Mobility enhanced photoactivity in sol-gel grown epitaxial anatase TiO2 films |
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Authors: | Jung Hyun Suk Lee Jung-Kun Lee Jaegab Kang Bo Soo Jia Quanxi Nastasi Michael Noh Jun Hong Cho Chin-Moo Yoon Sung Hoon |
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Affiliation: | School of Advanced Materials Engineering, Kookmin University, Jeongneung-dong, Seongbuk-gu, Seoul 136-702, Korea. |
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Abstract: | Epitaxial anatase thin films were grown on single-crystal LaAlO3 substrates by a sol-gel process. The epitaxial relationship between TiO2 and LaAlO3 was found to be [100]TiO2||[100]LaAlO3 and (001)TiO2||(001)LaAlO3 based on X-ray diffraction and a high-resolution transmission electron microscopy. The epitaxial anatase films show significantly improved photocatalytic properties, compared with polycrystalline anatase film on fused silica substrate. The increase in the photocatalytic activity of epitaxial anatase films is explained by enhanced charge carrier mobility, which is traced to the decreased grain boundary density in the epitaxial anatase film. |
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