2 edition of study of field electron emission from composite micro-regimes. found in the catalog.
study of field electron emission from composite micro-regimes.
Marwan Suleiman Mousa
Thesis (PhD) - University of Aston in Birmingham, 1984.
A novel layered transparent Er:CaF 2 composite ceramic was proposed in the present study. Er:CaF 2 nanoparticles were synthesized by a chemical coprecipitation method. The crystal structures and morphologies of synthesized nanoparticles were performed by X‐ray diffraction (XRD) and field emission scanning electron microscope (FE‐SEM) measurements, by: 2. A simple approach is proposed for obtaining low threshold field electron emission from large area diamond-like carbon (DLC) thin films by sandwiching either Ag dots or a thin Ag layer between DLC and nitrogen-containing DLC films. The introduction of silver and nitrogen is found to reduce the threshold field for emission to under 6 V/μm representing a near 46% reduction when compared with Cited by:
Enhancing the electron emission of multiwall carbon nanotubes (MWCNT) is key for applications ranging from cold cathodes used in high-resolution electron microscopes to portable X . The book’s approach covers both theoretical and practical issues related to scanning electron microscopy. The book has 41 chapters, divided into six sections: Instrumentation, Methodology, Biology, Medicine, Material Science, Nanostructured Materials for Electronic Industry, Thin Films, Membranes, Ceramic, Geoscience, and by: 9.
Additive manufacturing (AM) stands for improving yield in industries like medical technology, aerospace or automotive. Inevitably, this trend to develop and improve 3D printing processes has a major impact on the rules of metallurgy and of what is possible when creating metals. New techniques mean new raw materials, alloys and analytical needs. The aim of this article is to provide a systematic evaluation to investigate the characteristics of the field emission properties of graphene–carbon nanotube composites. A model of graphene–carbon nanotube composites is established, and the C–C bond length, binding energy, energy level, ionization potential and .
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A study of field electron emission from composite micro-regimes Author: Mousa, Marwan S. Awarding Body: University of Aston in Birmingham Current Institution: Aston University Date of Award: Availability of Full Text.
A study of field electron emission from composite micro-regimes By Marwan S. Mousa OAI identifier: oai:or: Marwan S. Mousa. Electron Emission in Intense Electric Fields Author(s): R. Fowler and L. Nordheim strong field emission at ordinary temperatures.
The potential energies rounded off by the image effect will be somewhat as shown in fig. (i) (ii) FIG. In order to study the emission through the potential energy step of fig. 1 we have only to solve the. Electron field emission properties of multi-walled carbon nanotubes (MWCNTs)/polyethylene oxide (PEO) thin films composites with (5%, 15%, 25%, 33%, 40% and 50 % loading of MWCNTs) were investigated.
JE curved were measured and modeled according to FowlerNordheim theory. Sample with 33% MWCNTs loading showed the best results with the turn on and threshold fields of V/μm and Author: Nadjima Benkara Mohammed, Roslan Md. Nor, Noureddine Benouattas. A diagnostic study of the field emission characteristics of individual micro-emitters in CVD diamond films field-induced electron emission from 15 mm diameter CVD diamond films deposited centres are associated with composite graphite-diamond micro-regimes.
However, because of the low p Cited by: Electron Field Emission from TiO2 Nanotube Arrays Synthesized by Hydrothermal Reaction Article (PDF Available) in Applied Physics Letters 89(4) July with Reads. Both electrical and field emission measurements were carried out to study the correlation between resistance and field emission performance of individual one-dimensional (1D) ZnO nanostructures.
Three types of 1D ZnO nanostructures were investigated (i.e., agave-like shape, pencil-like shape, and hierarchical structure) and were prepared by thermal chemical vapor transport and condensation. Bamboo bundle fiber cross sections observed by Field Emission Scanning Electron Microscope (FESEM) Fig.
show that under the effect of mechanical rolling and untwining, the basic cellar structure of bamboo was totally smashed. The vascular bundle and parenchymatous ground tissue of bamboo was separated (Yu et al., b).A large amount of microfractures occurred between each fiber.
Introduction. High-quality robust field emitting materials with stable emission over a long period of time are desirable for a wide range of applications such as flat panel displays, vacuum microwave amplifiers, contactless motors, microscopes operated by parallel electron beam sources, etc.
[, ] Different forms of carbon such as diamond, carbon nanotubes, graphene, graphene oxide etc Cited by: 6. where the electric field is represented as F, and the work function is represented as +. Macroscopic electric field strengths required by these cathodes for electron emission exceed 4x10' V/cm.
Spindt-type cathodes require sharp structures for geometrical electric field enhancement to reduce the required applied fields. Birmingham, U.K. Dissertation title: "Energy spectra of field emitted electrons". - Ph.D., University of Aston in Birmingham, Doctorate awardedtitle of thesis: "A study of field electron emission from composite micro-regimes".
Prizes and Awards: "Aston Graduates Association Prize " for "exceptional contribution to the. Field Emission: In this type, a very strong electric field is applied to the metal which pulls the electrons out of the surface due to the attraction of the positive field.
Photoelectric Emission: In this type, the light of a certain frequency is made to fall on the metal surface which leads to the emission of electrons. The FE emission properties of these composite emitters were studied using both conventional field electron microscope (FEM) techniques and high-resolution FE spectroscopy techniques based on the.
Buy Field, Thermionic and Secondary Electron Emission Spectroscopy on FREE SHIPPING on qualified orders Field, Thermionic and Secondary Electron Emission Spectroscopy: A. Modinos: : Books.
Abstract. Influence of fabrication technology on field electron emission properties of nanoporous carbon (NPC) was investigated. Samples of NPC derived from different carbides via chlorination at different temperatures demonstrated similar low-field emission ability with threshold electric field V/ m.
This property correlated with presence of nanopores with characteristic size – nm Cited by: 5. In this study, a homogenously dispersed finer SiC particles‐containing ZrB 2 composite was prepared using nanosized polycarbosilane (PCS) particles‐containing ZrB 2 mixture powder, followed by hot pressing.
The microstructure of the resulting composite was characterized by field‐emission scanning electron microscopy and transmission electron : Shuqi Guo.
- Ph.D., University of Aston in Birmingham, Doctorate awardedtitle of thesis: "A study of field electron emission from composite micro-regimes".
Prizes and Awards: "Aston Graduates Association Prize " for "exceptional contribution to the social and cultural life of the University". It is established that the field-electron emission characteristics of nanodiamond-graphite composite films deposited in nonequilibrium microwave plasma of low-pressure ethanol vapor depend on the deposition regime.
The effect is explained in terms of the cluster model of deposited hydrogenated amorphous carbon (a-C:H) structure. By selecting a deposition regime so as to reduce the content of Cited by: 4. In this study, silica‐coated stearic acid (SA) Nano composite phase change materials were prepared from tetraethyl orthosilicate (TEOS) and stearic acid (SA) via sol‐gel process.
The materials were investigated by Field emission scanning electron microscopy (FE‐SEM), Transmission electron microscope (TEM), Fourier transform infrared Author: Huanmei Yuan, Hao Bai, Yuanyuan Wang.
A composite material of TiO 2 and alum sludge (TiO 2 @AS) is reported in this paper. The samples of alum sludge (AS) and TiO 2 @AS were characterized using a field emission scanning electron microscope (FE-SEM), an energy dispersive spectrometer (EDS) and an Ultima IV X-ray diffractometer (XRD).
In order to study the adsorption capacity and the adsorption mechanism of methylene blue by. The field electron emission is localized on the edges and in the corners of a faceted graphite outgrowth. After alkali metals are adsorbed on the carbon coating, emissions from the flat faces anomalously grows and localizes on graphene-coated faces with alkali atoms present on the surface and under the graphene by: 1.Nano-composite This document was created as part of a Senior Project in the Materials Engineering Department at San Jose State University.
It is intended to provide an introduction scanning electron microscopy and techniques for better imaging. References are provided at the end of the paper for those who wish to study the subject more thoroughly.
A comparative study of the field electron emission from the Si nanotips with apexes of SiC, a-Si and pure Si is carried out, and shows that nanotips with a-Si apexes have not only the highest field enhancement factor but also the best emission uniformity.
The physical origins for the above two improvements in field emission are by: