Please use this identifier to cite or link to this item: http://hdl.handle.net/1783.1/34763

Synthesis and Photoinduced Charge-Transfer Properties of a ZnFe(2)O(4)-Sensitized TiO(2) Nanotube Array Electrode

Authors Li, Xinyong
Hou, Yang
Zhao, Qidong
Chen, Guohua View this author's profile
Issue Date 2011
Source Langmuir , v. 27, (6), March 2011, p. 3113-3120
Summary TiO(2) nanotube arrays sensitized with ZnFe(2)O(4) nanocrystals were successfully fabricated by a two-step process of anodization and a vacuum-assistant impregnation method followed by annealing. The sample was studied by an environmental scanning electron microscope, a transmission electron microscope, energy-dispersive X-ray analysis, and X-ray diffraction to characterize its morphology and chemical composition. Ultraviolet-visible (UV-vis) absorption spectra and a photoelectrochemical measurement approved that the ZnFe(2)O(4) sensitization enhanced the probability of photoinduced charge separation and extended the range of the photoresponse of TiO(2) nanotube arrays from the UV to visible region. In addition, the behaviors of photoinduced charge transfer in a TiO(2) nanotube array electrode before and after sensitization by ZnFe(2)O(4) nanocrystals were comparatively studied. The photoluminescence of the TiO(2) nanotube array electrode became suppressed, and the surface photovoltage responses on the spectrum were significantly enhanced after the introduction of ZnFe(2)O(4) nanocrystals. The transfer dynamics of the photoinduced charges were observed directly by a transient photovoltage measurement, which revealed a fast charge separation at the interface between ZnFe(2)O(4) nanocrystals and TiO(2) nanotubes upon light excitation.
ISSN 0743-7463
Language English
Format Article
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