Molecule-Assembled Modulation of the Photocurrent Direction of TiO2 Nanotube Electrodes under the Assistance of the Applied Potential and the Excitation Wavelength

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• 作者：Jianzhang Zhou ; Lingling Lin ; Lijing Zhang ; Zhonghua Lin
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：September 1, 2011
• 年：2011
• 卷：115
• 期：34
• 页码：16828-16832
• 全文大小：855K
• 年卷期：v.115,no.34(September 1, 2011)
• ISSN：1932-7455

文摘

In this article, a type of molecule-modulated electrode was assembled by conjugating TiO₂ nanotubes with protocatechuic acid (PCA) and DNA-linked PCA (DNA鈥揚CA). We found that the photoelectrochemical behavior of the resulting PCA- and DNA鈥揚CA-assembled TiO₂ nanotube electrodes, especially the photocurrent direction, could be modulated by the assembled molecules under the assistance of an applied potential and excitation wavelength. Unlike bare TiO₂ nanotube electrodes, which generate only anodic photocurrents, those assembled with PCA molecules and ssDNA鈥揚CA molecules were found to generate anodic or cathodic photocurrents depending on the applied potential. Moreover, TiO₂ nanotube electrodes assembled with dsDNA鈥揚CA molecules generated either anodic or cathodic photocurrent depending on the specific applied potential and the excitation wavelength. The related photoexcited charge-transfer processes discussed herein are influenced by the assembled molecules.