物理化学学报 >> 2006, Vol. 22 >> Issue (03): 261-264.doi: 10.3866/PKU.WHXB20060301

研究论文    下一篇

聚吡咯纳米阵列电极的光电化学

刘玲;赵尧敏;杨洁;赵崇军;江志裕   

  1. 复旦大学化学系, 分子催化和创新材料上海重点实验室, 上海 200433
  • 收稿日期:2005-06-26 修回日期:2005-09-20 发布日期:2006-03-10
  • 通讯作者: 江志裕 E-mail:zyjiang@fudan.ac.cn

Photoeletrochemical Behavior of Polypyrrole Nanofiber Array Electrodes

LIU Ling; ZHAO Yao-Min; YANG Jie; ZHAO Chong-Jun; JIANG Zhi-Yu   

  1. Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, P. R. China
  • Received:2005-06-26 Revised:2005-09-20 Published:2006-03-10
  • Contact: JIANG Zhi-Yu E-mail:zyjiang@fudan.ac.cn

摘要: 以多孔的铝阳极氧化膜(AAO)为模板制备了直径约为80 nm聚吡咯(PPy)纳米线的阵列电极, 并研究了它的光电化学响应. 结果表明, 在电极电位低于-0.1 V(vs Ag/AgCl)时出现的阴极光电流是由聚吡咯纳米线的p型半导体性质引起的, 其平带电位为-0.217 V. 聚吡咯纳米线的长度对光电流的影响较大, 最佳长度为42 nm. 这是因为在很短的聚吡咯纳米线阵列中PPy太少, 产生的光电流弱, 而在过长的聚吡咯纳米线阵列中光生电子在到达电极基底前易于与光生空穴复合而消失. 聚吡咯纳米线有可能作为纳米光电器件用于未来微器件系统.

关键词: 聚吡咯, 阳极氧化铝膜, 纳米线阵列, 光电化学

Abstract: Polypyrrole (PPy) nano-fiber array electrodes were fabricated by electrochemical deposition of PPy in the pores of anodic aluminium oxide (AAO) templates. The photocurrent appeared at the potential below -0.1 V (vs Ag/AgCl) was caused by the p-type semiconductor properties of PPy material. Its flat-band potential Efb was determined as -0.217 V (vs Ag/AgCl). The photocurrent of PPy nano-fiber array electrode varied with the length of the PPy nanofibers. For very thin PPy nano-fiber array the photocurrent was small. But if the arrays were too thick the photocurrent was also small because the photo-induced electrons might recombine with photo-induced holes in the film before reaching the back contact. The optimum thickness was 42 nm. The PPy nano-fiber devices might be used as nano photo-electronic device in the future.

Key words: Polypyrrole, Anodic aluminium oxide membrane, Nano-fiber arrays, Photoelectrochemistry