Metal-semiconductor Transitions in Nanoscale Vanadium Dioxide PDF Download

Author: Eugenii U. Donev
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 185

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Author: Douglas Craig Barnard
Publisher:
ISBN:
Category : Semiconductors
Languages : en
Pages : 66

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Author: Martin I. Pech-Canul
Publisher: Springer
ISBN: 3030021718
Category : Technology & Engineering
Languages : en
Pages : 596

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This book is a practical guide to optical, optoelectronic, and semiconductor materials and provides an overview of the topic from its fundamentals to cutting-edge processing routes to groundbreaking technologies for the most recent applications. The book details the characterization and properties of these materials. Chemical methods of synthesis are emphasized by the authors throughout the publication. Describes new materials and updates to older materials that exhibit optical, optoelectronic and semiconductor behaviors; Covers the structural and mechanical aspects of the optical, optoelectronic and semiconductor materials for meeting mechanical property and safety requirements; Includes discussion of the environmental and sustainability issues regarding optical, optoelectronic, and semiconductor materials, from processing to recycling.

Author: René López Noriega
Publisher:
ISBN:
Category : Nanostructured materials
Languages : en
Pages : 182

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Author: David L. Andrews
Publisher: John Wiley & Sons
ISBN: 1119011760
Category : Technology & Engineering
Languages : en
Pages : 544

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Discusses the basic physical principles underlying thetechnology instrumentation of photonics This volume discusses photonics technology and instrumentation. Thetopics discussed in this volume are: Communication Networks; DataBuffers; Defense and Security Applications; Detectors; FiberOptics and Amplifiers; Green Photonics; Instrumentation andMetrology; Interferometers; Light-Harvesting Materials; LogicDevices; Optical Communications; Remote Sensing; Solar Energy;Solid-State Lighting; Wavelength Conversion Comprehensive and accessible coverage of the whole of modernphotonics Emphasizes processes and applications that specifically exploitphoton attributes of light Deals with the rapidly advancing area of modern optics Chapters are written by top scientists in their field Written for the graduate level student in physical sciences;Industrial and academic researchers in photonics, graduate studentsin the area; College lecturers, educators, policymakers,consultants, Scientific and technical libraries, governmentlaboratories, NIH.

Author: John R. Vacca
Publisher: CRC Press
ISBN: 0429531079
Category : Computers
Languages : en
Pages : 431

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This comprehensive handbook serves as a professional reference as well as a practitioner's guide to today's most complete and concise view of nanoscale networking and communications. It offers in-depth coverage of theory, technology, and practice as they relate to established technologies and recent advancements. It explores practical solutions to a wide range of nanoscale networking and communications issues. Individual chapters, authored by leading experts in the field, address the immediate and long-term challenges in the authors' respective areas of expertise.

Author: Xuefei Li
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Nanomaterials provide exciting opportunities for the understanding and realization of their distinctive properties derived from the nanoscale dimensions. Vanadium dioxide (VO2) materials that exhibit metal-insulator transition (MIT) properties, with coupled structural transformations and abrupt changes in electrical and optical properties, serve as an example of such materials with unique fundamental dynamics and distinct properties at reduced dimensions.To illustrate the fundamental transition mechanisms on the nanoscale, and to construct switchable building blocks that can be integrated into nanoelectronic and nano-optical devices, advancements of synthesis routes to nanoscale VO2 materials need to be developed by overcoming intrinsic synthetic challenges associated with the stoichiometry and phase control. In this dissertation, I present such strategies for synthesizing VO2 nanostructures.This dissertation starts with an overview of nanomaterials syntheses in chapter 1, with emphasis on the synthesis of nanoscale heterostructures, post-synthetic composition and phase engineering of nanostructures via cation exchange processes, and the metal-insulator transition properties of the VO2 nanostructures. In chapter 2, I demonstrate a pathway to synthesize complex heterostructures enabled by Ag-Au-S reactive synthons, utilizing the phase segregation and cation exchange based methods introduced in chapter 1. The following chapters focus on strategies for the solution-based synthesis of VO2 nanostructures. Chapter 3 demonstrates a seeded approach for synthesizing VO2-TiO2-VO2 heterostructures, where VO2 domains nucleate and grow epitaxially on TiO2 nanorod seeds. The metal-insulator transition properties of the VO2 domains can be modulated by controlling the VO2 domain sizes as well as the TiO2-VO2 interfacial features. Chapter 4 describes a ZnO-templated synthesis of amorphous, morphologically pre-defined VO2 nanostructures, which can be thermally converted to crystalline VO2 nanostructures exhibiting metal-insulator transition properties. Chapter 5 demonstrates the synthesis of Mo-doped VO2 nanorod structures that are seeded by epitaxial MoO2 nanostructures, with controlled metal-insulator transition temperature as a function of Mo dopant distribution and concentration. This dissertation is summarized by Chapter 6, which provides insights into emerging fields of study enabled by expanded capabilities for synthesizing VO2 nanostructures.

Author: Boris I. Kharisov
Publisher: CRC Press
ISBN: 1439853444
Category : Science
Languages : en
Pages : 859

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Book Description
As nanotechnology has developed over the last two decades, some nanostructures, such as nanotubes, nanowires, and nanoparticles, have become very popular. However, recent research has led to the discovery of other, less-common nanoforms, which often serve as building blocks for more complex structures. In an effort to organize the field, the Handbook of Less-Common Nanostructures presents an informal classification based mainly on the less-common nanostructures. A small nanotechnological encyclopedia, this book: Describes a range of little-known nanostructures Offers a unifying vision of the synthesis of nanostructures and the generalization of rare nanoforms Includes downloadable resources with color versions of more than 100 nanostructures Explores the fabrication of rare nanostructures, including modern physical, chemical, and biological synthesis techniques The Handbook of Less-Common Nanostructures discusses a classification system not directly related to the dimensionality and chemical composition of nanostructure-forming compounds or composite. Instead, it is based mainly on the less-common nanostructures. Possessing unusual shapes and high surface areas, these structures are potentially very useful for catalytic, medical, electronic, and many other applications.

Author: Tyler J. Huffman
Publisher:
ISBN:
Category : Physics
Languages : en
Pages :

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The salient feature of the familiar structural transition accompanying the thermally-driven metal-insulator transition in bulk vanadium dioxide (VO2) is a pairing of all the vanadium ions in the monoclinic M¬1 insulating phase. Whether this pairing (unit cell doubling) alone is sufficient to open the energy gap has been the central question of a classic debate which has continued for almost sixty years. Interestingly, there are two less familiar insulating states, monoclinic M2 and triclinic, which are accessible via strain or chemical doping. These phases are noteworthy in that they exhibit distinctly different V-V pairing. With infrared and optical photon spectroscopy, we investigate how the changes in crystal structure affect the electronic structure. We find that the energy gap and optical inter-band transitions are insensitive to changes in the vanadium-vanadium pairing. This result is confirmed by DFT+U and HSE calculations. Hence, our work conclusively establishes that intra-atomic Coulomb repulsion between electrons provides the dominant contribution to the energy gap in all insulating phases of VO2. VO2 is a candidate material for novel technologies, including ultrafast data storage, memristors, photonic switches, smart windows, and transistors which move beyond the limitations of silicon. The attractiveness of correlated materials for technological application is due to their novel properties that can be tuned by external factors such as strain, chemical doping, and applied fields. For advances in fundamental physics and applications, it is imperative that these properties be measured over a wide range of regimes. Towards this end, we study a single domain VO2 crystal with polarized light to characterize the anisotropy of the optical properties. In addition, we study the effects of compressive strain in a VO2 thin film in which we observe remarkable changes in electronic structure and transition temperature. Furthermore, we find evidence that electronic correlations are active in the metallic rutile phase as well. VO2 films exhibit phase coexistence in the vicinity of the metal-insulator transition. Using scanning near-field infrared microscopy, we have studied the patterns of phase coexistence in the same area on repeated heating and cooling cycles. We find that the pattern formation is reproducible each time. This is an unexpected result from the viewpoint of classical nucleation theory that anticipates some degree of randomness. The completely deterministic nature of nucleation and growth of domains in a VO2 film with imperfections is a fundamental finding. This result also holds promise for producing reliable nanoscale VO2 devices.

Author: Lukas Novotny
Publisher: Cambridge University Press
ISBN: 1107005469
Category : Science
Languages : en
Pages : 583

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Book Description
Fully revised and in its second edition, this standard reference on nano-optics is ideal for graduate students and researchers alike.