magnetic, ionic, phase transformational, and chemical; assembly and integration - methods for organizing nanowires, multiple length scale pattern formation, heterogeneous integration, and assembly architecture; and applications - functional devices and systems for electronics, photonics, sensors, and renewable energy.
Download or read book Digest of Technical Papers written by and published by . This book was released on 2003 with total page 1020 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Novel Approach to the Synthesis of Silicon Nanowires written by Joo Chick Chan and published by . This book was released on 2008 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aspects of Bottom up Engineering written by Reken Niranjan Patel and published by . This book was released on 2010 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: Central to the implementation of colloidal nanomaterials in commercial applications is the development of high throughput synthesis strategies for technologically relevant materials. Solution based synthesis approaches provide the controllability, high throughput, and scalability needed to meet commercial demand. A flow through supercritical fluid reactor was used to synthesize silicon nanowires in high yield with production rates of ~45 mg/hr. The high temperature and high pressure of the supercritical medium facilitated the decomposition of monophenylsilane and seeded growth of silicon nanowires by gold seeds. Crystalline nanowires with diameters of ~25 nm and lengths greater than 20 micrometers were routinely synthesized. Accumulation of nanowires in the reactor resulted in deposition of a conformal amorphous shell on the crystalline surface of the wire. X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and energy dispersive X-ray spectroscopy were used to determine the shell composition. The shell was identified as polyphenylsilane formed by polymerization of the silicon precursor monophenylsilane. A post synthesis etch was developed to remove the shell while still maintaining the integrity of the crystalline silicon nanowire core. Subsequent surface passivation was achieved through thermal hydrosilylation with a terminal alkene. The development colloidal nanomaterials into commercial applications also requires simple and robust bottom-up assembly strategies to facilitate device fabrication. A Langmuir-Blodgett trough was used to assemble continuous monolayers of hexagonally ordered spherical nanocrystals over areas greater than 1 cm2. Patterned monolayers and multilayers of FePt nanocrystals were printed onto substrates using pre-patterned polydimethylsiloxane (PDMS) stamps and a modified Langmuir Schaefer transfer technique. Patterned features, including micrometer-size circles, lines, and squares, could be printed using this approach. The magnetic properties of the printed nanocrystal films were also measured using magnetic force microscopy (MFM). Room temperature MFM could detect a remanent (permanent) magnetization from multilayers (>3 nanocrystals thick) films of chemically-ordered L10 FePt nanocrystals. Grazing incidence small angle X-ray scattering was used to quantitatively characterize the grain size, crystal structure, lattice disorder, and edge-to-edge spacing of the nanocrystal films prepared on the Langmuir-Blodgett trough both on the air-water interface and after transfer.
Download or read book Synthesis Integration and Application of ZnO Nanowires written by Lei Luo and published by . This book was released on 2007 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Emerging Solar Energy Materials written by Sadia Ameen and published by BoD – Books on Demand. This book was released on 2018-08-01 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the fundamental understanding of the functioning of solar cellsand the materials for the effective utilization of energy resources. The main objective of writing this book is to create a comprehensive and easy-to-understand source of information on the advances in the rapidly growing research on solar cells. Emerging Solar Energy Materials comprises 12 chapters written by the experts in the solar cell field and is organized with the intention to provide a big picture of the latest progress in the solar cell field and at the same time give an in-depth discussion on fundamentals of solar cells for interested audiences. In this book, each part opens with a new author's essay highlighting their work for contribution toward solar energy. Critical, cutting-edge subjects are addressed, including: Photovoltaic device technology and energy applications; Functional solar energy materials; New concept in solar energy; Perovskite solar cells; Dye-sensitized solar cells; Organic solar cells; Thin-film solar cells. The book is written for a large and broad readership including researchers and university graduate students from diverse backgrounds such as chemistry, physics, materials science, and photovoltaic device technology. The book includes enough information on the basics to be used as a textbook undergraduate coursework in engineering and the sciences.
Download or read book Synthesis and Characterization of Silicon Nanowires and Silicon Nanowire Based Field Effect Transistor written by Jing Lei Xiang and published by . This book was released on 2008 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Silicon Nanowires written by Volker Schmidt and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis of Silicon Nanowires and Its Field Emission Properties Analysis written by 鄒宗昕 and published by . This book was released on 2007 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
