Author: Christos BandisPublisher:
ISBN:
Category : Diamonds
Languages : en
Pages : 318
Book Description
Electron Emission Properties of Negative Electron Affinity Diamond Surfaces
Author: Christos BandisPublisher:
ISBN:
Category : Diamonds
Languages : en
Pages : 318
Book Description
Electron Emission Properties of Diamond Surfaces
Author: Alexander LaikhtmanSecondary Electron Emission Spectroscopy of Diamond Surfaces
Author: Isay L. KrainskyPublisher:
ISBN:
Category : Auger effect
Languages : en
Pages : 28
Book Description
This report presents the results of the secondary electron emission spectroscopy study of hydrogenated diamond surfaces for single crystals and chemical vapor-deposited polycrystalline films. One-electron calculations of Auger spectra of diamond surfaces having various hydrogen coverages are presented, the major features of the experimental spectra are explained, and a theoretical model for Auger spectra of hydrogenated diamond surfaces is proposed. An energy shift and a change in the line shape of the carbon core-valence-valence (KVV) Auger spectra were observed for diamond surfaces after exposure to an electron beam or by annealing at temperatures higher than 950°C. This change is related to the redistribution of the valence-band local density of states caused by hydrogen desorption from the surface. A strong negative electron affinity (NEA) effect, which appeared as a large, narrow peak in the low-energy portion of the spectrum of the secondary electron energy distribution, was also observed on the diamond surfaces. A fine structure in this peak, which was found for the first time, reflected the energy structure of the bottom of the conduction band. Further, the breakup of the bulk excitons at the surface during secondary electron emission was attributed to one of the features of this structure. The study demonstrated that the NEA type depends on the extent of hydrogen coverage of the diamond surface, changing from the true type for the completely hydrogenated surface to the effective type for the partially hydrogenated surface.
Electron Affinity and Electron Emission from Diamond Surfaces and Metal-diamond Interfaces
Author: Peter Karl BaumannNanodiamond
Author: Oliver A WilliamsPublisher: Royal Society of Chemistry
ISBN: 1849737614
Category : Science
Languages : en
Pages : 553
Book Description
The exceptional mechanical, optical, surface and biocompatibility properties of nanodiamond have gained it much interest. Exhibiting the outstanding bulk properties of diamond at the nanoscale in the form of a film or small particle makes it an inexpensive alternative for many applications. Nanodiamond is the first comprehensive book on the subject. The book reviews the state of the art of nanodiamond films and particles covering the fundamentals of growth, purification and spectroscopy and some of its diverse applications such as MEMS, drug delivery and biomarkers and biosensing. Specific chapters include the theory of nanodiamond, diamond nucleation, low temperature growth, diamond nanowires, electrochemistry of nanodiamond, nanodiamond flexible implants, and cell labelling with nanodiamond particles. Edited by a leading expert in nanodiamonds, this is the perfect resource for those new to, and active in, nanodiamond research and those interested in its applications.
Electron Emission Studies from Natural and Synthetic Diamond Surfaces
Author: Wen-Yen ChangPublisher:
ISBN:
Category : Diamonds, Artificial
Languages : en
Pages : 262
Book Description
Characterization of Electron Emission from Diamond Surfaces for Energy Conversion Devices
Author: Gary WanCharacterization of the Sub-bandgap Photoelectron Emission Mechanism of Diamond Into Vacuum and Water
Author: Cesar SaucedoPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Photoelectron emission from diamond has the potential to enable novel photochemistry through the generation of solvated electrons. Hydrogen-terminated diamond surfaces are of particular interest as they exhibit negative electron affinity, allowing for efficient emission of electrons into water and other environments. Due to diamond's large bandgap, photoelectron emission is typically achieved at short wavelengths (225 nm). To enhance photoemission at longer wavelengths (>225 nm), an understanding of the photophysics of sub-bandgap photoelectron emission is necessary. In this thesis, a commercial x-ray photoelectron spectroscopy system was modified to enable sub-bandgap excitation and collect the energy distribution of sub-bandgap photoemitted electrons in vacuum for hydrogen and oxidized (111) boron-doped diamond. We then investigated the effect of incident photon energy on the magnitude of sub-bandgap electron emission into water. Our findings show surface states playing a significant role in sub-bandgap emission in both media, suggesting two distinct pathways to electron emission. These studies provide new insight into the mechanisms underlying diamond's unique electron emission properties in novel media.
Properties, Growth and Applications of Diamond
Author: A. J. NevesPublisher: IET
ISBN: 9780852967850
Category : Science
Languages : en
Pages : 454
Book Description
Recent breakthroughs in the synthesis of diamond have led to increased availability at lower cost. This has spurred R&D into its characterization and application in machine tools, optical coatings, X-ray windows and light-emitting optoelectronic devices. This book draws together expertise from some 60 researchers in Europe and the USA working on bulk and thin film diamond. All fully refereed, the contributions are combined to form a highly structured volume with reviews, evaluations, tables and illustrative material, together with expert guidance to the literature.
Diamond: Electronic Properties and Applications
Author: Lawrence S. PanPublisher: Springer Science & Business Media
ISBN: 1461522579
Category : Technology & Engineering
Languages : en
Pages : 482
Book Description
The use of diamond for electronic applications is not a new idea. As early as the 1920's diamonds were considered for their use as photoconductive detectors. However limitations in size and control of properties naturally limited the use of diamond to a few specialty applications. With the development of diamond synthesis from the vapor phase has come a more serious interest in developing diamond-based electronic devices. A unique combination of extreme properties makes diamond partiCularly well suited for high speed, high power, and high temperature applications. Vapor phase deposition of diamond allows large area films to be deposited, whose properties can potentially be controlled. Since the process of diamond synthesis was first realized, great progress have been made in understanding the issues important for growing diamond and fabricating electronic devices. The quality of both intrinsic and doped diamond has improved greatly to the point that viable applications are being developed. Our understanding of the properties and limitations has also improved greatly. While a number of excellent references review the general properties of diamond, this volume summarizes the great deal of literature related only to electronic properties and applications of diamond. We concentrate only on diamond; related materials such as diamond-like carbon (DLC) and other wide bandgap semiconductors are not treated here. In the first chapter Profs. C. Y. Fong and B. M. Klein discuss the band structure of single-crystal diamond and its relation to electronic properties.