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Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (11): 2581.

• Articles • Previous Articles     Next Articles

Effects of  Annealing on the Surface Photoelectronic Properties of TiO2 Nanotube/Nanowire Composite Arrays

YANG Feng1, CAI Fang-Gong1, KE Chuan1, ZHAO Yong1,2*, CHENG Cui-Hua1,2   

  1. 1. Key Laboratory of Advanced Technology of Materials,  Ministry of Education,  Superconductivity and New Energy R & D Center, Southwest Jiaotong University,  Chengdu  610031, China;
    2. School of Materials Science and Engineering, University of New South Wales, Sydney  2052,  Australia
  • Received:2011-05-05 Revised:2011-08-17 Online:2011-11-10 Published:2011-10-14
  • Contact: ZHAO Yong E-mail:yzhao@home.swjtu.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 50588201, 50872116)和中央高校基本科研业务费专项资金(批准号: 2009QK46, SWJTU09ZT24)资助.

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Abstract: TiO2 nanotube/nanowire composite arrays were fabricated on the Ti substrate via anodic oxidation method. Annealing effects on the surface photoelectronic properties of TiO2 nanotube/nanowire composite arrays were studied by surface photovoltage spectrum(SPS) and the electrical field induced surface photovoltage spectrum(FISPS). The results show   that the bound excitons exist at the edge of conduction band both in as-prepared and annealed TiO2 nanotube/nanowire composite arrays. The build-in field in as-prepared TiO2 nanotube/nanowire composite arrays is weak and the bound excitons can inverse antisymmetrically under external field. After being annealed, TiO2 nanotube/nanowire composite arrays were crystallized from amorphous structure, the build-in field is increased, but the SPS responses related to the bound excitons could exhibit only under positive field.

Key words: Surface photovoltage; , Field induced surface photovoltage; , TiO2 nanotube/nanowire composite array; , Bound exciton

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