https://scholars.lib.ntu.edu.tw/handle/123456789/491047
標題: | Photocatalytic behaviors of TiO <inf>2</inf>-SrTiO <inf>3</inf> composite thin film and nanostructure | 作者: | Chen, C.-H. Shieh, J. Lin, C.-S. Shyue, J.-J. CHAO-SUNG LIN |
公開日期: | 2011 | 卷: | 1 | 起(迄)頁: | 33-38 | 來源出版物: | ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2011 | 摘要: | To improve the efficiency of water splitting by photo-catalysis, a semiconductor heterojunction made of titanium dioxide (TiO2) and strontium titanate (SrTiO3) is constructed to promote the separation of photo-induced electron and hole (e-/h+) pairs. The photocatalytic behaviors of the TiO2-SrTiO3 composite film and nanostructure fabricated by the sol-gel and hydrothermal methods are studied. UV-visible and ultraviolet photoelectron spectroscopies (UV-Vis & UPS) are adopted to identify the band structure of the TiO2- SrTiO3 heterojunction. For the composite film system, an approximately 0.5 eV band shift at the heterojunction improves the separation of photo-induced e-/h+ pairs. The photocurrent density of the composite film is about 2-3 times larger than that of the TiO2 or SrTiO3 film alone. For the composite nanostructure system, it is composed of an array of TiO2 nanotubes coated with SrTiO3 nanoparticles. An approximately 0.2 eV band shift at the heterojunction is determined for the composite nanostructure. It is found that the size of the SrTiO3 nanoparticles, which can be controlled by the hydrothermal temperature and time, is a key factor in influencing the photocurrent density of the TiO2-SrTiO3 composite nanostructure. © 2011 by ASME. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/491047 | SDG/關鍵字: | Heterojunctions; Image enhancement; Intelligent materials; Intelligent systems; Magnetic semiconductors; Nanoparticles; Sol-gels; Strontium titanates; Thin films; TiO2 nanoparticles; Titanium dioxide; Ultraviolet photoelectron spectroscopy; Composite nanostructures; Composite thin films; Hydrothermal methods; Hydrothermal temperature; Photocatalytic behaviors; Photocurrent density; Semiconductor heterojunctions; Titanium dioxides (TiO2); Nanocomposite films |
顯示於: | 材料科學與工程學系 |
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