2017 Fiscal Year Research-status Report
Development of a high sensitive hydrogen gas detector based on the photoluminescence property of ZnO-based nanostructures
| Project/Area Number |
17K06394
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| Research Institution | Kochi University of Technology |
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Principal Investigator |
李 朝陽 高知工科大学, システム工学群, 教授 (50461380)
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| Co-Investigator(Kenkyū-buntansha) |
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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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | sensor / ZnO / TiO2 / oxygen vacancies / photoluminescence |
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| Outline of Annual Research Achievements |
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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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
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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| Strategy for Future Research Activity |
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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| Causes of Carryover |
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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Research Products
(14 results)
