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Selective Removal of the Outer Shells of Anodic TiO2 Nanotubes

Authors

  • Hui Li,

    1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong
    2. Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
    3. Center for Functional Photonics, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong
    4. USTC-CityU Joint Advanced Research Centre, Suzhou, Jiangsu 215123, China
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  • Jian-Wen Cheng,

    1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong
    2. Center for Functional Photonics, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong
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  • Shiwei Shu,

    1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong
    2. Center for Functional Photonics, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong
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  • Jie Zhang,

    1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong
    2. Center for Functional Photonics, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong
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  • Lingxia Zheng,

    1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong
    2. Center for Functional Photonics, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong
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  • Chun Kwan Tsang,

    1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong
    2. Center for Functional Photonics, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong
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  • Hua Cheng,

    1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong
    2. Center for Functional Photonics, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong
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  • Fengxia Liang,

    1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong
    2. Center for Functional Photonics, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong
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  • Shuit-Tong Lee,

    1. Jiangsu Key Laboratory for Carbon-Based Functional, Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China
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  • Yang Yang Li

    Corresponding author
    1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong
    2. Center for Functional Photonics, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong
    3. USTC-CityU Joint Advanced Research Centre, Suzhou, Jiangsu 215123, China
    • Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong.
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Abstract

original image

A facile electrochemical method to selectively remove the outer walls of anodic TiO2 nanotubes by leaving the as-anodized nanotubes in the same electrolyte and applying an electric field parallel to the anodic film for several minutes is reported. The better-separated single-walled TiO2 nanotubes thus obtained show significantly improved photocatalytic efficiency compared with their non-etched counterparts.

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