Vapor-Phase Hydrothermal Transformation of HTiOF3 Intermediates into {001} Faceted Anatase Single-Crystalline Nanosheets

Authors

  • Porun Liu,

    1. Centre for Clean Environment and Energy, Griffith School of Environment, Griffith University, Queensland 4222, Australia
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  • Yun Wang,

    1. Centre for Clean Environment and Energy, Griffith School of Environment, Griffith University, Queensland 4222, Australia
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  • Haimin Zhang,

    1. Centre for Clean Environment and Energy, Griffith School of Environment, Griffith University, Queensland 4222, Australia
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  • Taicheng An,

    1. State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental, Resources Utilization and Protection, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, P.R. China
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  • Huagui Yang,

    1. Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, P.R. China
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  • Zhiyong Tang,

    1. National Centre for Nanoscience and Technology, Beijing 100190, P.R. China
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  • Weiping Cai,

    1. Key Laboratory of Materials Physics, Hefei Key Laboratory of Nanomaterials and Nanotechnology, Institutes of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, P.R. China
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  • Huijun Zhao

    Corresponding author
    1. Centre for Clean Environment and Energy, Griffith School of Environment, Griffith University, Queensland 4222, Australia
    • Centre for Clean Environment and Energy, Griffith School of Environment, Griffith University, Queensland 4222, Australia.
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Abstract

For the first time, a facile, one-pot hydrofluoric acid vapor-phase hydrothermal (HF-VPH) method is demonstrated to directly grow single-crystalline anatase TiO2 nanosheets with 98.2% of exposed {001} faceted surfaces on the Ti substrate via a distinctive two-stage formation mechanism. The first stage produces a new intermediate crystal (orthorhombic HTiOF3) that is transformed into anatase TiO2 nanosheets during the second stage. The findings reveal that the HF-VPH reaction environment is unique and differs remarkably from that of liquid-phase hydrothermal processes. The uniqueness of the HF-VPH conditions can be readily used to effectively control the nanostructure growth.

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