A Mechanistic Approach For The Preparation Of Chemical Vapor Deposited Isotropic And Anistropic Boron Nitride
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A Mechanistic Approach For The Preparation Of Chemical Vapor Deposited Isotropic And Anistropic Boron Nitride
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Author : Louis E. Branovich
language : en
Publisher:
Release Date : 1971
A Mechanistic Approach For The Preparation Of Chemical Vapor Deposited Isotropic And Anistropic Boron Nitride written by Louis E. Branovich and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with categories.
The properties, such as density and dielectric constant, of materials prepared by the CVD depend upon reaction parameters, such as pressure and temperature. The degree of anistropy of the CVD products depends primarily upon the initial reactants and secondarily upon the reaction parameters of temperature and pressure. In the report the preparation of anistropic and isotropic boron nitride (BN) is described. Two methods of preparation of the anistropic material have been investigated. One method uses ammonia and boron trichloride as the starting materials while the second method begins with beta-trichloroborazole. It will be shown that beta-trichloroborazole is a logical intermediate of the ammonia-boron trichloride system and that the two methods are, therefore, essentially equivalent. A theory is presented that not only accounts for the fact that BN formation occurs only at the hot substrate but is capable of predicting the requirements for the formation of the isotropic or anistropic forms. It should be shown that at the hot substrate a surface reaction takes place that results in the deposition of BN in an ordered anistropic form. In the reaction used for the formation of anistropic BN, water vapor is not present to disturb the initial anistropy. (Author).
Chemical Vapor Deposition 1960 1980
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Author : Donald T. Hawkins
language : en
Publisher: Springer
Release Date : 1981-11-30
Chemical Vapor Deposition 1960 1980 written by Donald T. Hawkins and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981-11-30 with Reference categories.
Preparation Of Chemical Vapor Deposited Materials For Use In Field Enhanced Electron Emission Studies
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Author : David G. MCMaster
language : en
Publisher:
Release Date : 1966
Preparation Of Chemical Vapor Deposited Materials For Use In Field Enhanced Electron Emission Studies written by David G. MCMaster and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with categories.
The general principles of chemical vapor deposition (CVD) are described and specific experimental results on the deposition of pyrolytic graphite, of CVD boron nitride, and of CVD tungsten on tungsten substrates are discussed. In order to obtain uniform anisotropic, thin films of pyrolytic graphite and CVD boron nitride, the deposition parameters such as deposition temperature, concentration of the gaseous reactants, and gas flow pattern were varied, and their influence on the deposits was studied. It was found that the uniformity of pyrolytic graphite can be increased by using high total gas flow rates and low methane concentrations. The most uniform CVD-boron nitride deposits were obtained under the following conditions: Temperature: 1600C; Gas flow rate (cc/min): ammonia 10, boron trichloride 6, nitrogen 4. The deposits of pyrolytic graphite and CVD boron nitride exhibited a high degree of anisotropy. Thin-film sandwich structures of pyrolytic graphite and CVD boron nitride were successfully produced. Preliminary tests have been performed with CVD tungsten. (Author).
Method Of Depositing Isotropic Boron Nitride
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Author : Louis E. Branovich
language : en
Publisher:
Release Date : 1972
Method Of Depositing Isotropic Boron Nitride written by Louis E. Branovich and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with categories.
Chemical vapor deposited isotropic boron nitride is formed on the inner walls of a reaction chamber by forming a vapor mixture of an oxygen containing organic boron compound with ammonia and reacting the vapor mixture in said reaction chamber at about 1100 degrees C. to about 1900 degrees C. at pressures of about one torr to atmospheric.
Method For The Synthesis Of Cubuc Boron Nitride By Chemical Vapor Deposition
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Author : A. Ikegaya
language : en
Publisher:
Release Date : 1987
Method For The Synthesis Of Cubuc Boron Nitride By Chemical Vapor Deposition written by A. Ikegaya and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.
Functionalization Of Graphene
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Author : Vasilios Georgakilas
language : en
Publisher: John Wiley & Sons
Release Date : 2014-04-03
Functionalization Of Graphene written by Vasilios Georgakilas and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-04-03 with Science categories.
All set to become the standard reference on the topic, this book covers the most important procedures for chemical functionalization, making it an indispensable resource for all chemists, physicists, materials scientists and engineers entering or already working in the field. Expert authors share their knowledge on a wide range of different functional groups, including organic functional groups, hydrogen, halogen, nanoparticles and polymers.
Carbon Nanotubes And Graphene
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Author : Kazuyoshi Tanaka
language : en
Publisher: Newnes
Release Date : 2014-07-10
Carbon Nanotubes And Graphene written by Kazuyoshi Tanaka and has been published by Newnes this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-07-10 with Science categories.
Carbon Nanotubes and Graphene is a timely second edition of the original Science and Technology of Carbon Nanotubes. Updated to include expanded coverage of the preparation, purification, structural characterization, and common application areas of single- and multi-walled CNT structures, this work compares, contrasts, and, where appropriate, unitizes CNT to graphene. This much expanded second edition reference supports knowledge discovery, production of impactful carbon research, encourages transition between research fields, and aids the formation of emergent applications. New chapters encompass recent developments in the theoretical treatments of electronic and vibrational structures, and magnetic, optical, and electrical solid-state properties, providing a vital base to research. Current and potential applications of both materials, including the prospect for large-scale synthesis of graphene, biological structures, and flexible electronics, are also critically discussed. Updated discussion of properties, structure, and morphology of biological and flexible electronic applications aids fundamental knowledge discovery Innovative parallel focus on nanotubes and graphene enables you to learn from the successes and failures of, respectively, mature and emergent partner research disciplines High-quality figures and tables on physical and mathematical applications expertly summarize key information – essential if you need quick, critically relevant data
Advanced Techniques For Surface Engineering
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Author : W. Gissler
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-04-17
Advanced Techniques For Surface Engineering written by W. Gissler and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-04-17 with Technology & Engineering categories.
Today's shortages of resources make the search for wear and corrosion resistant materials one of the most important tasks of the next century. Since the surface of a material is the location where any interaction occurs, it is that there the hardest requirements on the material are imposed: to be wear resistant for tools and bearings; to be corrosion resistant for turbine blades and tubes in the petrochemical industry; to be antireflecting for solar cells; to be decorative for architectural panels and to combine several of these properties in other applications. Surface engineering is the general term that incorporates all the techniques by which a surface modification can be accomplished. These techniques include both coating and modification of the surface by ion implantation and laser beam melting. In recent years a continuously growing number of these techniques were developed to the extent that it became more and more difficult to maintain an overlook and to understand which of these highly differentiated techniques might be applied to resolve a given surface engineering problem. A similar development is also occuring for surface characterization techniques. This volume contains contributions from renowned scientists and engineers to the Eurocourse the aim of which was to inform about the various techniques and to give a comprehensive survey of the latest development on this subject.
Covalent Organic Frameworks
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Author : Atsushi Nagai
language : en
Publisher: CRC Press
Release Date : 2019-12-19
Covalent Organic Frameworks written by Atsushi Nagai and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-12-19 with Science categories.
Rational synthesis of extended arrays of organic matter in bulk, solution, crystals, and thin films has always been a paramount goal of chemistry. The classical synthetic tools to obtain long-range regularity are, however, limited to noncovalent interactions, which usually yield structurally more random products. Hence, a combination of porosity and regularity in organic covalently bonded materials requires not only the design of molecular building blocks that allow for growth into a nonperturbed, regular geometry but also a condensation mechanism that progresses under reversible, thermodynamic, self-optimizing conditions. Covalent organic frameworks (COFs), a variety of 2D crystalline porous materials composed of light elements, resemble an sp2-carbon-based graphene sheet but have a different molecular skeleton formed by orderly linkage of building blocks to constitute a flat organic sheet. COFs have attracted considerable attention in the past decade because of their versatile applications in gas storage and separation, catalysis, sensing, drug delivery, and optoelectronic materials development. Compared to other porous materials, COFs allow for atomically precise control of their architectures by changing the structure of their building blocks, whereby the shapes and sizes of their pores can be well-tuned. Covalent Organic Frameworks is a compilation of different topics in COF research, from COF design and synthesis, crystallization, and structural linkages to the theory of gas sorption and various applications of COFs, such as heterogeneous catalysts, energy storage (e.g., semiconductors and batteries), and biomedicine. This handbook will appeal to anyone interested in nanotechnology and new materials of gas adsorption and storage, heterogeneous catalysts, electronic devices, and biomedical devices.
Chemically Deposited Nanocrystalline Metal Oxide Thin Films
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Author : Fabian I. Ezema
language : en
Publisher: Springer Nature
Release Date : 2021-06-26
Chemically Deposited Nanocrystalline Metal Oxide Thin Films written by Fabian I. Ezema and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-06-26 with Technology & Engineering categories.
This book guides beginners in the areas of thin film preparation, characterization, and device making, while providing insight into these areas for experts. As chemically deposited metal oxides are currently gaining attention in development of devices such as solar cells, supercapacitors, batteries, sensors, etc., the book illustrates how the chemical deposition route is emerging as a relatively inexpensive, simple, and convenient solution for large area deposition. The advancement in the nanostructured materials for the development of devices is fully discussed.