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Nanostructured TiO 2 photocatalyst
and pump-probe spectroscopic study |
| Wen-can ZHOU1,Zheng-cao LI1,Zheng-jun ZHANG1,Ken ONDA2,Sho OGIHARA2,Yoichi OKIMOTO2,Shin-ya KOSHIHARA2, |
| 1.Department of Materials
Science and Engineering, Tsinghua University, Beijing 100084, China; 2.Department of Materials
Science, Tokyo Institute of Technology, Tokyo, Japan; |
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Abstract Titanium dioxide (TiO2), with its large band gap, has attracted much attention due to its excellent photocatalytic activity. TiO2 ball-shaped nano-particles were deposited on silicon substrates by a thermal oxidation approach. With an increase in the annealing temperature the surface morphology and the structure of TiO2 remained stable, exhibiting good heat stability; meanwhile, the hydrogen production rate also increased. The femtosecond pump-probe spectroscopic study showed that the lifetime of carriers of the samples as- deposited and post-annealed at different temperatures were longer than 20 ps.
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| Keywords
TiO2
photocatalysis
pump-probe spectroscopy
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Issue Date: 05 December 2009
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