2019 Fiscal Year Final Research Report
Study of the structure and behavior of hydrogen on the defects near the surface of single crystal and thin film of TiO2
| Project/Area Number |
17K05052
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Thin film/Surface and interfacial physical properties
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| Research Institution | Tokyo Gakugei University |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | 酸化チタン / チタン / 水素 / 核反応解析法 |
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| Outline of Final Research Achievements |
The titanium dioxide (TiO2) is one of the most widely used photocatalysts.By absorbing the ultraviolet light, it creates electron-hole pairs and generates free raicals, which would cause water decomposition, sterilization and so on.The bandgap narrowing by using hydrogen is one of the promising candidates for the technology to enhance photocatalytic efficiency.
In this research, the interaction between hydrogen and TiO2 (and also Ti) was researched. The incorporation and release properties of hydrogen into the Ti or TiO2 causes production and dissipation of oxygen vacancies, which causes the change in the geometric and electronic structures, and the density of hydrogen at the surface or in the bulk. Some basic knowledges about their temperature and pressure dependences were acquired.
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| Free Research Field |
表面・界面物性
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| Academic Significance and Societal Importance of the Research Achievements |
二酸化チタンは光触媒として機能するが，バンドギャップが広く紫外光が必要であるという欠点がある．可視光での効率を高めるためのバンドギャップ制御を水素によりおこなえる可能性があり，その可能性を探るために欠かせない水素の吸収・放出特性や表面及び内部での水素密度などの測定手法を開発し，基礎的な知見を得た．本研究をさらに進めることにより，水の分解による水素精製や殺菌作用など，これからの新しい生活様式において重要な役割を果たす光触媒の開発へ繋がることが期待される．
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