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Fabrication, Characterization And Application Of Zinc Oxide And Zinc Magnesium Oxide Nanostructures, Abdiel Rivera
Fabrication, Characterization And Application Of Zinc Oxide And Zinc Magnesium Oxide Nanostructures, Abdiel Rivera
Doctoral Dissertations
Zinc oxide is a wide bandgap semiconductor with relatively large exciton energy of 60 meV, and longitudinal optical phonon energy of 72 meV. ZnO can be grown in any nanostructure (nanoribbons, nanowires, nanorods, films, core-shell, among others), under any growth condition (metal-organic chemical vapor deposition (MOCVD), molecular beam epitaxial (MBE), hydrothermal, radio-frequency sputtering, sonochemical, etc) to be implemented in a variety of applications. For instance, by adding Mg to ZnO, the energy band separation increases and shift to a lower wavelength. Using ZnMgO, in the form of vertical nanowires, can improve the resolution of solar-blind UV-detectors. Nevertheless, the sol-solubility of …
Model-Based Medium-Voltage Induction Machine Insulation Material Characterization, Arshiah Yusuf Mirza
Model-Based Medium-Voltage Induction Machine Insulation Material Characterization, Arshiah Yusuf Mirza
Master's Theses
The voltage and frequency handling capability of power converter modules have tremendously increased with the penetration of wide-band-gap (WBG) semiconductor technology in power electronics. However, very little is known about the effect of the high-voltage high-frequency transients exerted by WBG power electronics on insulation materials. This thesis investigates the effect of high-voltage, high-frequency transients on aging and breakdown characteristics of insulation materials. The aim of this research was to analyze this breakdown and develop the behavioral model of the breakdown time when such insulation materials are used in inverter-fed medium-voltage induction machines. As a part of this research, a series …
Characterization Of Graphene Oxide, Harish Kumar
Characterization Of Graphene Oxide, Harish Kumar
Doctoral Dissertations
The conversion of graphite to graphene oxide (GO) is an effective and widely used method for solubilizing and exfoliating graphite. However, the oxidation is not uniform, and wide variations in the degree of oxidation exist between and within batches of GO. In this dissertation, we introduce an approach to both quantify the global degree of oxidation in GO and to separate GO into fractions, each with more uniform extents of oxidation. Using the formation of GO-stabilized oil-in-water emulsions, GO is separated into an emulsion fraction and a water fraction. The results find that the GO sheets that stabilize the emulsion …