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Dissertations / Theses on the topic 'Metal doping'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Crawford, Kevin G. "Surface transfer doping of diamond using transition metal oxides." Thesis, University of Glasgow, 2017. http://theses.gla.ac.uk/8561/.

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This thesis presents a body of work which advances the use of single crystal hydrogen terminated diamond as a semiconducting material. Surface transfer doping of intrinsic diamond is investigated, examining the current state of this technology and its limitations. New techniques for producing robust, thermally stable surface transfer doped diamond were achieved through use of transition metal oxides such as MoO3 and V2O5, as demonstrated experimentally by way of Hall measurement. Through use of these materials, thermal stability was greatly increased up to temperatures of at least 300oC. To ac

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2

Taub, Samuel. "Transition metal oxide doping of ceria-based solid solutions." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/18845.

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The effects of low concentration Co, Cr and Mn oxide, singly and in combination, on the sintering and electrical properties of Ce0.9Gd0.1O1.95 (CGO) have been investigated with possible mechanisms suggested to explain this modified behaviour. The influence of these dopants on the densification kinetics of CGO were primarily investigated using constant heating rate dilatometry. Whilst low concentration Co and Mn-oxide were found to improve the sinterability of CGO, the addition of Cr-oxide was found to inhibit the densification kinetics of the material. The location and concentration of these d

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3

Fei, Wenwen. "Au25(SR)18: Metal Doping, Ligand Exchange, and Fusion Reactions." Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3424837.

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In the past few years, the interest in the study of atomically precise metal nanoclusters has grown very significantly. Main reasons are the refined techniques nowadays available for controlling their structure and composition, their often-intriguing properties, and the possibility to tailor them for specific applications. This Thesis aims at providing new tools to synthesize, control, modify, and characterize thiolate-protected gold nanoclusters. The focus of the research is on the thiolate-protected Au25(SR)18 cluster, which is considered by many the true benchmark system for the study of at

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4

Trapatseli, Maria. "Doping controlled resistive switching dynamics in transition metal oxide thin films." Thesis, University of Southampton, 2018. https://eprints.soton.ac.uk/423702/.

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Transition metal oxide thin films have attracted increasing attention due to their potential in non-volatile resistive random access memory (RRAM) devices, where such thin films are used as active layers in metal-insulator-metal (MIM) configurations. Titanium dioxide is one of the most celebrated oxides among the ones that exhibit resistive switching behaviour due to its wide band gap, high thermal stability, and high dielectric constant. RRAM devices with various materials as active layers, have demonstrated very fast switching performance but also huge potential for miniaturisation, which is

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5

PRADA, STEFANO. "Enhancing oxide surface reactivity by doping or nano-structuring." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2014. http://hdl.handle.net/10281/50011.

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Wide band-gap simple oxides are rather inert materials, which found applications in heterogeneous catalysis mainly as supports for active metal nanoparticles. This thesis investigates tailored modifications of the oxide characteristics aimed at making these substrates more reactive in catalytic processes. In particular we are interested in engineering the charge transfer with supported metal catalysts in order to enhance their activity and selectivity. By using first principles calculations in the framework of the density functional theory, we have explored two main routes in this field: 1) na

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6

Derk, Alan Richard. "Understanding and Controlling Light Alkane Reactivity on Metal Oxides| Optimization Through Doping." Thesis, University of California, Santa Barbara, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3724768.

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<p> Metal oxide catalysts have numerous industrial applications and have garnered research attention. Although oxides catalyze many important reactions, their yields to products are too low to be of economic value due to low conversion and/or low selectivity. For example, some oxides can catalyze the conversion of methane to intermediates or products that are liquefiable at yields no higher than 30%. With improved yield, such a process could help reduce the trillions of cubic feet of natural gas flared every year, saving billions of dollars and millions of tonnes of greenhouse gases. To this e

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7

Crowley, Kyle McKinley. "Electrical Characterization, Transport, and Doping Effects in Two-Dimensional Transition Metal Oxides." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1597327584506971.

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8

Banerjee, Tanushree. "Impact of Nickel Doping on Hydrogen Storage in Porous Metal-Organic Frameworks." VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/2265.

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A supply of clean, carbon neutral and sustainable energy is the most scientific and technical challenge that humanity is facing in the 21st century. Though there is enough fossil fuels available for a few centuries, their use would increase the level of CO2 in the atmosphere. This would lead to global warming and may pose serious threats such as rising of sea level, change in hydrological cycle, etc. Hence there is a need for an alternative source of fuel that is clean and sustainable. Among the many resources considered as an alternative power source, hydrogen is considered one of the most pr

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9

Buta, Sarah H. (Sarah Hume) 1972. "A first principles investigation of transitional metal doping in lithium battery cathode materials." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9550.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.<br>Includes bibliographical references (p. 77-82).<br>The goal of this work is to understand the properties of mixed-metal intercalation oxides. Using first-principles methods, the effect of doping on the mixing, energetic, and voltage properties as well as the phase diagrams of lithium transition-metal oxides for lithium battery cathode materials was investigated. The effect of doping on the phase separation tendencies of layered transition-metal oxides was examined and it was found that fo

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10

Wang, Junwei. "Chemical doping of metal oxide nanomaterials and characterization of their physical-chemical properties." Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1333829935.

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11

Ola, Oluwafunmilola. "Effect of metal doping and supports on TiO₂-based catalysts for CO₂ photoreduction." Thesis, Heriot-Watt University, 2014. http://hdl.handle.net/10399/2820.

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CO₂ photoreduction into fuels has the potential to reduce future dependence on fossil fuels. This work has examined the effects of metal ion doping on the properties and performance of TiO₂ for CO₂ reduction in different photoreactor configurations. Metal (Pd/Rh, Ni, Cu, V, Cr and Co) doped TiO₂ photcatalysts synthesized by the sol-gel method were suspended or immobilized onto monoliths threaded with optical fibers or quartz plates. Doping with Cu, V and Cr facilitated anatase to rutile phase transformation, while Ni and Co doping inhibited transformation to rutile. All the metal atoms were fo

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12

Jayasinghe, Ashini Shamindra. "Exploring the unique water properties of metal-organic nanotubes." Diss., University of Iowa, 2017. https://ir.uiowa.edu/etd/5521.

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Metal-organic nanotubular (MON) materials have garnered significant attention in the recent years not only due to the aesthetic architecture but also due to the interesting chemical and physical properties that have been reported for these compounds. The number of MONs reported in the literature are limited compared to metal organic frameworks due to synthetic challenges and difficulties in crystal engineering. These types of materials are of interest given their one-dimensional channels that lead to their potential application in advanced membrane technologies. In Forbes group, a uranium-base

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13

Randell, Heather Eve. "Applications of stress from boron doping and other challenges in silicon technology." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0010292.

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14

Zhang, Yimin. "Modulating Metal-Semiconductor Schottky effect with electrostatic doping : Au-InSe as a case study." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS091.

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La thèse examine le comportement et le potentiel de modification des interfaces métal-Séléniure d'Indium (InSe), en se concentrant particulièrement sur la fabrication et la caractérisation de diodes Schottky via un dopage électrostatique. Les expériences ont évalué l'impact de l'utilisation de différents métaux (Au, Ag, Al) comme contacts sur l'InSe, qui restent principalement résistifs et légèrement non linéaires — cela est attribué à la nature non idéale des interfaces, possiblement due à des défauts, des impuretés et des états de lacune induits par le métal. Pour mieux comprendre les compor

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15

Luo, Ming. "Transition-metal ions in II-VI semiconductors ZnSe and ZnTe /." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4630.

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Thesis (Ph. D.)--West Virginia University, 2006.<br>Title from document title page. Document formatted into pages; contains xiv, 141 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 135-141).

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16

Fu, Jie. "Advanced doping techniques and dehydrogenation properties of transition metal-doped LiAlH 4 for fuel cell systems." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-159024.

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Hydrogen is an efficient, carbon-free and safe energy carrier. However, its compact and weight-efficient storage is an ongoing subject for research and development. Among the intensively investigated hydrogen storage materials, lithium aluminum hydride (LiAlH4) is an attractive candidate because of its high theoretical hydrogen density (volumetric: 96.7g H2/l material; gravimetric: 10.6 wt.%-H2) in combination with rather low decomposition temperatures (onset temperature <100°C after doping). Although the reversible dehydrogenation of LiAlH4 must be carried out with the help of organic solv

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17

Khanyile, Sfiso Zwelisha. "Silicon nanowires by metal-assisted chemical etching and its incorporation into hybrid solar cells." University of Western Cape, 2021. http://hdl.handle.net/11394/8340.

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Philosophiae Doctor - PhD<br>The rapid increase in global energy demand in recent decades coupled with the adverse environmental impact of conventional fuels has led to a high demand for alternative energy sources that are sustainable and efficient. Renewable solar energy technologies have received huge attention in recent decades with the aim of producing highly efficient, safe, flexible and robust solar cells to withstand harsh weather conditions. c-Si has been the material of choice in the development of conventional inorganic solar cells owing to it superior properties, abundance and highe

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18

Grüne, Philipp. "Structure and reactivity of metal and semiconductor clusters in the gas phase." Berlin mbv, Mensch-und-Buch-Verl, 2009. http://d-nb.info/995894353/04.

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19

Lee, Edwin Wendell II. "Growth and Nb-doping of MoS2 towards novel 2D/3D heterojunction bipolar transistors." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1480686917234143.

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20

SAVINO, UMBERTO. "Physical properties of metal-oxide surfaces for CO2 valorisation." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2823956.

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21

Meroueh, Laureen. "Effects of doping and microstructural variables on hydrogen generated via aluminum-water reactions enabled by a liquid metal." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/129067.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2020<br>Cataloged from student-submitted PDF of thesis.<br>Includes bibliographical references (pages [110]-127).<br>Hydrogen has the potential to replace fossil fuels in numerous industrial sectors, considering its high energy density, ability to be used within our existing power or heating infrastructure, and lack of CO₂ emissions upon conversion of hydrogen's chemical energy into electricity. However, 96% of hydrogen is currently produced through steam methane reformation, which emits ~12 tons of CO

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22

Nakayama, Ryo. "Exploration into an Innovative Science of Hydrogen Functional Materials Using Low-temperature Ion Beam Irradiation." Kyoto University, 2019. http://hdl.handle.net/2433/236604.

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23

Peleckis, Germanas. "Studies on diluted oxide magnetic semiconductors for spin electronic applications." Access electronically, 2006. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20070821.145447/index.html.

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24

Vinogradov, Nikolay. "Controlling Electronic and Geometrical Structure of Honeycomb-Lattice Materials Supported on Metal Substrates : Graphene and Hexagonal Boron Nitride." Doctoral thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-194089.

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The present thesis is focused on various methods of controlling electronic and geometrical structure of two-dimensional overlayers adsorbed on metal surfaces exemplified by graphene and hexagonal boron nitride (h-BN) grown on transition metal (TM) substrates. Combining synchrotron-radiation-based spectroscopic and various microscopic techniques with in situ sample preparation, we are able to trace the evolution of overlayer electronic and geometrical properties in overlayer/substrate systems, as well as changes of interfacial interaction in the latter.It is shown that hydrogen uptake by graphe

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25

Xing, Shihui. "Rational design of bi-transition metal oxide electrocatalysts for hydrogen and oxygen evolutions." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/209307/1/Shihui_Xing_Thesis.pdf.

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This thesis mainly focuses on the rational design and preparation of bi-transition metal oxide materials for high-performance electrochemical catalysis, such as hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). To address the challenges of sluggish kinetics and large overpotentials in HER and OER, the effective strategy of morphology engineering, introducing a secondary metal element and supporting on carbon-based materials were carried out and discussed.

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26

Almeida, Cristiane Gomes. "Síntese, caracterização e avaliação da atividade fotocatalítica de BiTa(Nb)O4 dopados com cromo e molibdênio na geração de hidrogênio." Instituto de Química, 2013. http://repositorio.ufba.br/ri/handle/ri/16253.

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Submitted by Ana Hilda Fonseca (anahilda@ufba.br) on 2014-10-03T15:33:10Z No. of bitstreams: 1 Dissertação Cristiane.pdf: 9154051 bytes, checksum: aa1fa030f760c514e3fc02dbacb83066 (MD5)<br>Approved for entry into archive by Fatima Cleômenis Botelho Maria (botelho@ufba.br) on 2014-10-03T15:55:32Z (GMT) No. of bitstreams: 1 Dissertação Cristiane.pdf: 9154051 bytes, checksum: aa1fa030f760c514e3fc02dbacb83066 (MD5)<br>Made available in DSpace on 2014-10-03T15:55:32Z (GMT). No. of bitstreams: 1 Dissertação Cristiane.pdf: 9154051 bytes, checksum: aa1fa030f760c514e3fc02dbacb83066 (MD5)<br>Hidrog

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Paniagua, Barrantes Sergio. "Interfacial engineering of transparent electrodes and nanoparticles with phosphonic acids and metal-organic dopants for organic electronic applications." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52920.

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This thesis focuses on understanding the chemistry involved in a variety of surface modification reactions, both on metal oxides and graphene. In this work, the rates of chemisorption of a prototypical phosphonic acid on ITO under several processing protocols are measured using XPS to determine the optimal procedure. UPS is used to track the dependence of the electronic structure of the system, specifically of the work function and position of the valence band maximum on coverage. Phosphonic acid monolayers with appropriate tail groups can also be used to initiate chemistry from surfaces, whic

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28

Brazda, Petr. "Preparation of Fe2O3/SiO2 nanocomposites from molecular precursor by the sol-gel method and the doping of iron (III) by trivalent metal cations." Strasbourg, 2009. http://www.theses.fr/2009STRA6289.

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Les travaux que nous présentons dans cette thèse se concentrent sur la préparation de nanocomposite de silice sol-gel amorphe comme matrice de synthèse de nanocristaux de epsilon-Fe2O3 purs. La souplesse du procédé de synthèse nous a permis d’envisager et de réaliser la substitution partielle et raisonnée du fer par l’aluminium et gallium. Pour cela nous avons élaboré les nanocomposites Al0. 25Fe1. 75O3/SiO2, Al0. 50Fe1. 50O3/SiO2, Al0. 75Fe1. 25O3/SiO2, Ga0. 25Fe1. 75O3/SiO2, Ga0. 50Fe1. 50O3/SiO2 and Ga0. 75Fe1. 25O3/SiO2. Nous avons pu grâce à la maitrise de la synthèse du précurseur et des

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29

Ramamurti, Rahul. "Synthesis of Diamond Thin Films for Applications in High Temperature Electronics." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1145630189.

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30

Elhag, Sami. "Chemically Modified Metal Oxide Nanostructures Electrodes for Sensing and Energy Conversion." Doctoral thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-134275.

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The goal of this thesis is the development of scalable, low cost synthesis of metal oxide nanostructures based electrodes and to correlate the chemical modifications with their energy conversion performance. Methods in energy conversion in this thesis have focused on two aspects; a potentiometric chemical sensor was used to determine the analytical concentration of some components of the analyte solution such as dopamine, glucose and glutamate molecules. The second aspect is to fabricate a photo-electrochemical (PEC) cell. The biocompatibility, excellent electro-catalytic activities and fast e

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31

Li, Xianlong. "Insight into complex systems in heterogeneous catalysis : ab initio study of solid supported metal clusters and the effects of oxygen doping on catalytic activity." Thesis, Queen's University Belfast, 2017. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.727421.

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Both of CO oxidation and water-gas-shift(WGS) reactions in the heterogeneous catalysis were investigated using density functional theory(DFT). Pd/CeO2, Au/TiO2, Pt oxide clusters and Pd were used as the reaction catalysts. For CO oxidation, the L-H, Mv-K mechanisms were determined over these catalysts. For WGS reaction, both of carboxyl and redox pathways were investigated. The clusters and surfaces with global stable structures are predicted by using crystal structure analysis by particle swarm optimization(CALYPSO).

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32

Janzen, Oliver. "Untersuchungen zur Wechselwirkung von Buckminsterfullerenen mit Siliziumoberflächen und zur Dotierung von Metall/Silizium-Grenzflächen mit Buckminsterfullerenen Interaction between Buckminsterfullerenes and Silicon Surfaces and Interface Doping of Metal/Silicon Interfaces with Buckminsterfullerenes." Gerhard-Mercator-Universitaet Duisburg, 2001. http://www.ub.uni-duisburg.de/ETD-db/theses/available/duett-05182001-091725/.

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The present work investigates the interaction between buckminsterfullerene molecules (C60) and silicon surfaces as well as the influence of buckminsterfullerenes on metal/silicon interfaces. The knowledge about the mechanism of surface/molecule interaction between the technologically important semiconductor Si and C60 molecules may lead to new applications of fullerenes. In this context the present study compares the adsorption and the growth mechanisms as well as the desorption of C60 molecules which were evaporated onto well-prepared Si(111)-7x7-, Si(111):H-1x1- and Si(111):Ag-(sqrt(3) x sqr

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Escobar, Diego. "Investigation of ZrNi, ZrMn₂ and Zn(BH₄)₂ Metal/Complex Hydrides for Hydrogen Storage." Scholar Commons, 2007. https://scholarcommons.usf.edu/etd/701.

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The demand for efficient and clean fuel alternatives has been increasing in recent years and is expected to become more pronounced in the future. Utilization of hydrogen as a fuel is one of the most promising energy resources due to its easy production, abundance, regeneration and not creation of greenhouse gases during its combustion. Although gaseous hydrogen has a very high energy content per unit weight, its volumetric energy density is rather low. The large scale use of hydrogen as a fuel crucially depends on the development of compact hydrogen storage materials with a high mass content o

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Krishnan, Bharat. "DEVELOPMENT OF SIMULATION FRAMEWORK FOR THE ANALYSIS OF NON-IDEAL EFFECTS IN DOPING PROFILE MEASUREMENT USING CAPACITANCE ? VOLTAGE TECHNIQUE." MSSTATE, 2005. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04082005-092339/.

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Silicon Carbide devices are proving to be most promising for high power and high-temperature application in recent times. Efficient and accurate characterization of the device characteristics is key to the fabrication of high quality devices and reproduction of the quality of the devices fabricated. Capacitance-Voltage profiling is one of the most commonly used techniques to measure the doping profiles of semiconductors. However, interpretation of C-V profiling in the presence of traps in the material becomes complicated. Various complications arising from compensation between donors and accep

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König, Andreas. "Charge-Density Waves and Collective Dynamics in the Transition-Metal Dichalcogenides: An Electron Energy-Loss Study." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-126887.

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In this thesis, we present a detailed investigation of the electronic properties of particular transition-metal dichalcogenides. Applying electron-energy loss spectroscopy, the connection between the negative plasmon dispersion of tantalum diselenide and the occurrence of a charge-density wave state (CDW) in this compound as well as related materials is observed. Our studies include doping experiments with alkali metal addition altering the charge density of the compounds. This is known to suppress the CDW. We show that it further changes the plasmon dispersion from negative to positive slope.

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Fu, Jie [Verfasser], Bernd [Akademischer Betreuer] Kieback, and Rüdiger [Akademischer Betreuer] Lange. "Advanced doping techniques and dehydrogenation properties of transition metal-doped LiAlH 4 for fuel cell systems / Jie Fu. Gutachter: Bernd Kieback ; Rüdiger Lange. Betreuer: Bernd Kieback." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://d-nb.info/1069092673/34.

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Cabral, Erika Dias. "Estudos de propriedades elétricas e magnéticas em nanoestruturas de GaMnAs de uso em spintrônica." Universidade do Estado do Rio de Janeiro, 2009. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=1462.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Um estudo da interação entre desordem e polarização de spin no GaMnAs ajuda a compreender a natureza dos estados, estendidos ou localizados, bem como as consequências para as transições observadas sobre as propriedades de transporte e às mudanças na ordem magnética de momentos magnéticos localizados em sítios de Mn. Este estudo pressupõe a ocorrência de uma banda impureza com baixas concentrações de Mn, que merge na banda valência no caso de concentrações mais elevada

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Djongkah, Cissillia Young Chemical Sciences &amp Engineering Faculty of Engineering UNSW. "Effect of Pt and Ag metals to the degradation of trichloroethylene, ethylene, ethane, and toluene by gas phase photocatalysis." Awarded by:University of New South Wales. School of Chemical Sciences and Engineering, 2006. http://handle.unsw.edu.au/1959.4/26227.

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The photocatalytic oxidation of trichloroethylene (TCE), ethylene. ethane and toluene on TiO2, Pt/TiO2 and Ag/TiO2 were investigated in a dedicated reactor set-up operated at room temperature and ambient pressure condition. The gas phase experiments were carried out for both single and binary mixtures of these chemicals to identify the role of Pt and Ag metallisation in the photocatalytic oxidation of different contaminants. In a single contaminant system, the presence of Pt enhanced the oxidation of ethylene, ethane and toluene but detrimental to the oxidation of TCE. In the oxidation of ethy

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Simonov, Konstantin. "Effect of Substrate on Bottom-Up Fabrication and Electronic Properties of Graphene Nanoribbons." Doctoral thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-295884.

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Taking into account the technological demand for the controlled preparation of atomically precise graphene nanoribbons (GNRs) with well-defined properties, the present thesis is focused on the investigation of the role of the underlying metal substrate in the process of building GNRs using bottom-up strategy and on the changes in the electronic structure of GNRs induced by the GNR-metal interaction. The combination of surface sensitive synchrotron-radiation-based spectroscopic techniques and scanning tunneling microscopy with in situ sample preparation allowed to trace evolution of the structu

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D'angelo, Anthony Joseph. "Investigation and Synthesis of Novel Graphene-Based Nanocomposites for Hydrogen Storage." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4024.

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It is of great interest to develop and utilize a high surface area material with optimized hydrogen sorption properties. The need for a renewable energy source to replace automobile gasoline has become more critical in the past decade. Hydrogen is a viable fuel source for automobile usage; however, the question of how hydrogen will be safely and efficiently stored still remains. Critical factors for optimum hydrogen storage include ambient conditions and low activation temperature for adsorption and desorption phenomena. In order for optimum hydrogen adsorption to be achieved, the properties o

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Vargas, Hernandez Jesus. "Structural and Morphological modification of TiO2 doped metal ions and investigation of photo-induced charge transfer processes." Thesis, Le Mans, 2017. http://www.theses.fr/2017LEMA1018/document.

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Le travail de thèse porte sur les méthodes de synthèse de nanostructures de dioxyde de titane et de leurs études physicochimiques afin de préciser les corrélations entre la morphologie, le dopage métallique, les caractéristiques structurales avec l'efficacité photocatalytique. Le grand intérêt pour les nanomatériaux TiO2 réside dans la mise au point de nouvelles sources d'énergie ou la conservation de l’environnement par des processus photocatalytiques. Cependant, la limitation principale de TiO2 est du au large gap électronique (eV ~3,2) du polymorphe Anatase. Ainsi, un des objectifs importan

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Xu, Ying. "Fabrication and Characterization of Photodiodes for Silicon Nanowire Applications and Backside Illumination." University of Dayton / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1446313926.

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Ellis, Wade C. "Fundamental Studies and Applications of Ambient Plasma Ionization Sources for Mass Spectrometry." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6484.

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The field of ambient desorption/ionization mass spectrometry (ADI-MS) has existed for over a decade. ADI-MS is a technique that offers benefits including fast analysis time, simple ionization sources that are easily constructed, and little to no required sample preparation. The research presented here describes efforts to better understand plasma-based ADI-MS sources and to explore the use of hydrogen-doped plasma gases with these sources. The use of hydrogen-doped argon (H2/Ar) and hydrogen-doped helium (H2/He) as plasma gases for a dielectric barrier discharge (DBD) and an AC glow dischar

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Silva, Lucas Barboza Sarno da. "Otimização das propriedades de transporte em supercondutores de MgB2 com a adição de compostos de estrutura cristalina tipo AlB2 e fontes distintas de carbono." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/97/97135/tde-08102013-085005/.

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Em Janeiro de 2001, um supercondutor totalmente novo foi apresentado por Nagamatsu, o diboreto de magnésio (MgB2), com uma temperatura crítica, Tc, surpreendentemente alta de 39 K. Atualmente, o MgB2 é considerado o condutor de alto campo do futuro. É claramente aceito que os valores excepcionais de altos campos magnético crítico superior, Hc2, (Hc2 + (0) ? 40 T para Tc ? 35 - 40 K) mostram que o MgB2 é capaz de substituir o Nb3Sn (Hc2 (0) ? 30 T para Tc ? 18 K) como a escolha para aplicações de altos campos magnéticos. Neste trabalho foram preparadas pastilhas supercondutoras de MgB2 utilizan

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Ozouf, Guillaume. "Electrodes à base d’aérogels de SnO2, résistantes à la corrosion pour la réduction de l’oxygène dans les piles à combustible à membrane échangeuse de protons (PEMFC)." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEM060/document.

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Afin d’augmenter la durabilité des PEMFC, des aérogels de dioxyde d'étain ont été étudiés pour remplacer le carbone comme support de catalyseur cathodique. SnO2 est un semi-conducteur de type n dont la conductivité électronique peut être améliorée en le dopant par des cations hypervalents tels que Nb5+, Ta5+ ou Sb5+. Pour être un support de catalyseur efficace, le matériau doit aussi posséder une surface spécifique élevée avec une morphologie mésoporeuse pour permettre à la fois la dispersion et l'activité du catalyseur (Pt). À cette fin, notre objectif était de développer des aérogels de SnO2

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Davis, Taylor Matthew. "Feasibility and Impact of Liquid/Liquid-encased Dopants as Method of Composition Control in Laser Powder Bed Fusion." BYU ScholarsArchive, 2021. https://scholarsarchive.byu.edu/etd/9256.

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Additive manufacturing (AM) – and laser powder bed fusion (LPBF) specifically – constructs geometry that would not be possible using standard manufacturing techniques. This geometric versatility allows integration of multiple components into a single part. While this practice can reduce weight and part count, there are also serious drawbacks. One is that the LPBF process can only build parts with a single material. This limitation generally results in over-designing some areas of the part to compensate for the compromise in material choice. Over-designing can lead to decreased functional effic

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POLO, ANNALISA. "TERNARY OXIDE SEMICONDUCTOR PHOTOANODES FOR SOLAR ENERGY CONVERSION." Doctoral thesis, Università degli Studi di Milano, 2021. http://hdl.handle.net/2434/827287.

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Solar energy conversion and storage into hydrogen is a valuable approach to capture the energy that is freely available from sunlight and to turn it into a clean fuel. Photoelectrochemical (PEC) water splitting through the dual-absorber tandem cell technology has emerged as a promising strategy to this aim. The work conducted in the frame of this PhD thesis aimed at playing a part in the development and optimization of efficient oxide-based semiconductor photoanodes for water oxidation, which is the kinetic bottleneck of the overall PEC water splitting process. Photoanodes based on films of

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Chicot, Gauthier. "Effet de champs dans le diamant dopé au bore." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-01062250.

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Alors que la demande en électronique haute puissance et haute fréquence ne fait qu'augmenter, les semi-conducteurs classiques montrent leurs limites. Des approches basées soit sur des nouvelles architectures ou sur des matériaux à large bande interdite devraient permettre de les dépasser. Le diamant, avec ses propriétés exceptionnelles, semble être le semi-conducteur ultime pour répondre à ces attentes. Néanmoins, il souffre aussi de certaines limitations, en particulier d'une forte énergie d'ionisation du dopant de type p (bore) qui se traduit par une faible concentration de porteurs libres à

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Burnham, Shawn David. "Improved understanding and control of Mg-doped GaN by plasma assisted molecular beam epitaxy." Diss., Available online, Georgia Institute of Technology, 2007, 2007. http://etd.gatech.edu/theses/available/etd-06122007-133821/.

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Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2008.<br>Doolittle, W. Alan, Committee Chair ; Ferguson, Ian T., Committee Member ; Cressler, John D., Committee Member ; Dorsey, John F., Committee Member ; Carter, W. Brent, Committee Member.

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BONDARENKO, VLADIMIR. "The Synthesis and Study of TiO2/Aluminosilicate Composites as Components of Building Finishing Materials for Improvement of the Indoor Air Quality." Doctoral thesis, Università Politecnica delle Marche, 2017. http://hdl.handle.net/11566/251220.

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Lo studio oggetto della tesi presenta il metodo di preparazione di materiali compositi per deposizione chimica di TiO2 su matrici di alluminosilicati per deposizione da una soluzione di Titanio solfato. Materie prime relativamente economiche e facilmente disponibili sono state usate per la preparazione: i frammenti del processo di trattamento meccanico dell'alluminio per l'ottenimento della soluzione di titanio solfato, argille e cenere volante come matrice. L'analisi dei riferimenti di letteratura consente di assumere che questo metodo produca materiali compositi con una larga superfici

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