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Dissertations / Theses on the topic 'FIELD EMISSION OF ELECTRONS'

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Published: 11 September 2023

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1

Kuwahara, M., T. Morino, T. Nakanishi, et al. "Spin-Polarized Electrons Extracted from GaAs Tips using Field Emission." American Institite of Physics, 2007. http://hdl.handle.net/2237/11993.

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2

Sosa, Edward Delarosa. "The Electron Emission Characteristics of Aluminum, Molybdenum and Carbon Nanotubes Studied by Field Emission and Photoemission." Thesis, University of North Texas, 2002. https://digital.library.unt.edu/ark:/67531/metadc3311/.

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The electron emission characteristics of aluminum, molybdenum and carbon nanotubes were studied. The experiments were setup to study the emission behavior as a function of temperature and exposure to oxygen. Changes in the surface work function as a result of thermal annealing were monitored with low energy ultra-violet photoelectron spectroscopy for flat samples while field emission energy distributions were used on tip samples. The change in the field emission from fabricated single tips exposed to oxygen while in operation was measured using simultaneous Fowler-Nordheim plots and electron e
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3

Poa, Chun Hwa Patrick. "Electron field emission from carbons and their emission mechanism." Thesis, University of Surrey, 2002. http://epubs.surrey.ac.uk/842670/.

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This thesis is concerned with the research of the electron field emission properties of carbon based materials. Low emission threshold fields have been observed from both amorphous carbon thin films and carbon nanotubes. The emission mechanism can be subdivided into two groups depending on the type of electric field enhancement. These are the amorphous carbon flat films with non-geometric field enhancement and carbon nanotubes with high surface geometric field enhancement. Amorphous carbon thin films are deposited using an rf-plasma enhanced chemical vapour deposition technique. Changing the d
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4

Collins, Clare Melissa. "Ordered nanomaterials for electron field emission." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/270357.

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In the quest for reliable, repeatable and stable field electron emission that has commercial potential, whilst many attempts have been made, none yet has been truly distinguishable as being successful. Whilst I do not claim within this thesis to have uncovered the secret to success, fundamental issues have been addressed that concern the future directions towards achieving its full potential. An exhaustive comparison is made across the diverse range of materials that have, over the past 40-50 years, been postulated and indeed tested as field emitters. This has not previously been attempted. Th
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5

Kuhnen, Raphael [Verfasser], and Bernd von [Akademischer Betreuer] Issendorf. "Electron wave packet interference and directed emission of electrons in a two color laser field = Elektronenwellenpacketinterferenz und gerichtete Emission von Elektronen in einem zweifarben Laserfeld." Freiburg : Universität, 2012. http://d-nb.info/1123467781/34.

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6

Laou, Philips. "Field emission devices on silicon." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0001/NQ44486.pdf.

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7

Tsang, Wei Mong. "Electron field emission properties from nanoengineered structures." Thesis, University of Surrey, 2006. http://epubs.surrey.ac.uk/844374/.

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This work is mainly divided into three parts. Firstly, with the aim of integrating electron field emitter with other circuit elements on a single chip, silver-silicon dioxide (Ag-SiO2) nanocomposites are fabricated and studied. The Ag-SiO2 nanocomposites are synthesised by Ag implantation into thermally oxidised SiO2 layers on Si substrates and their fabrication processes are fully compatible with existing integrated circuit technology and their threshold fields are less than 20 V/mum. The local field enhancement mechanisms were studied and the fabrication processes of these layers optimised.
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8

Tang, Yew Fei. "Electron field emission from laser crystallised amorphous silicon." Thesis, University of Surrey, 2003. http://epubs.surrey.ac.uk/843179/.

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Flat panel displays based on electron field emission can provide the benefits of the high resolution of a cathode ray tube display while possessing the portability of a liquid crystal display. To date, the problem with a field emission flat panel display based on silicon is that it usually involves complex photolithography processing, making it too complex and expensive to be commercially viable. In this thesis, the emphasis of the research is to fabricate a three terminal silicon device for flat panel display based on field emission technology without using photolithography processes. Laser c
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9

Smith, Richard Charles. "Electron field emission properties of tip based emitters." Thesis, University of Surrey, 2005. http://epubs.surrey.ac.uk/843091/.

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Large area displays such as laptop computers and flat screen televisions have enormous market potential. There are numerous technologies in existence today, including LCD (liquid crystal displays) and plasma, however they each suffer from unique limitations, mainly the size of the display and operating conditions. There is still a need for a method of depositing electronic materials over large areas at suitable temperatures. This is important since the construction of panels using sub-modules such as crystalline silicon wafers is very difficult and expensive. The displays based on liquid cryst
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10

Forrest, Roy Duncan. "Electron field emission from amorphous semiconductor thin films." Thesis, University of Surrey, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.484237.

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11

Ptitsin, V. E. "New Thermal Field Electron Emission Energy Conversion Method." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35247.

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New thermal field electron emission energy conversion method for vacuum electron-optical systems (EOS) with a nanostructured surface electron sources is offered and developed. Physical and numerical modeling of an electron emission and transport processes for different EOS is carried out. It is shown that at the specific configuration of electrostatic and magnetic fields in the EOS offered method permits to realize energy conversion processes with high efficiency. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35247
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12

Parmee, Richard. "X-ray generation by field emission." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/284924.

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Since the discovery of X-rays over a century ago the techniques applied to the engineering of X-ray sources have remained relatively unchanged. From the inception of thermionic electron sources, which, due to simplicity of fabrication, remain central to almost all X-ray applications at this time, there have been few fundamental technological advances. The emergence of new materials and manufacturing techniques has created an opportunity to replace the traditional thermionic devices with those that incorporate Field Emission electron sources. One of the most important attributes of Field Emissi
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13

Tirolli, Marcelo Nogueira. "Modelamento computacional de ponteiras de emissão de campo." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259568.

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Orientador: Marco Antonio Robert Alves<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-09T17:44:13Z (GMT). No. of bitstreams: 1 Tirolli_MarceloNogueira_M.pdf: 2758197 bytes, checksum: 08f6e633be3e083c0e72c41959dd296d (MD5) Previous issue date: 2007<br>Resumo: Este trabalho tem como objetivo o estudo do comportamento elétrico de uma ponteira de emissão de campo, modelada na forma de um hemisfério sobre um poste, através de recursos computacionais (simulações). Escolhemos o software comercial
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14

Sanchez, Jaime A. "ELECTRON FIELD-EMISSION FROM CARBON NANOTUBES FOR NANOMACHINING APPLICATIONS." UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_diss/590.

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The ability to pattern in the nanoscale to drill holes, to draw lines, to make circles, or more complicated shapes that span a few atoms in width is the main driver behind current efforts in the rapidly growing area of nanomanufacturing. In applications ranging from the microprocessor industry to biomedical science, there is a constant need to develop new tools and processes that enable the shrinking of devices. For this and more applications, nanomanufacturing using electron beams offers a window of opportunity as a top-down approach since electrons, unlike light, have a wavelength that is in
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15

Wang, Tong. "Enhanced Field Emission Studies on Nioboim Surfaces Relevant to High Field Superconducting Radio-Frequency Devices." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/29284.

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Enhanced field emission (EFE) presents the main impediment to higher acceleration gradients in superconducting niobium (Nb) radiofrequency cavities for particle accelerators. The strength, number and sources of EFE sites strongly depend on surface preparation and handling. The main objective of this thesis project is to systematically investigate the sources of EFE from Nb, to evaluate the best available surface preparation techniques with respect to resulting field emission, and to establish an optimized process to minimize or eliminate EFE. To achieve these goals, a scanning field emission
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16

Archer, Anthony D. "Spectroscopic studies of field-induced electron emission from isolated microstructures." Thesis, Aston University, 1992. http://publications.aston.ac.uk/8241/.

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A detailed investigation has been undertaken into the field induced electron emission (FIEE) mechanism that occurs at microscopically localised `sites' on uncoated and dielectric coated metallic electrodes. These processes have been investigated using two dedicated experimental systems that were developed for this study. The first is a novel combined photo/field emission microscope, which employs a UV source to stimulate photo-electrons from the sample surface in order to generate a topographical image. This system utilises an electrostatic lens column to provide identical optical properties u
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17

Andrew), Patterson Alex A. (Alex. "Theory and modeling of field electron emission from low-dimensional electron systems." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/115640.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 253-271).<br>While experimentalists have succeeded in fabricating nanoscale field electron emitters in a variety of geometries and materials for use as electron sources in vacuum nanoelectronic devices, theory and modeling of
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18

Day, Christopher M. "Field enhanced thermionic emission from oxide coated carbon nanotubes." Virtual Press, 2006. http://liblink.bsu.edu/uhtbin/catkey/1348860.

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A cathode structure was demonstrated that utilizes aligned carbon nanotubes (CNTs) to improve the thermionic electron emission by increasing the field enhancement of the cathode surface. Aligned CNTs were grown on the surface of a tungsten substrate by plasma enhanced chemical vapor deposition. The tungsten-CNT structure was further coated with a thin film of low work function emissive materials by magnetron sputtering. Numerous cathodes with varying CNT morphology and oxide layer thickness were created. The field and thermionic emission of the cathodes were tested in order to study the effect
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19

Sanborn, Graham Patrick. "A thin film triode type carbon nanotube field electron emission cathode." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50302.

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The current technological age is embodied by a constant push for increased performance and efficiency of electronic devices. This push is particularly observable for technologies that comprise free electron sources, which are used in various technologies including electronic displays, x-ray sources, telecommunication equipment, and spacecraft propulsion. Performance of these systems can be increased by reducing weight and power consumption, but is often limited by a bulky electron source with a high energy demand. Carbon nanotubes (CNTs) show favorable properties for field electron emission (
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20

Andrew), Patterson Alex A. (Alex. "An analytical framework for field electron emission, incorporating quantum- confinement effects." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/84863.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 141-151).<br>As field electron emitters shrink to nanoscale dimensions, the effects of quantum confinement of the electron supply and electric field enhancement at the emitter tip play a significant role in determining the emitted current density (ECD). Consequently, the Fowler-Nordheim (FN) equation, which primarily applies to field emission from the planar surface of a bulk metal may not be val
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21

Xu, Ningsheng. "Field induced hot electron emission from composite metal-insulator-metal microstructures." Thesis, Aston University, 1986. http://publications.aston.ac.uk/8048/.

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22

Little, Scott A. "Experimental and numerical studies of a new thermionic emitter structure based on oxide coated carbon nanotubes operating at large emission currents." Virtual Press, 2007. http://liblink.bsu.edu/uhtbin/catkey/1380104.

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We have developed a thermionic cathode capable of high emission currents. The structure of this cathode is oxide coated carbon nanotubes (CNTs) on a tungsten (W) substrate. This cathode was superior in emission due to the combination of the field enhancement effect from the CNTs and the lowered work function from the semiconducting oxide surface. Such oxide coated CNTs were excellent electron emitters. Conventional electron emission theories, such as Richardson's and Fowler-Nordheim's, did not accurately describe the field enhanced thermionic emission from such emitters. A unified electron emi
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23

Carr, Christopher G. "Space charge-limited emission studies using Coulomb's Law." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FCarr.pdf.

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24

Walton, Jonathan Seabrooke. "Analysis of surface treated chemical vapour deposited diamond for field electron emission." Thesis, Heriot-Watt University, 2000. http://hdl.handle.net/10399/520.

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25

Kudjoe, John. "Design and development of field emission electron columns with variable beam energy." Thesis, University of York, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259834.

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26

Che, Yulu. "Ambipolar Ballistic Electron Emission Microscopy Studies of Gate-field Modified Schottky Barriers." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1282070943.

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27

Pasquetto, Mariana Pinheiro. "Estudo do fenomeno de emissão de eletrons por campo eletrico em nanotubos de carbono." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259945.

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Orientador: Vitor Baranauskas<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-12T17:45:44Z (GMT). No. of bitstreams: 1 Pasquetto_MarianaPinheiro_M.pdf: 2160996 bytes, checksum: c7df63c9eb3cc77d7d929e04f7b71d01 (MD5) Previous issue date: 2008<br>Resumo: Materiais emissores de elétrons são extremamente importantes no ramo da micro e nano eletrônica, como por exemplo, em displays, microscópios eletrônicos, sensores de pressão. Para essas aplicações, podem ser usados catodos frios, ou seja, mat
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28

Neuerman, Robert A. "Simulation and design methods for free-electron laser systems." Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Dec/09Dec%5FNeuerman.pdf.

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Thesis (M.S. in Applied Physics)--Naval Postgraduate School, December 2009.<br>Thesis Advisor(s): Colson, William B. ; Blau, Joseph. "December 2009." Description based on title screen as viewed on January 28, 2010. Author(s) subject terms: Free-electron lasers, FEL simulations, undulators, FEL oscillators, FEL amplifiers, diamond field-emitter arrays, field emission cathodes, cathode test cell. Includes bibliographical references (p. 45). Also available in print.
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29

Seelaboyina, Raghunandan. "Robust and High Current Cold Electron Source Based on Carbon Nanotube Field Emitters and Electron Multiplier Microchannel Plate." FIU Digital Commons, 2007. http://digitalcommons.fiu.edu/etd/217.

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The aim of this research was to demonstrate a high current and stable field emission (FE) source based on carbon nanotubes (CNTs) and electron multiplier microchannel plate (MCP) and design efficient field emitters. In recent years various CNT based FE devices have been demonstrated including field emission displays, x-ray source and many more. However to use CNTs as source in high powered microwave (HPM) devices higher and stable current in the range of few milli-amperes to amperes is required. To achieve such high current we developed a novel technique of introducing a MCP between CNT cathod
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30

Knoop, Ludvig de. "Development of quantitative in situ transmission electron microscopy for nanoindentation and cold-field emission." Toulouse 3, 2014. http://thesesups.ups-tlse.fr/3041/.

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Cette thèse porte sur le développement d'analyse quantitative d'expérience in situ de microscopie électronique en transmission (MET). Nous avons utilisé un porte objet spécial, qui combine les fonctions de polarisation électrique locale et tests de micro-mécanique. La méthode des éléments finis (MEF) a été mise en œuvre afin de comparer les résultats issus de la modélisation avec les résultats expérimentaux. En plus des techniques d'imagerie classique, l'holographie électronique a été employée pour mesurer des champs électriques et de déformation. La première partie traite de l'émission de cha
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31

Chen, Li. "Fabrication of electron sources for a miniature scanning electron microscope." Thesis, University of York, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313904.

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32

Singh, Gopal [Verfasser]. "Development and characterization of a LaB6 based high brightness field emission electron source / Gopal Singh." Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2020. http://nbn-resolving.de/urn:nbn:de:gbv:18-ediss-88773.

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33

Christy, Larry A. "Field Emission Properties of Carbon Nanotube Fibers and Sheets for a High Current Electron Source." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1406819279.

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34

Lagotzky, Stefan, Roman Barday, Andreas Jankowiak, et al. "Prevention of electron field emission from molybdenum substrates for photocathodes by the native oxide layer." Cambridge University Press, 2015. https://tud.qucosa.de/id/qucosa%3A39022.

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Comprehensive investigations of the electron field emission (FE) properties of annealed single crystal and polycrystalline molybdenum plugs, which are used as substrates for actual alkali-based photocathodes were performed with a FE scanning microscope. Well-polished and dry-ice cleaned Mo samples with native oxide did not show parasitic FE up to a field level of 50 MV/m required for photoinjector cavities. In situ heat treatments (HT) above 400°C, which are usual before photocathode deposition, activated field emission at lower field strength. Oxygen loading into the Mo surface, however, part
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35

West, Ryan Matthew. "Work function fluctuation analysis of polyaniline films." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47586.

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In this thesis, the development of a novel experimental technique for measuring the spontaneous, stochastic work function (WF) fluctuations of conducting polymer films, at equilibrium, is discussed. Polyaniline (PANI) is studied as a representative conducting polymer. This technique utilizes an insulated-gate field-effect transistor (IGFET) with PANI gate electrode (PANI-IGFET). The fluctuations of PANI WF are transduced into measurable drain current fluctuations of the device. By analyzing these fluctuations while systematically controlling the temperature, electric field and doping level, a
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36

Neupane, Suman. "Synthesis and Electron Emission Properties of Aligned Carbon Nanotube Arrays." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1168.

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Carbon nanotubes (CNTs) have become one of the most interesting allotropes of carbon due to their intriguing mechanical, electrical, thermal and optical properties. The synthesis and electron emission properties of CNT arrays have been investigated in this work. Vertically aligned CNTs of different densities were synthesized on copper substrate with catalyst dots patterned by nanosphere lithography. The CNTs synthesized with catalyst dots patterned by spheres of 500 nm diameter exhibited the best electron emission properties with the lowest turn-on/threshold electric fields and the highest fie
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37

Liška, Ivo. "Coulomb Interactions in Electron Beams in the Vicinity of a Schottky and Cold Field Emission Sources." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-233896.

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Dizertační práce se zabývá problematikou výpočtu vlivu coulombovských interakcí částic na parametry emitovaného elektronového svazku v blízkosti Schottkyho a studené katody. Práce poskytuje základní předhled o problematice, popisuje vytvořené modely emisních zdrojů a metodu simulace Monte Carlo. Představuje novou metodu generování vstupních dat, která klade větší důraz na přesnou simulaci emisního procesu. Pozornost je zde věnována zejména vlivu interakcí na energiovou šířku, velikost virtuálního zdroje a jas katody v závislosti na velikosti poloměru hrotu a emisním proudu. Sledováním vývoje e
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38

Hii, King-Fu. "A PRECISION INSTRUMENT FOR RESEARCH INTO NANOLITHOGRAPHIC TECHNIQUES USING FIELD-EMITTED ELECTRON BEAMS." UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_diss/675.

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Nanomanufacturing is an active research area in academia and industry due to the ever-growing demands for precision surface modifications of thin films or substrates with nanoscale features. Conventional lithographic techniques face many challenges as they approach their fundamental limits. Consequently, new nanomanufacturing tools, fabrication techniques, and precision instruments are being explored and developed to meet these challenges. It has been hypothesized that direct-write nanolithography might be achieved by using a field-emitted electron beam for nanomachining. This dissertation mov
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39

Takamura, S., S. Mizoshita, and N. Ohno. "Suppression of secondary electron emission from the material surfaces with grazing incident magnetic field in the plasma." American Institute of Physics, 1996. http://hdl.handle.net/2237/6993.

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40

"Field emission properties of a silicon tip array." 2001. http://library.cuhk.edu.hk/record=b5890592.

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Fung Yun Ming.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2001.<br>Includes bibliographical references (leaves 134-140).<br>Abstracts in English and Chinese.<br>Abstract --- p.I<br>Acknowledgement --- p.III<br>Contents --- p.IV<br>List of Figure captions --- p.VIII<br>List of Table captions --- p.XIII<br>Chapter Chapter 1 --- Introduction --- p.1<br>Chapter Chapter 2 --- Theory and Applications<br>Chapter 2.1 --- Principle of field emission<br>Chapter 2.1.1 --- The Fowler-Nordheim Theory --- p.3<br>Chapter 2.1.2 --- Field emission from metals --- p.6<br>Chapter 2.1.3 --- Fie
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41

Hilbert, Shawn A. "Pulse propagation of sound, light, and electrons." 2009. http://proquest.umi.com/pqdweb?did=1694329141&sid=3&Fmt=2&clientId=14215&RQT=309&VName=PQD.

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Thesis (Ph.D.)--University of Nebraska-Lincoln, 2009.<br>Title from title screen (site viewed June 26, 2009). PDF text: xiii, 178 p. : ill. ; 10 Mb. UMI publication number: AAT 3350448 . Includes bibliographical references. Also available in microfilm and microfiche formats.
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42

"A study of field emission properties of ion beam synthesized and modified SiC layers on Si." 2002. http://library.cuhk.edu.hk/record=b5891293.

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Tsang Wei Mong.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2002.<br>Includes bibliographical references (leaves 86-93).<br>Abstracts in English and Chinese.<br>Abstract --- p.i<br>Acknowledgement --- p.iv<br>Contents --- p.v<br>List of Figure Captions --- p.vi<br>List of Table Captions --- p.vii<br>Chapter Chapter 1 --- Introduction<br>Chapter 1.1 --- Introduction --- p.1<br>Chapter 1.2 --- Theory of Electron Field Emission --- p.1<br>Chapter 1.2.1 --- Fowler Nordheim Planar Field Emission Model for Metal --- p.2<br>Chapter 1.3 --- Goal of this Project --- p.9<br>Chapter Ch
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43

SHARMA, ANAND. "FIELD EMISSION OF ELECTRONS FROM HEMISPHERICAL CONDUCTING CARBON NANOTUBE TIP INCLUDING THE EFFECT OF IMAGE FORCE." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14632.

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ABSTRACT The present work examines the field emission from Conducting Hemispherical Carbon Nanotune (CNT) tip including the Effect of Image Force. An expression for electrostatic potential for a Hemispherical CNT tip at a distance from the centre of CNT has been derived. Using the time-independent Schrodinger equation corresponding expressions for transmission coefficient and field emission current density have been derived for the Hemispherical Conducting Carbon Nanotubes. The numerical calculations of potential, transmission coefficient and the current density function have been calculated
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44

Chen, Yi Wen Wang Ben. "Nanotube and nanofiber buckypaper cold cathode illumination experimental investigation /." 2006. http://etd.lib.fsu.edu/theses/available/etd-07102006-161808.

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Thesis (M.S.)--Florida State University, 2006.<br>Advisor: Ben Wang, Florida State University, College of Engineering, Dept. of Industrial Engineering. Title and description from dissertation home page (viewed Sept. 22, 2006). Document formatted into pages; contains xii, 93 pages. Includes bibliographical references.
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45

Liao, Po-Hsinag, and 廖柏翔. "Development of Field Emission Electron Gun for Desktop Electron Microscope." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/3d5ybg.

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碩士<br>國立清華大學<br>工程與系統科學系<br>106<br>With the development of technology, electron microscope has become an important observational tool in different major such as physics, chemistry, biology, and materials engineering. The source of electron microscope, it usually divide into two types, thermionic type and field emission type. Field emission type electron source usually have smaller tip radius than thermal type, so it can produce smaller electron source. Then, electron beam pass by condenser lens, a small spot size source is formed. Therefore, the brightness of the electron gun is much brighter
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46

Liu, Cheng-Ting, and 劉正霆. "Synthesis of carbon nanocoils for electron field emission application." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/41837239808384967366.

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碩士<br>大同大學<br>電機工程學系(所)<br>105<br>In this thesis we use the thermal chemical vapor deposition system to grow the carbon nanocoils and apply them to field emission devices. Firstly, we use the photolithograpic process to define the arrays of hole patterns. Secondly, we use the plasma etching system to remove the Mo layer and wet etching to remove the SiO2 layer and form the holes on Si substrate. Finally, we grow the carbon nanocoils outo the arrays of Mo/SiO2/Si substrate. We compare the field emission characteristics between the diode and triode structures. The results show that the gate of t
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47

RACHANA. "FIELD EMISSION OF ELECTRONS BY TAKING INTO ACCOUNT THE DISTRIBUTION OF CHARGE ALONG THE LENGTH OF METALLIC CARBON NANOTUBES (CNTS)." Thesis, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/19026.

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An mathematical expression has been derived and analysed for total potential energy V and field emission current density function ϕ of emitted electrons by taking into account the distribution of charge along the length of the carbon nanotubes (CNTs), matching to the representation for the tunnelling coefficient. This tunnelling coefficient is obtained from solving of the time independent Schrödinger’s wave equation. Mathematical calculations for the potential energy V, tunnelling coefficient T and current density function ϕ have been worked out for a distinctive set of the CNTs
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48

Liu, Feng Xiang, and 劉鳳翔. "Processes and Research of Carbon Nanotube Field Emission Electron Source." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/18022103617842045982.

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碩士<br>中華大學<br>電機工程學系碩士班<br>90<br>In this thesis, we research field emission characteristic of Carbon Nanotubes, and fabricate the CNTs cathode. Carbon nanotubes (CNTs) cold cathodes were fabricated to replace the hot cathodes of cathode ray tubes (CRTs), because conventional hot cathode must be heated about 680℃. But now we don’t heat the cathode by using Carbon Nanotubes in this work. We just used a DC bias，then the emitter current was emitted to vacuum. It was compared Arc CNTs’ and CVD CNTs’ field emission characteristic, and used a printer to print the cathode once or twice. Th
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49

Natarajan, Srividya. "A Study of Field Emission Based Microfabricated Devices." Diss., 2008. http://hdl.handle.net/10161/675.

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<p>The primary goals of this study were to demonstrate and fully characterize a microscale ionization source (i.e. micro-ion source) and to determine the validity of impact ionization theory for microscale devices and pressures up to 100 mTorr. The field emission properties of carbon nanotubes (CNTs) along with Micro-Electro-Mechanical Systems (MEMS) design processes were used to achieve these goals. Microwave Plasma-enhanced CVD was used to grow vertically aligned Multi-Walled Carbon Nanotubes (MWNTs) on the microscale devices. A 4-dimensional parametric study focusing on CNT growth parameter
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50

Chen, Chia-Huan, and 陳嘉桓. "Analysis of Field Electron Emission Characteristics of Chemically Modified Carbon Nanotubes." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/06697097125512745040.

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碩士<br>國立臺灣科技大學<br>光電工程研究所<br>97<br>Carbon nanotubes (CNTs) were synthesized on carbon cloth by thermal chemical vapor deposition (TCVD). To enhance the field emission current, catalyst metal at the tip of CNTs was removed by chemical modifications with nitric acid (HNO3). The field emission characteristics of CNTs with various HNO3 immersion time were investigated. As a result, when the HNO3 immersion time was 15 min, the threshold electric field (Eth) has the lowest value of 1.9 V/um. When the immersion time was extended, the Eth increased due to defects at the surface of CNTs. Although the E
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