Photoelectron Emission from Nitrogen- and Boron-doped Diamond (100) Surfaces PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The nitrogen-doped (N-doped), type Ib, synthetic diamond (100) surface was investigated by means of X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS). Photoelectron emission data from the boron-doped (B-doped) and the N-doped diamond (100) surfaces were compared and permitted the energy band diagrams for these differently terminated surfaces to be drawn. We observed emission from energy levels below the conduction band minimum up to the vacuum level and therefore succeed in evaluating the negative electron affinity (NEA) of the hydrogen-terminated diamond surfaces. Both the hydrogen-terminated N- and B-doped diamond (100) surfaces show NEA values of at least −0.2 and −1.0 eV, respectively, while the hydrogen-free surfaces show positive electron affinity. In contrast to the hydrogen-terminated B-doped (100) surface, UPS measurements on the hydrogen-terminated N-doped (100) surface do not reveal a high intensity NEA peak owing to the strong upward band bending. The high intensity NEA peak of B-doped diamond seems to be due to the downward band bending together with the reduced work function because of hydrogen termination. The work function increases for subsequent hydrogen desorption at higher annealing temperatures with associated loss of NEA. For the N-doped diamond (100) surface the work function behaves similarly but the observation of a NEA peak is absent because of the surface barrier formed by the upward band bending.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The nitrogen-doped (N-doped), type Ib, synthetic diamond (100) surface was investigated by means of X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS). Photoelectron emission data from the boron-doped (B-doped) and the N-doped diamond (100) surfaces were compared and permitted the energy band diagrams for these differently terminated surfaces to be drawn. We observed emission from energy levels below the conduction band minimum up to the vacuum level and therefore succeed in evaluating the negative electron affinity (NEA) of the hydrogen-terminated diamond surfaces. Both the hydrogen-terminated N- and B-doped diamond (100) surfaces show NEA values of at least −0.2 and −1.0 eV, respectively, while the hydrogen-free surfaces show positive electron affinity. In contrast to the hydrogen-terminated B-doped (100) surface, UPS measurements on the hydrogen-terminated N-doped (100) surface do not reveal a high intensity NEA peak owing to the strong upward band bending. The high intensity NEA peak of B-doped diamond seems to be due to the downward band bending together with the reduced work function because of hydrogen termination. The work function increases for subsequent hydrogen desorption at higher annealing temperatures with associated loss of NEA. For the N-doped diamond (100) surface the work function behaves similarly but the observation of a NEA peak is absent because of the surface barrier formed by the upward band bending.
Author: Peter R. Schreiner Publisher: John Wiley & Sons ISBN: 3527343911 Category : Technology & Engineering Languages : en Pages : 373
Book Description
The Chemistry of Diamondoids Comprehensive resource on an important and fascinating compound class, covering synthesis, properties, functionalization, and applications in organic synthesis, materials science, and more The Chemistry of Diamondoids gives a state-of-the-art overview of all aspects of diamondoid chemistry, covering nomenclature, natural occurrence, chemical and physical properties, along with synthesis and functionalization of diamondoids as well as their applications as molecular building blocks in organic synthesis, polymer and materials science, nanotechnology, and medicinal chemistry. The book concludes with a perspective towards future developments in the field, thereby drawing attention to areas open for discovery. Written by experts in the field, The Chemistry of Diamondoids includes information on: Naturally occurring diamondoids, their formation, and the role they play in the petroleum industry and in geosciences, plus man-made approaches to prepare them on large scale Growing diamond from diamondoids via seeding, preparation and properties of diamondoid oligomers and doped diamondoids C–H-bond functionalization, a precondition for their use in many applications, and fine-tuning of diamondoid properties by precise cage substitution reactions With its all-encompassing approach, The Chemistry of Diamondoids is a valuable guide for newcomers and researchers in organic chemistry and materials science interested in modern synthetic methods and organic functional materials.
Author: Cesar Saucedo Publisher: 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.
Author: Oliver A Williams Publisher: 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.
Author: Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
Boron-doped single crystal diamond films were grown homoepitaxially on synthetic (100) Type Ib diamond substrates using microwave plasma assisted chemical vapor deposition. A modification in surface morphology of the film with increasing boron concentration in the plasma has been observed using atomic force microscopy. Use of nitrogen during boron doping has been found to improve the surface morphology and the growth rate of films but it lowers the electrical conductivity of the film. The Raman spectra indicated a zone center optical phonon mode along with a few additional bands at the lower wavenumber regions. The change in the peak profile of the zone center optical phonon mode and its downshift were observed with the increasing boron content in the film. Furthermore, sharpening and upshift of Raman line was observed in the film that was grown in presence of nitrogen along with diborane in process gas.
Author: Srinivasarao Yaragalla Publisher: Elsevier ISBN: 0128132493 Category : Technology & Engineering Languages : en Pages : 402
Book Description
Carbon-Based Nanofillers and Their Rubber Nanocomposites: Carbon Nano-Objects presents their synthetic routes, characterization and structural properties, and the effect of nano fillers on rubber nanocomposites. The synthesis and characterization of all carbon-based fillers is discussed, along with their morphological, thermal, mechanical, dynamic mechanical and rheological properties. In addition, the book covers the theory, modeling and simulation aspects of these nanocomposites, along with various applications. Users will find this a unique contribution to the field of rubber science and technology that is ideal for graduates, post graduates, engineers, research scholars, polymer engineers, polymer technologists, and those in biomedical fields. Reviews rubber nanocomposites, including carbon associated nanomaterials (nanocarbon black, graphite, graphene, carbon nanotubes, fullerenes and diamond) Presents the synthesis and characterization of carbon based nanocomposites Relates the structure of these nanocomposites to their function as rubber additives and their many applications Discusses suitable analytical techniques for the characterization of carbon-based nanocomposites
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Author: Peter R. Schreiner
Author: Cesar Saucedo
Author: Oliver A Williams
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Author: Srinivasarao Yaragalla
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