Fabrication of Highly Ordered TiO2 Nanorod/Nanotube Adjacent Arrays for Photoelectrochemical Applications

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Title Fabrication of Highly Ordered TiO2 Nanorod/Nanotube Adjacent Arrays for Photoelectrochemical Applications
Author Zhang, Haimin; Liu, Porun; Liu, Xiaolu; Zhang, Shanqing; Yao, Xiangdong; An, Taicheng; Amal, Rose; Zhao, Huijun
Journal Name Langmuir
Year Published 2010
Place of publication United States
Publisher American Chemical Society
Abstract This work reports a facile approach to fabricate a perpendicularly aligned and highly ordered TiO2 nanorod/nanotube (NR/NT) adjacent film by directly anodizing a modified titanium foil. The titanium foil substrate was modified with a layer of crystalline TiO2 film via a hydrothermal process in 0.05 M (NH4)2S2O8. The resultant NR/NT architecture consists of a highly ordered nanorod top layer that directly adjoins to a highly ordered nanotube array bottom layer. The thickness of the top nanorod layer was 90 nm with average nanorod diameter of 22 nm after 20 min of anodization. The thickness of the bottom nanotube array layer was found to be ca. 250 nm after 20 min of anodization, having an average outer and inner tubular diameters of 120 and 80 nm, respectively. A broad implication of the method is that a simple modification to the substrate surface can lead to new forms of nanostructures. For as-anodized NR/NT samples, XRD analysis reveals that the nanorods are of anatase TiO2 crystalline form while the nanotubes are amorphous. Anatase TiO2 crystalline form of NR/NT film with high crystallinity can be obtained by thermally treating the as-anodized sample at 450 °C for 2 h in air. The resultant NR/NT film was used as a photoanode for photoactivity evaluation. Comparing with a nanotube array photoanode prepared by direct anodization of unmodified titanium foil, the NR/NT photoanode exhibits a unique feature of selective photocatalytic oxidation toward organics, which makes it very attractive to photocatalytic degradation of organic pollutants, sensing, and other applications.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1021/la1005314
Copyright Statement Copyright 2010 American Chemical Society. Self-archiving of the author-manuscript version is not yet supported by this publisher. Please refer to the journal link for access to the definitive, published version or contact the authors for more information.
Volume 26
Issue Number 13
Page from 11226
Page to 11232
ISSN 0743-7463
Date Accessioned 2010-07-30
Date Available 2010-10-08T06:55:38Z
Language en_AU
Research Centre Environmental Futures Research Institute; Queensland Micro and Nanotechnology Centre
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Environmental Sciences; Environmental Technologies; Solid State Chemistry
URI http://hdl.handle.net/10072/34464
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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