Controlled Synthesis of Anatase TiO2 Single Crystals with Dominant {001} Facets from TiO2 Powders

Authors

  • Hongmei Li,

    1. Institute of Laser and Information Technology, Department of Information Engineering, Shaoyang University, Hunan 42200 (P. R. China)
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  • Prof. Yangsu Zeng,

    1. Institute of Laser and Information Technology, Department of Information Engineering, Shaoyang University, Hunan 42200 (P. R. China)
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  • Prof. Tongcheng Huang,

    1. Institute of Laser and Information Technology, Department of Information Engineering, Shaoyang University, Hunan 42200 (P. R. China)
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  • Prof. Lingyu Piao,

    Corresponding author
    1. National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing 100190 (P. R. China)
    • National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing 100190 (P. R. China)
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  • Dr. Min Liu

    Corresponding author
    1. Institute of Laser and Information Technology, Department of Information Engineering, Shaoyang University, Hunan 42200 (P. R. China)
    • Institute of Laser and Information Technology, Department of Information Engineering, Shaoyang University, Hunan 42200 (P. R. China)
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Abstract

Anatase TiO2 single crystals with dominant {001} facets were fabricated in a controlled manner from TiO2 powders through a facile route for the first time. The obtained TiO2 single crystals have a size of approximately 1.5 μm and a remarkable, roughly 65 % fraction of {001} facets. The influence of the reaction temperature, the amount of precursor, and the reaction time on the morphology and the exposed facets was studied systematically. The percentage of {001} facets increased with the temperature and the amount of precursor, as a result of the surface energy reduction effect of F ions. Further increasing the temperature and the amount of precursor led to serious corrosion of the products because of the enhanced corrosive effect of HF. Owing to the high percentage of exposed {001} facets, the TiO2 single crystals exhibit a much enhanced photocatalytic efficiency (almost fivefold) compared to that of P25 TiO2 as a benchmark material, thus opening a new avenue to prepare highly active TiO2 single crystals with dominant {001} facets from low-cost TiO2 powders.

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