Transient competition between photocatalysis and carrier recombination in TiO2 nanotube film loaded with Au nanoparticles

doi:10.1088/1674-1056/23/9/096102

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.

Keywords: TiO₂ nanotube array film Au nanoparticles oxygen vacancies photocatalytic activity

Received: 20 December 2013
Revised: 03 March 2014
Accepted manuscript online:

PACS:	61.72.Ji
	68.37.Hk	(Scanning electron microscopy (SEM) (including EBIC))
	81.07.De	(Nanotubes)
	81.16.Hc	(Catalytic methods)

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

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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Transient competition between photocatalysis and carrier recombination in TiO2 nanotube film loaded with Au nanoparticles

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Transient competition between photocatalysis and carrier recombination in TiO₂ nanotube film loaded with Au nanoparticles