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Preparation of sodium titanate nanotubes modified by CdSe quantum dots and their photovoltaic characteristics

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Abstract

Sodium titanate nanotubes have been prepared and modified chemically with CdSe quantum dots (QDs) using bifunctional modifiers (HS-COOH). Their photovoltaic characteristics have also been studied. The results indicate that the surface photovoltage response of nanotubes extends to the visible light region, and the intensity of surface photovoltage is enhanced after modification with CdSe QDs. The field-induced surface photovoltage spectroscopy (FISPS) shows that sodium titanate nanotubes have different photovoltaic response before and after modification. That is, the surface photovoltaic response of pure sodium titanate nanotubes increases with the enhancement of positive applied bias and decreases with the enhancement of negative applied bias. Meanwhile, the surface photovoltaic response of CdSe modified sodium titanate nanotubes is different from that of the pure sodium titanate nanotubes. The whole spectrum increases with the enhancement of applied bias at the first stage. However, when the applied bias reaches a certain value, the surface photovoltage response keeps increasing in some spectrum regions, while decreasing in other spectrum regions. This novel phenomenon is explained by using an electric field induced dipole model.

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Authors and Affiliations

  1. Key Lab for Special Functional Materials of Ministry of Education, Henan University, Kaifeng, 475004, China

    HongMei Zhang, Ke Cheng, YanLing Ji, XiaoLan Liu, LinSong Li, XingTang Zhang & ZuLiang Du

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  1. HongMei Zhang
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  2. Ke Cheng
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  3. YanLing Ji
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Correspondence to ZuLiang Du.

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Supported by the Program for New Century Excellent Talents in University (Grant No. NCET-04-0653), 973 Plan (Grant No. 2007CB616911) and the National Natural Science Foundation of China (Grant Nos. 20371015 and 90306010)

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Zhang, H., Cheng, K., Ji, Y. et al. Preparation of sodium titanate nanotubes modified by CdSe quantum dots and their photovoltaic characteristics. Sci. China Ser. B-Chem. 51, 976–982 (2008). https://doi.org/10.1007/s11426-008-0023-6

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  • DOI: https://doi.org/10.1007/s11426-008-0023-6

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