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Microstructure, optical and photoelectron-chemical properties of TiO_2 microspheres prepared by hydrothermal method

机译:水热法制备TiO_2微球的结构,光学和光电子化学性质

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摘要

Anatase TiO_2 microspheres have been prepared by hydrothermal method and the reaction concentrations of mix solution containing hydrofluoric acid (HF) and ammonium fluoride (NH_4F) 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 TiO_2 3.2 eV as the reaction concentration increases. The pho-tocurrent of TiO_2 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 TiO_2 films and expand its applications.
机译:采用水热法制备了锐钛矿型TiO_2微球,其氢氟酸(HF)和氟化铵(NH_4F)混合溶液的反应浓度分别为0.1 M,0.2 M和0.4M。详细研究了沉积薄膜的微观结构,形貌,化学组成,光学和光电子化学性质。 XRD分析表明,随着反应浓度的增加,微球的晶粒尺寸增大。在0.1和0.2 M处沉积的膜是由大小为2-3μm的有孔的规则微球形成的。 XPS测量表明,对于0.2 M沉积的样品,Ti:O的原子比估计为1:2.05。随着反应浓度的增加,带隙接近锐钛矿型TiO_2 3.2 eV的标准值。在相同的照明条件下,沉积浓度为0.1 M的TiO_2薄膜的光电流约为0.2和0.4 M的三倍。目前的结果将有助于合成所需的TiO_2薄膜并扩展其应用。

著录项

  • 来源
    《Journal of materials science》 |2015年第4期|2070-2075|共6页
  • 作者单位

    School of Electronic and Electrical Engineering, Chuzhou University, Chuzhou 239000, China,School of Physics and Materials Science, Anhui University, Hefei 230601, China;

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

    School of Electronic and Electrical Engineering, Chuzhou University, Chuzhou 239000, China;

    School of Electronic and Electrical Engineering, Chuzhou University, Chuzhou 239000, China;

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

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

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

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

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 13:45:22

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