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Rozprawy doktorskie na temat „Oxygen vacancy”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Kullgren, Jolla. "Oxygen Vacancy Chemistry in Ceria." Doctoral thesis, Uppsala universitet, Strukturkemi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-167521.

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Cerium(IV) oxide (CeO2), ceria, is an active metal oxide used in solid oxide fuel cells and for the purification of exhaust gases in vehicle emissions control. Behind these technically important applications of ceria lies one overriding feature, namely ceria's exceptional reduction-oxidation properties. These are enabled by the duality of the cerium ion which easily toggles between Ce4+ and Ce3+. Here the cerium 4f electrons and oxygen vacancies (missing oxygen ions in the structure) are key players. In this thesis, the nature of ceria's f electrons and oxygen vacancies are in focus, and exami

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Chen, Haiyan. "Probing Defects and Electronic Processes on Gadolinia-doped Ceria Surfaces Using Electron Stimulated Desorption." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10427.

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Probing Defects and Electronic Processes on Gadolinia-doped Ceria Surfaces Using Electron Stimulated Desorption Haiyan Chen 133 Pages Directed by Professor Thomas M. Orlando Polycrystalline gadolinia-doped ceria (GDC) has been widely investigated as a promising low temperature solid oxide fuel cell (SOFC) electrolyte and as part of composite electrodes. In this thesis, electron stimulated desorption (ESD) has been used to probe the defect related electronic properties of GDC surfaces and the interactions of water and molecular oxygen with these surfaces. In particular, the electron

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Wang, Xiaoshuang. "Multiscale modeling of oxygen and vacancy diffusion in dilute ferritic iron alloys." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A72722.

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Iron-based ferritic alloys are used for a plethora of industrial applications. These alloys contain foreign atoms purposely employed to improve certain properties as well as some unwanted impurities introduced during fabrication. Materials properties are decisively influenced by diffusion processes. Very often diffusion cannot be avoided during fabrication and application. Therefore, many efforts are made to understand the underlying atomic-level mechanisms by both experimental and theoretical investigations. In this thesis work a multiscale modelling approach is used to study oxygen and vacan

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Wang, Xiaoshuang [Verfasser], Jürgen [Gutachter] Faßbender, and Karsten [Gutachter] Albe. "Multiscale modeling of oxygen and vacancy diffusion in dilute ferritic iron alloys / Xiaoshuang Wang ; Gutachter: Jürgen Faßbender, Karsten Albe." Dresden : Technische Universität Dresden, 2020. http://d-nb.info/1227311273/34.

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Lin, Hong-Ying. "Improving the optoelectronic property and photoactivity of nano-structured titanuim dioxide effect of particle size, oxygen vacancy, and nitrogen doping /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 1581 p, 2008. http://proquest.umi.com/pqdweb?did=1609302401&sid=2&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Thesis (Ph.D.)--University of Delaware, 2008.<br>Principal faculty advisors: Chin-Pao Huang, Dept. of Civil and Environmental Engineering, and S. Ismat Shah, Dept. of Materials Science Includes bibliographical references.

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6

Girdauskaite, Egle. "Thermodynamische und kinetische Untersuchungen zum Sauerstoffaustausch in perowskitischen Mischoxiden auf Basis von Ferriten und Cobaltiten." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1195658113234-25483.

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Oxidkeramische Materialien sind zunehmend von praktischem Interesse für neue Technologien, die in Brennstoffzellen, Sensoren und Ionentransport-Membranen Anwendung finden. Einige dieser Oxide mit Perowskitstruktur ABO3 zeigen hohe Ionen- und Elektronenleitung, ausreichende chemische Stabilität sowie thermisch-mechanische Eigenschaften, wie sie für die Anwendung als Sauerstofftransportmembran benötigt werden. Oxidionentransport erfolgt über einen Oxidionen-Leerstellenmechanismus. Die charakteristische Schwierigkeit für die Anwendung solcher Materialien besteht aber darin, dass die gestellten Fo

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7

Iwata, Tatsuya. "Study on Resistive Switching Phenomenon in Metal Oxides for Nonvolatile Memory." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188598.

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8

Peng, Yung-Kang. "Surface mapping of faceted metal oxides by chemical probe-assisted NMR for catalytic applications." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:7b56021f-71fb-437b-8c6b-0569705ef68e.

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Semiconductive metal oxides are of great importance in environmental remediation and electronics because of their ability to generate charge carriers when excited with appropriate energy. The electronic structure, light absorption and charge transport properties have made the transition metal oxides an attractive material as photocatalyst. Recently, facet-engineering by morphology control has been intensively studied as an efficient approach to further enhance their photocatalytic performance. However, various processing steps and post-treatments used in the preparation of facet-engineered par

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9

Nishi, Yusuke. "Nonpolar Resistive Switching Based on Quantized Conductance in Transition Metal Oxides." Kyoto University, 2019. http://hdl.handle.net/2433/242544.

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10

Umeda, Yuji. "Rational design of dielectric oxide materials through first-principles calculations and machine-learning technique." Doctoral thesis, Kyoto University, 2020. http://hdl.handle.net/2433/245844.

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京都大学<br>0048<br>新制・課程博士<br>博士(工学)<br>甲第22159号<br>工博第4663号<br>新制||工||1727(附属図書館)<br>京都大学大学院工学研究科材料工学専攻<br>(主査)教授田中功, 教授中村裕之, 教授邑瀬邦明<br>学位規則第4条第1項該当<br>Doctor of Philosophy (Engineering)<br>Kyoto University<br>DFAM

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11

Shojaee, Kambiz. "Fundamental aspects of ammonia oxidation on cobalt oxide catalysts." Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/13657.

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The current thesis deals with the ammonia oxidation on cobalt oxide catalyst at the molecular level. The catalytic oxidation of ammonia to NO is crucial in the industrial process of nitric acid production. Cobalt oxide catalysts are being used together with platinum gauzes to reduce the production cost and emission of greenhouse gas N2O. However, the fundamentals of ammonia oxidation on cobalt oxides are not known. This thesis aims to provide insights into our fundamental understanding of ammonia oxidation on Co3O4 surfaces. The performance of cobalt oxide catalysts in the oxidation of NH3 str

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12

Lortie, Maxime. "Reverse Water Gas Shift Reaction over Supported Cu-Ni Nanoparticle Catalysts." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31733.

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CuNi nanoparticles were synthesized using a new polyol synthesis method. Three different CuxNi1-x catalysts were synthesized where x = 20, 50 and 80. The nanoparticles were deposited on carbon, C, gamma-alumina, γ-Al2O3, yttria-stabilized zirconia, YSZ, and samariumdoped ceria, SDC. Each set of catalysts was tested using the Reverse Water Gas Shift, RWGS, reaction under atmospheric pressure and at temperatures ranging from 400°C-700°C. The experiments were repeated 3 times to ensure stability and reproducibility. Platinum nanoparticles were also deposited on the same supports and tested for th

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13

Saines, Paul James. "Structural Studies of Lanthanide Double Perovskites." Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/3939.

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This project focuses on the examination of the structures of lanthanide containing double perovskites of the type Ba2LnB'O6-d (Ln = lanthanide or Y3+ and B' = Nb5+, Ta5+, Sb5+ and/or Sn4+) using synchrotron X-ray and neutron powder diffraction. The first part of this project examined the relative stability of R3 rhombohedral and I4/m tetragonal structures as the intermediate phase adopted by the series Ba2LnB'O6 (Ln = lanthanide (III) or Y3+ and B' = Nb5+, Ta5+ or Sb5+). It was found that I4/m tetragonal symmetry was favoured when B' was a transition metal with a small number of d electrons, s

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14

Saines, Paul James. "Structural Studies of Lanthanide Double Perovskites." Faculty of Science. School of Chemistry, 2008. http://hdl.handle.net/2123/3939.

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Doctor of Philosophy(PhD)<br>This project focuses on the examination of the structures of lanthanide containing double perovskites of the type Ba2LnB'O6-d (Ln = lanthanide or Y3+ and B' = Nb5+, Ta5+, Sb5+ and/or Sn4+) using synchrotron X-ray and neutron powder diffraction. The first part of this project examined the relative stability of R3 rhombohedral and I4/m tetragonal structures as the intermediate phase adopted by the series Ba2LnB'O6 (Ln = lanthanide (III) or Y3+ and B' = Nb5+, Ta5+ or Sb5+). It was found that I4/m tetragonal symmetry was favoured when B' was a transition metal with a s

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15

Kang, Yuhong. "Mechanisms, Conditions and Applications of Filament Formation and Rupture in Resistive Memories." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/77593.

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Resistive random access memory (RRAM), based on a two-terminal resistive switching device with a switching element sandwiched between two electrodes, has been an attractive candidate to replace flash memory owing to its simple structure, excellent scaling potential, low power consumption, high switching speed, and good retention and endurance properties. However, due to the current limited understanding of the device mechanism, RRAMs research are still facing several issues and challenges including instability of operation parameters, the relatively high reset current, the limited retention an

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16

Chen, Junbo. "Effect of Defects and Photoexcited Electrons on CO2 Reduction using Supported Single Atom Catalysts." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-theses/1266.

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Excessive CO2 emissions can negatively impact society and our planet. Reduction of CO2 is one potential avenue for its abatement. One of the most significant challenges to reducing CO2 is its extremely stable linear form. Experimentally, Cu/TiO2 has shown promise for CO2 photocatalytic reduction. Dispersed atomic catalysts can achieve high catalytic efficiency on a per atom basis. Active sites also typically having lower coordination number, and therefore may be more reactive. Using density functional theory and experimental techniques, we have investigated the role of surface oxygen vacancies

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17

Ali, Fawad. "Investigation of metal oxides thin films developed by PVD system for perovskite solar cells." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/127139/1/Fawad_Ali_Thesis.pdf.

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This research presents thin film deposition and characterization of metal oxides using industrially viable Physical Vapour Deposition (PVD) techniques. The research examines low temperature processed electron and hole transport metal oxides for high performance and stable perovskite solar cells. The physical, chemical, optical and electronic properties of the films were investigated and their device performance has been evaluated. The performance of the device improved and the materials cost reduced by replacing the expansive organic materials with more stable inorganic metal oxides.

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18

Asplet, William. "Etude des interactions entre les défauts lacunaires et les solutés Y,O, Ti pour mieux comprendre leur rôle dans la formation des nanoparticules d'oxydes dans les aciers ODS." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2056/document.

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Cette thèse est dédiée à l’étude des interactions entre les défauts lacunaires et les solutés (Y, Ti, O) pour mieux comprendre la formation des nanoparticules d’oxyde dans les aciers ODS (Oxide Dispersion Strengthened). Ces aciers sont envisagés comme matériau de structure dans la prochaine génération de réacteurs nucléaires fission et fusion. Leurs bonnes propriétés reposent essentiellement sur une répartition homogène de nanoparticules (YxTiyOz) de très faible taille. Cependant, l’obtention de cette répartition n’est pas encore maitrisée et le mécanisme de formation de ces nanoparticules n’e

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19

Saadi, Lama. "Etude de l'adsorption des molécules simples sur WO3 : application à la détection des gaz." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4346/document.

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L'équipe micro-capteurs de l'IM2NP développe des capteursde gaz dont le principe de détection est basé sur la mesure de la variationde la conductance en présence de gaz. Le matériau utilisé comme élémentsensible est l'oxyde de tungstène (WO3) en couches minces. L'objet de cettethèse est donc d'étudier la surface de WO3 dans sa reconstruction c(2x2),obtenue par clivage selon la direction [001]. Cette étude a été également suivied'une étude des lacunes par des calculs ab initio basés sur la DFT, dans lesdeux approximations LDA et GGA. Ensuite, l'dsorption de molécules de gazsimples (O3, COx, NOx

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20

Er-Rakho, Lahcen. "Oxydes de cuivre a valence mixte : perovskites deficitaires en oxygene." Caen, 1987. http://www.theses.fr/1987CAEN2036.

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Mise en evidence et etude de deux grandes familles de composes dans le systeme la::(2)o::(3)-ao-cuo(a=ca,ba,sr) : la::(2-x)ba::(1-x)cu::(1-x/2)o::(5-x)(ln=la,nd) ou cu est essentiellement au degre d'oxydation 2 et une seconde famille caracterisee par la valence mixte du cuivre, les quantites de cuivre 3 pouvant atteindre dans certains cas 40%. Tous ces oxydes ont en commum leur appartenance a la structure perovskite. Proprietes electriques et magnetiques

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21

Guttman, Jeremy. "Polymer-based Tunnel Diodes Fabricated using Ultra-thin, ALD Deposited, Interfacial Films." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469125487.

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KRIK, Soufiane. "Low-operating temperature chemiresistive gas sensors: Fabrication and DFT calculations." Doctoral thesis, Università degli studi di Ferrara, 2021. http://hdl.handle.net/11392/2488099.

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Despite advantages highlighted by Metal OXides (MOX) based gas sensors, these devices still present drawbacks in their performances (e.g. selectivity, stability and high operating temperature), so further investigations are necessary. Researchers tried to address these problems in several ways, which includes new synthesis methods for innovative materials based on MOX, such as solid solutions, addition of catalysts and doping of MOX by using external atoms or oxygen vacancies. Concerning this last issue, literature presents a lack of studies on how the arrangement and number of oxygen vacancie

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23

SARTORETTI, ENRICO. "Doped ceria nanostructures for the oxidation of pollutants: investigations into the role of defect sites." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2910076.

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Vitoux, Laura. "Etude électrochimique et structurale du système NaxMoO2." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0362/document.

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Ce travail de thèse présente l’étude du diagramme de phase des oxydes lamellaires NaxMoO2dans le cadre de la recherche de nouveaux matériaux. L’identification des transitionsstructurales au cours de l’intercalation et désintercalation électrochimique du sodium dans lesdomaines de composition ½ ≤ x ≤ 1 et ¼ < x ≤ ½ a été faite par électrochimie combinée à ladiffraction des rayons X in situ. Il a été montré que le profil très accidenté de la courbegalvanostatique résulte de multiples réarrangements structuraux au cours du cyclage.Notamment l’existence de nombreuses phases NaxMoO2 particulière

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Huang, Mei-tzu, and 黃眉滋. "Oxygen vacancy dependent magnetism in CeO2 nanoparticles." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/gtgfy7.

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碩士<br>國立臺灣科技大學<br>工程技術研究所<br>99<br>This study investigated the magnetism of CeO2 nanoparticles prepared by thermal decomposition method. At first, it is found that the properties of CeO2 NPs were strongly related to the synthesis parameters. CeO2 NPs prepared by using Octyl ether as solvent have higher degree of oxygen deficiency than that of NPs using Benzyl ether a solvent. The concentration of Ce3+ is 42% of the former and 18% of the latter. Importantly, the former one is paramagnetic while the later one is ferromagnetic at room temperature. Then the CeO2 NPs were undergo different redox tr

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26

Lin, Yu-shiang, and 林裕翔. "The oxygen vacancy and spin polarization of cuprous oxide nanoparticle." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/50981798243992667228.

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碩士<br>國立中央大學<br>物理研究所<br>95<br>In studying the magnetic properties of cuprous oxide nanoparticle. We got a group of M-H curve measurements of cuprous oxide nanoparticle and discovered hysteresis at 1.8 K and 5 K. Then we pressed the cuprous oxide sample to control the interparticle separation, and dicussed the effect of interparticle interaction. The range of compacting density (CD) of particles is from 3 % to 77 % . There are two magnetic components in cuprous oxide nanoparticle system. We infer that one component is surface spin polarization and the other is magnetic characters of Cu2O0.

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Yu, Szu Chun, and 尤思淳. "Threshold Voltage Tuning and Oxygen Vacancy Passivation for Advanced FinFET." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/35ms4m.

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碩士<br>國立清華大學<br>工程與系統科學系<br>103<br>FinFET devices have higher on current and lower leakage current due to better gate control ability compared to the conventional single gate planar FETs. With the scaling of gate length, threshold voltage tuning by channel doping will be an issue. With the scaling of EOT, flat band voltage roll-off caused by oxygen vacancy needs to be solved. There are three parts in this thesis to dicuss the impacts of high-k/metal gate process on device characteristics, which are plasma nitridation, ALD pulse time and ALD growth temperature modulation. In the first part, di

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Karapetrova, Euguenia. "Factors influencing the crystallization, phase and oxygen vacancy concentration in zirconia." Thesis, 1997. http://hdl.handle.net/1957/34055.

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In order to achieve a better understanding of the processes that occur during formation and sintering of zirconia, various chemical and physical techniques were used. Along with Perturbation Angular Correlation spectroscopy, that allowed us to investigate microscopic properties inside the nanometer-size zirconia grains, such techniques as Scanning Electron Microscopy and X-ray diffraction were used for determining the size of particles before and after sintering, and Neutron Activation Analysis was employed for measuring the impurity levels in zirconia powders. By controlling the initial condi

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Lin, Ching-Hsien, and 林京憲. "First-Principle Investigation on Oxygen Vacancy in High-K Dielectric Materials." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/18940294968448298313.

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碩士<br>國立高雄應用科技大學<br>電子工程系<br>97<br>Recently, the thickness of gate oxide made from SiO2 in nano-scale MOSFET has reached a physical limit according to the current leakage. The High-K dielectric materials have been found to be a good solution to the problem. However, there is a tradeoff between the dielectric constant and the energy gap in High-K materials, a larger dielectric constant usually associated with a smaller energy gap. To solve this problem a multilayer structure is adopted, for example a TiO2 grown on HfO2. In this work, an alloy oxide of Hf(1-X)TiXO2 is studied because the propert

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Roh, Bumwook Macdonald Digby D. "Defect properties of anodic oxide films on titanium and impact of oxygen vacancy on oxygen electrode reactions." 2007. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-1878/index.html.

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HSIEH, TSU-HSIU, and 謝祖修. "High Sensitivity NO gas sensor using SnO2 nanofiber by oxygen vacancy engineering." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/43bha3.

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Huang, Cheng-Yen, and 黃丞言. "Studies of Oxygen Vacancy Defects and Magnetism in Co-Doped Cerium Oxide Nanoparticles." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/45604922345335992055.

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Wang, Wen-Chieh, and 王玟捷. "Gigantic Enhancement in Sensing Ability of Nanowire Sensor by Increasing the Oxygen Vacancy Amounts." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/64488472717223223958.

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碩士<br>淡江大學<br>物理學系碩士班<br>101<br>Recently, there are many metal-oxide-based nano materials have been studied, most article indicated that the conductivity of the metal-oxide nano materials due to oxygen vacancies. In this research work, the SnO2-X and SnO2 nanostructures have been used to study the detection ability. The sensing abilities of metal-oxide-based nanosensors will be affected by the oxygen vacancy amounts of nanowire surface. In UV sensing, compared to the sensing abilities of SnO2 schottky contacted devices, the SnO2-X schottky contacted devices improved the sensitivity in differen

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Lin, Ching Hsuan, and 林敬軒. "Threshold Voltage Tuning and Oxygen Vacancy Passivation in FinFET by High-k/Metal Gate Processes." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/4tg64p.

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碩士<br>國立清華大學<br>工程與系統科學系<br>103<br>As device scaling, the leading edge technology is moving to FinFET process. In order to improve the FinFET performance, the thesis focuses on the study of High-k/metal gate process. There are three parts in this work to discuss the effects of High-k/metal gate process on device characteristics. In the first study, Vth tuning by the PMA process after MG-1 gate stack is investigated. The EWF, Vth, and other electrical characteristics are discussed. It is found that there are two mechanisms affecting the work function value during the PMA process. First, Work fu

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Yu, Shen-Wei, and 俞勝為. "Evaluation for Oxygen Vacancy on Co-Ce-Y Composite Oxides and Steam Reforming of Ethanol." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/78827177806809738326.

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碩士<br>國防大學理工學院<br>化學工程碩士班<br>102<br>The effect of accessible oxygen on the steam reforming of ethanol (SRE) over Co3O4-CeO2 and Co3O4-CeO2-Y2O3 catalysts was investigated. Both equal molar ratio of Co3O4-CeO2 catalysts were prepared by hydrothermal co-precipitation (H) and hydrothermal ultrasonic-assisted co-precipitation (UH) methods, and finally the UH method was applied to prepare 2.5, 5, and 10 wt % of yttrium-doped Co3O4-CeO2 catalysts, respectively. All catalysts were characterized through X-ray diffraction (XRD), temperature programmed reduction/temperature programmed oxidation (TPR/TPO

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Jiu-XingHuang and 黃久倖. "Influence of oxygen vacancy reservoirs on resistive switching characteristics of oxide based resistance switching memories." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/33367771155989874222.

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Yu-LungChung and 鍾裕隆. "Influences of oxygen vacancy drifting on resistive switching behaviors in TiOx and TaOx based nonvolatile memories." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/xkcv88.

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博士<br>國立成功大學<br>材料科學及工程學系<br>103<br>This dissertation is devoted to study the influence of oxygen vacancy on resistive switching behaviors in the valence change memories (VCM) and electrochemical metallization (ECM) memories. The VCM and ECM memory devices were prepared with the device structures of Pt/TiOx/Pt/TiOx/Pt and Ag/TaOx/Pt, respectively. The current-voltage (I-V) characteristics including the electroforming, unipolar resistive switching (URS), bipolar resistive switching (BRS) and reset current characters were investigated and understood in terms of the migration of oxygen vacancies

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Chu, Fu Chuan, and 褚福荃. "Tuning oxygen vacancy distributions in High-K dielectric and scaling interfacial layer thickness for 16nm FinFET." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/q8s2eu.

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碩士<br>國立清華大學<br>工程與系統科學系<br>105<br>There are several challenges about gate dielectric thickness scaling in MOSFET, such as increased equivalent oxide thickness(EOT) value due to the growth of interfacial layer(IL)、reliability, and oxygen vacancies induced threshold voltage(Vt) variation. This thesis consists of three parts to discuss the impacts on characteristics of gate stack process of 16 nm FinFET, which are interfacial layer desorption by high temperature annealing to reduce IL thickness and defects、reducing Vt variation by passivaMetal nitrideg oxygen vacancy at interface and reducing EO

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Huang, Chien-Ming, and 黃千鳴. "First Principles Study of the Effect of Oxygen Vacancy and Mechanical Strain on the Photocatalytic Activity of Anatase TiO2." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/95510636079016948999.

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碩士<br>國立臺灣大學<br>材料科學與工程學研究所<br>98<br>This study tried to use First Principles to study the effects of induced oxygen vacancies and mechanical strain on formation energy of oxygen vacancies, electronic density of states, band structure and optic absorption coefficient. Our results showed that in oxygen defective TiO2, the relative sites of vacancies have strong influence on the interaction between vacancies, which leads to totally different electronic and optical properties. For different oxygen vacancy concentration, the tendency of oxygen vacancy configuration differs, and this also makes dif

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McCrate, Joseph Michael. "Characterization of low density oxide surface sites using fluorescent probes." 2013. http://hdl.handle.net/2152/23078.

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Low density surface sites are believed to play an important role in processes occurring on oxide surfaces, including catalysis and particle and film nucleation. However, our understanding of the role and chemical nature of such sites play in these processes is limited by the inability to experimentally detect minority surface sites in many oxide systems. The research performed for this dissertation is focused on developing a surface science technique utilizing fluorescent molecules to titrate specific surface sites on planar fused silica surfaces in an ultra-high vacuum (UHV) environment. High

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Lin, YungHsun, and 林詠勛. "Construction of the Carrier Concentration(Oxygen-Vacancy and Cation-Substitution) Separation Model & Metal Doping Effect on the Carrier Concentration in Conductive Oxides." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/02238829690685739233.

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博士<br>國立中央大學<br>化學工程與材料工程研究所<br>99<br>In this thesis, we would propose a method which can decouple and estimate the oxygen-vacancy concentration and the cation-substitution concentration in an extrinsic metal oxide thin film separately. Also, we further propose how the properties of the dopant affect the cation-substitution reaction and the oxygen-vacancy concentration by observing the annealing ambient effects. In chapter 3, we propose the method which could estimate the oxygen-vacancy concentration and the cation-substitution concentration by measuring the carrier concentration of the thin

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Mtangi, Wilbert. "Electrical characterization of process, annealing and irradiation induced defects in ZnO." Thesis, 2012. http://hdl.handle.net/2263/30356.

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A study of defects in semiconductors is vital as defects tend to influence device operation by modifying their electrical and optoelectronic properties. This influence can at times be desirable in the case of fast switching devices and sometimes undesirable as they may reduce the efficiency of optoelectronic devices. ZnO is a wide bandgap material with a potential for fabricating UV light emitting diodes, lasers and white lighting devices only after the realization of reproducible p-type material. The realization of p-type material is greatly affected by doping asymmetry. The self-compensation

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