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上传于:2016-12-20

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188宝金博页面版: application of sculptured thin film technology to metal oxide gas sensors

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内容提示: ABSTRACT KIETHER, WILLIAM JAY. Application of Sculptured Thin Film Technology to Metal Oxide Gas Sensors. (Under the direction of Dr. H. Troy Nagle.) The main goal of this research has been the application of glancing angle deposition (GLAD) techniques to create highly porous sculptured thin films (STF) structures for use as gas sensors. The glancing angle technique utilizes physical vapor depositions at highly oblique (>70?) angles of incidence to form porous film structures. Process conditions incl...

文档格式:PDF | 页数:187 | 浏览次数:33 | 上传日期:2016-12-20 17:29:17 | 文档星级:
ABSTRACT KIETHER, WILLIAM JAY. Application of Sculptured Thin Film Technology to Metal Oxide Gas Sensors. (Under the direction of Dr. H. Troy Nagle.) The main goal of this research has been the application of glancing angle deposition (GLAD) techniques to create highly porous sculptured thin films (STF) structures for use as gas sensors. The glancing angle technique utilizes physical vapor depositions at highly oblique (>70º) angles of incidence to form porous film structures. Process conditions including the deposition rate, rotation speed, and flux angle were investigated to produce pillar and chevron formations. Control of the anatase/rutile percentages in TiO 2 gas sensors is critical for design and development. Thin films were deposited using reactive e-beam evaporation with a titanium source melt at various partial pressures of oxygen and argon. Post deposition anneal studies were conducted in air from 150-900 °C. The combination of reactive evaporation at high oxygen partial pressures and low temperature (150 °C) anneals in air formed films with the highest percentage of anatase. Depositions at lower oxygen partial pressures yielded films with a higher percentage of rutile, which supports the role of oxygen vacancies as nucleation centers for the anatase to rutile transformation. Higher temperature annealing produced rutile films as expected from the thermodynamics of the TiO 2 system. After the formation of anatase STF structures, the films displayed a high degree of temperature stability during subsequent annealing. Anatase structures were still evident even after annealing at 1200 ºC in air.

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