| 研究課題/領域番号 |
17K06394
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| 研究機関 | 高知工科大学 |
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研究代表者 |
李 朝陽 高知工科大学, システム工学群, 教授 (50461380)
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| 研究分担者 |
川原村 敏幸 高知工科大学, システム工学群, 准教授 (00512021)
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| 研究期間 (年度) |
2017-04-01 – 2020-03-31
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| キーワード | sensor / ZnO / TiO2 / oxygen vacancies / photoluminescence |
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| 研究実績の概要 |
In order to develop a novel photoluminescence type gas sensor, the high intensity of the visible emission light will be expected from ZnO nanostructure. In the first year, we focused on the fabrication of ZnO nanostructures with good photoluminescence property. The parameters influence on the oxygen vacancies which contribute to the photoluminescence property were investigated.
The well-contrallable ZnO nanostructures fabricated on both transparent conductive oxide substrates( ITO, AZO and GZO), silicon and glass substrates.
The green emission from ZnO nanostructures was achieved by development of a novel multiple annealing method inwhich the oxygen vacancies could be controlled by adjusting the paramenters during the optimized multiple annealing process. The luminance of the green emission could be achieved by controlling the amount of oxygen vacancies from different density and morphology of ZnO nanostructures. In order to improve the stability and the sensitivity of the gas sensor, the pure anatase phase TiO2 films were deposited on obtained ZnO nanostructures, showing a special TiO2-ZnO core-shell structures. The obtained TiO2/ZnO structures showed high thermal stability at 1000degree. The TiO2 coated ZnO nanostructures showed high uniformity and stability. The surface area were increased significantly which can be expected to enhance the sensitivity of gas sensor.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The project is going smoothly as scheduled research plan. As the first year plan, we focused on the fabrication of ZnO nanostructures with high photoluminescence property. ZnO nanostructures with controllable oxygen vacancies were obtained by adjusting the parameters during the multi-annealing process. The mophological controlling of ZnO nanostructures were achieved with coating TiO2 films using a mist CVD method. The results are expected to enhance the sensitivity of gas sensor. In addition, the different substrates for gas sensor application were compared on the both conductive and nonconductive substrates. The low cost substrate will be selected for sensor fabrication in next research step.
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| 今後の研究の推進方策 |
In the coming two years, the research will focus on the optimizing the parameters on fabrication ZnO nanostructures by annealing methods, TiO2 coating techniques by mist CVD methods.
The evaluation of the H2 gas sensing property based on different types of ZnO nanostructures, TiO2 thin film, TiO2/ZnO core shell structures will be carried out. The following properties will be focused on: Gas sensitivity for hydrogen and otherreductive gases, high stability in humidity and high temperatures, and the Response-and recovery time in air.
The mechanism of the hydrogen gas sensitivity influence on the photoluminescence property of the ZnO nanostructures will be revealed.
The new type sensor will be designed and demonstrated.
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| 次年度使用額が生じた理由 |
The Photoluminescence measurement system for gas sensitivity could not be completely set up due to the delay of the heating system design.The PL measurement system will be completely in this year,the remaining budget from last year will used to order the some parts of the gas measuremetn system.
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