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Microstructure, optical and photoelectron-chemical properties of TiO2 microspheres prepared by hydrothermal method

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Abstract

Anatase TiO2 microspheres have been prepared by hydrothermal method and the reaction concentrations of mix solution containing hydrofluoric acid (HF) and ammonium fluoride (NH4F) are 0.1, 0.2, and 0.4 M, respectively. Microstructure, morphology, chemical composition, optical and photoelectron-chemical properties of the as-deposited thin films were investigated in detail. XRD analysis shows that the grain size of the microspheres increases with increasing the reaction concentration. The films deposited at 0.1 and 0.2 M are formed by wellfaceted, regular microspheres with the size of 2–3 μm. XPS measurement indicates that the atomic ratio of Ti:O is estimated to be 1:2.05 for the sample deposited at 0.2 M. The band gap is close to the standard values of anatase TiO2 3.2 eV as the reaction concentration increases. The photocurrent of TiO2 film deposited for 0.1 M reaction concentration is around three times as strong as those for 0.2 and 0.4 M under the same illumination. Current results will help to synthesise desired TiO2 films and expand its applications.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (Nos. 51272001 and 51472003), National Key Basic Research Program (2013CB632705), the National Science Research Foundation for Scholars Return from Overseas, Ministry of Education, China, Science Foundation for The Excellent Youth Talents of Chuzhou University (2013RC007), Research Project of Chuzhou University (2014KJ01) and Innovation Entrepreneurship Training Program for College Students of Chuzhou University (2014CXXL036). The authors would like to thank Zhongqing Lin of the Experimental Technology Center of Anhui University, for electron microscope test and discussion.

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Authors and Affiliations

  1. School of Electronic and Electrical Engineering, Chuzhou University, Chuzhou, 239000, China

    Xishun Jiang, Zhongwei Li & Yunfang Ren

  2. School of Physics and Materials Science, Anhui University, Hefei, 230601, China

    Xishun Jiang, Miao Zhang, Gang He, Xueping Song & Zhaoqi Sun

  3. School of Material Science and Chemical Engineering, Chuzhou University, Chuzhou, 239000, China

    Yafang Zhang

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  1. Xishun Jiang
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Correspondence to Xishun Jiang or Zhaoqi Sun.

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Jiang, X., Zhang, Y., Li, Z. et al. Microstructure, optical and photoelectron-chemical properties of TiO2 microspheres prepared by hydrothermal method. J Mater Sci: Mater Electron 26, 2070–2075 (2015). https://doi.org/10.1007/s10854-014-2649-9

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  • DOI: https://doi.org/10.1007/s10854-014-2649-9

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