To improve the efficiency of water splitting by photocatalysis, 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 photoinduced 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.
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ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
September 18–21, 2011
Scottsdale, Arizona, USA
Conference Sponsors:
- Aerospace Division
ISBN:
978-0-7918-5471-6
PROCEEDINGS PAPER
Photocatalytic Behaviors of TiO2-SrTiO3 Composite Thin Film and Nanostructure
Chun-Hsien Chen,
Chun-Hsien Chen
National Taiwan University, Taipei, Taiwan
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Jay Shieh,
Jay Shieh
National Taiwan University, Taipei, Taiwan
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Chao-Sung Lin,
Chao-Sung Lin
National Taiwan University, Taipei, Taiwan
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Jing-Jong Shyue
Jing-Jong Shyue
National Taiwan University, Taipei, Taiwan
Search for other works by this author on:
Chun-Hsien Chen
National Taiwan University, Taipei, Taiwan
Jay Shieh
National Taiwan University, Taipei, Taiwan
Chao-Sung Lin
National Taiwan University, Taipei, Taiwan
Jing-Jong Shyue
National Taiwan University, Taipei, Taiwan
Paper No:
SMASIS2011-4956, pp. 33-38; 6 pages
Published Online:
February 7, 2012
Citation
Chen, C, Shieh, J, Lin, C, & Shyue, J. "Photocatalytic Behaviors of TiO2-SrTiO3 Composite Thin Film and Nanostructure." Proceedings of the ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, Volume 1. Scottsdale, Arizona, USA. September 18–21, 2011. pp. 33-38. ASME. https://doi.org/10.1115/SMASIS2011-4956
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