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Transient competition between photocatalysis and carrier recombination in TiO2 nanotube film loaded with Au nanoparticles |
Shao Zhu-Feng (邵珠峰)a b, Yang Yan-Qiang (杨延强)a, Liu Shu-Tian (刘树田)a, Wang Qiang (王强)a b |
a Department of Physics, Harbin Institute of Technology, Harbin 150001, China; b Department of Optics and Electronics Science, College of Science, Harbin Institute of Technology at Wei Hai, Weihai 264209, China |
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Abstract Highly ordered TiO2 nanotube array (TNA) films are fabricated by using an anodic oxidation method. Au nanoparticles (NPs) films are decorated onto the top of TNA films with the aid of ion-sputtering and thermal annealing. An enhanced photocatalytic activity under ultraviolet C (UVC, 266 nm) light irradiation is obtained compared with that of the pristine TNA, which is shown by the steady-state photoluminescence (PL) spectra. Furthermore, a distinct blue shift in the nanosecond time-resolved transient photoluminescence (NTRT-PL) spectra is observed. Such a phenomenon could be well explained by considering the competition between the surface photocatalytic process and the recombination of the photo-generated carriers. The enhanced UV photocatalytic activities of the Au-TNA composite are evaluated through photo-degradation of methyl orange (MO) in an aqueous solution with ultraviolet-visible absorption spectrometry. Our current work may provide a simple strategy to synthesize defect-related composite photocatalytic devices.
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Received: 20 December 2013
Revised: 03 March 2014
Accepted manuscript online:
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PACS:
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61.72.Ji
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68.37.Hk
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(Scanning electron microscopy (SEM) (including EBIC))
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81.07.De
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(Nanotubes)
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81.16.Hc
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(Catalytic methods)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11274082) and the Shandong Excellent Young Scientist Research Award Fund Project, China (Grant No. BS2011CL002). |
Corresponding Authors:
Liu Shu-Tian, Wang Qiang
E-mail: stliu@hit.edu.cn;wq19750505@tom.com
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Cite this article:
Shao Zhu-Feng (邵珠峰), Yang Yan-Qiang (杨延强), Liu Shu-Tian (刘树田), Wang Qiang (王强) Transient competition between photocatalysis and carrier recombination in TiO2 nanotube film loaded with Au nanoparticles 2014 Chin. Phys. B 23 096102
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