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化学学报
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化学学报 ›› 2005, Vol. 63 ›› Issue (11): 1008-1012. 上一篇    下一篇

研究论文

掺Sn的纳米TiO2表面光生束缚激子的验证及其特性

井立强1 2，王德军3，辛柏福1，王百齐1，薛连鹏1，付宏刚*a b，孙家锺1 2   

  1. (1黑龙江大学化学化工与材料学院 物理化学重点实验室 哈尔滨 150080)
    (2吉林大学理论化学研究所 理论化学与计算国家重点实验室 长春 130023)
    (3吉林大学化学学院 长春 130023)
  • 投稿日期:2004-08-06 修回日期:2005-02-24 发布日期:2010-12-10
  • 通讯作者: 付宏刚

Identification and Characteristics of the Photoinduced Bound Excitons on the Surface of Sn Doped TiO2 Nanocrystallite

JING Li-Qiang1,2, WANG De-Jun3, XIN Bai-Fu1, WANG Bai-Qi1, XUE Lian-Peng1, FU Hong-Gang*a b, SUN Jia-Zhong1,2   

  1. (1 The Laboratory of Physical Chemistry, School of Chemistry and Material Sciences, Heilongjiang University,
    Harbin 150080)
    (2 China State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry,
    Jilin University, Changchun 130023)
    (3 School of Chemistry, Jilin University, Changchun 130023)
  • Received:2004-08-06 Revised:2005-02-24 Published:2010-12-10
  • Contact: FU Hong-Gang

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采用溶胶-凝胶法制备了不同掺杂Sn的TiO2纳米粒子, 并主要利用表面光电压谱(SPS)和电场诱导表面光电压谱(EFISPS)对样品进行了表征, 重点探讨了焙烧温度和掺Sn量对TiO2光生电荷性质的影响. 同时揭示了样品结构与表面光生束缚激子的关系及其特性. 结果表明: 与束缚激子相关的光伏响应只在含有金红石相的TiO2样品中出现, 且在混晶相中表现得更加显著. 掺杂适量Sn不仅提高了纳米TiO2的与带带跃迁相关的SPS响应强度, 同时也使与束缚激子相关的SPS响应明显增强.

关键词: TiO2, 溶胶-凝胶法, 掺杂, Sn, 表面光伏, 束缚激子

The different Sn doped TiO2 nanoparticles were prepared by a sol-gel process, and also mainly characterized by the surface photovoltage spectrum (SPS) and the electrical field induced surface photovoltage spectrum (EFISPS). The effects of calcining temperature and Sn dopant content on the properties of photoinduced charges of TiO2 were discussed in details, and the relationships between the structure and bound excitons as well as the characteristics of bound excitons of the as-prepared samples were revealed. The results showed that the SPS responses related to the bound excitons could exhibit only in the TiO2 samples containing a certain amount of rutile, especially for those samples with the coexistence of the anatase and rutile. Sn dopant with appropriate content not only enhanced greatly the intensity of SPS responses related to the band-band transitions of TiO2, but also made the intensity of SPS responses related to the bound excitons increase markedly.

Key words: TiO2, gol-gel, doping, tin, surface photovoltage, bound exciton