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

    Author(s)
    Zhang, Haimin
    Liu, Porun
    Liu, Xiaolu
    Zhang, Shanqing
    Yao, Xiangdong
    An, Taicheng
    Amal, Rose
    Zhao, Huijun
    Griffith University Author(s)
    Zhao, Huijun
    Zhang, Shanqing
    Liu, Porun
    Year published
    2010
    Metadata
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    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 ...
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    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 àfor 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.
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    Journal Title
    Langmuir
    Volume
    26
    Issue
    13
    DOI
    https://doi.org/10.1021/la1005314
    Copyright Statement
    © 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.
    Subject
    Solid state chemistry
    Other environmental sciences not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/34464
    Collection
    • Journal articles

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