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Author: Publisher: ISBN: Category : Languages : en Pages : 50
Book Description
This document details a study of the fundamental physical and chemical processes occuring in hot filament and laser assisted synthetic diamond CVD processes. The chemical model developed in this program permits a detailed analysis of previous investigations. This model suggests that several factors will limit the attainable purity and utility of synthetic diamonds grown by plasma or hot filament CVD techniques. A diamond deposition process based upon selective laser production of the chemical species which give rise to the films is described. This technique holds the promise of growing essentially pure diamond at rates comparable to existing schemes, and should permit co-deposition of selected dopant species to make novel new optic and electro-optic devices. An experimental diamond CVD reactor has been designed, developed and tested to provide experimental verification of the model. The reactor has been run in two modes of operation; a hot filament CVD mode, and a laser-assisted hot filament mode. Films deposited in the hot filament mode of operation exhibit the physical characteristics and growth behavior expected for synthetic diamond films. The observed growth kinetics agree with predictions based upon the chemical model developed here. A study based upon a laser-assisted hot filament diamond CVD process suggests that the laser process results in an enhancement of the rate of film growth, although the extent of this enhancement was limited by the available laser power. Further investigation using greater laser powers will be required to confirm this result and expand upon the results.
Author: Publisher: ISBN: Category : Languages : en Pages : 50
Book Description
This document details a study of the fundamental physical and chemical processes occuring in hot filament and laser assisted synthetic diamond CVD processes. The chemical model developed in this program permits a detailed analysis of previous investigations. This model suggests that several factors will limit the attainable purity and utility of synthetic diamonds grown by plasma or hot filament CVD techniques. A diamond deposition process based upon selective laser production of the chemical species which give rise to the films is described. This technique holds the promise of growing essentially pure diamond at rates comparable to existing schemes, and should permit co-deposition of selected dopant species to make novel new optic and electro-optic devices. An experimental diamond CVD reactor has been designed, developed and tested to provide experimental verification of the model. The reactor has been run in two modes of operation; a hot filament CVD mode, and a laser-assisted hot filament mode. Films deposited in the hot filament mode of operation exhibit the physical characteristics and growth behavior expected for synthetic diamond films. The observed growth kinetics agree with predictions based upon the chemical model developed here. A study based upon a laser-assisted hot filament diamond CVD process suggests that the laser process results in an enhancement of the rate of film growth, although the extent of this enhancement was limited by the available laser power. Further investigation using greater laser powers will be required to confirm this result and expand upon the results.
Author: Koji Kobashi Publisher: Elsevier ISBN: 0080525571 Category : Science Languages : en Pages : 350
Book Description
Discusses the most advanced techniques for diamond growth Assists diamond researchers in deciding on the most suitable process conditions Inspires readers to devise new CVD (chemical vapor deposition Ever since the early 1980s, and the discovery of the vapour growth methods of diamond film, heteroexpitaxial growth has become one of the most important and heavily discussed topics amongst the diamond research community. Kobashi has documented such discussions with a strong focus on how diamond films can be best utilised as an industrial material, working from the premise that crystal diamond films can be made by chemical vapour disposition. Kobashi provides information on the process and characterization technologies of oriented and heteroepitaxial growth of diamond films.
Author: Jes Asmussen Publisher: CRC Press ISBN: 0824743245 Category : Technology & Engineering Languages : en Pages : 658
Book Description
The Diamond Films Handbook is an important source of information for readers involved in the new diamond film technology, emphasizing synthesis technologies and diamond film applications. Containing over 1600 references, drawings, photographs, micrographs, equations, and tables, and contributions by experts from both industry and academia, it includes specific chapters that address film characterization methods and the physics and chemistry of film synthesis. Other topics include deposition chemistry, various techniques for diamond synthesis, diamond heat spreaders, thermal management diamond active electronic devices, and diamond film optics.
Author: Mark A. Prelas Publisher: Routledge ISBN: 135144249X Category : Science Languages : en Pages : 1232
Book Description
Examines both mined and synthetic diamonds and diamond films. The text offers coverage on the use of diamond as an engineering material, integrating original research on the science, technology and applications of diamond. It discusses the use of chemical vapour deposition grown diamonds in electronics, cutting tools, wear resistant coatings, thermal management, optics and acoustics, as well as in new products.
Author: Robert E. Clausing Publisher: Springer Science & Business Media ISBN: 1468459678 Category : Science Languages : en Pages : 894
Book Description
Diamond films grown by activated chemical vapor deposition have superlative thermal, mechanical, optical, and electronic properties combined with a very high degree of chemical inertness to most environments. These properties, together with the ability to fabricate films and shapes of considerable size, promise an exciting new material with many applications. Some applications are on the verge of commercialization but many await a few more technological developments. Diamond-like films are already employed in both commercial and military applications. The popular press, as well as the scientific and technological and industrial communities, are increasingly interested in the potential for future development of these materials. Although there are many technical papers and review articles published, there is no Single comprehensive introduction to these technologies. The Scientific Affairs Division of NATO recognized the need and the future importance of these technologies and authorized an Advanced Study Institute on diamond and diamond-like films. NATO Advanced Study Institutes are high level teaching activities at which a carefully defined subject is presented in a systematic and coherently structured program. The subject is treated in considerable depth by lecturers eminent in their fields and of international standing. The presentations are made to students who are scientists in the field or who possess an advanced general scientific background.
Author: Ashok Kumar Dua Publisher: Trans Tech Publications Ltd ISBN: 3035706352 Category : Technology & Engineering Languages : en Pages : 110
Book Description
Diamond, as well as being a precious gem, is a versatile material par excellence. No other material comes anywhere near to matching its properties, which are both extreme, and also expressed in rare combinations. However, natural diamonds, and those synthesised under high sandpressure temperatures, are too expensive or small for many technological applications. These limitations can be overcome by using large-area diamond coatings; chemically bonded to inexpensive non-diamond surfaces. The consequent economic advantages provide the driving force for much diamond-related research and technology.
Author: Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
Diamond films with {l angle}110{r angle} and {l angle}100{r angle} textures were analyzed by x-ray diffraction, transmission electron microscopy and scanning electron microscopic examinations of the evolving growth surface topography. Results support the hypothesis that twinning can play an important role in the nucleation and growth of the {l angle}110{r angle} texture. A model similar to that proposed to explain the development of the {l angle}110{r angle} texture in silicon film growth can also explain the development of the {l angle}110{r angle} textures in diamond films. A special near {l angle}100{r angle}'' textured film with {l brace}100{r brace} facets perpendicular to the growth direction is described. This material is free of intra-crystalline stacking faults and twins. Growth mechanisms and texture development are discussed, and it is shown that randomly oriented nuclei grow into films with crystallites oriented so that the fastest growing'' crystallographic direction is normal to the substrate. 11 refs., 5 figs.
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Author: Koji Kobashi
Author: Jes Asmussen
Author: Mark A. Prelas
Author: Teradol Srivinyunon
Author: Robert E. Clausing
Author: Shu Jin
Author: Ashok Kumar Dua
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