高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (4): 685.

• 研究论文 • 上一篇    下一篇

导电聚合物-半导体纳米颗粒自组装膜(Ⅱ)——光电化学性质

李东升, 吕功煊   

  1. 中国科学院兰州化学物理研究所, 羰基合成与选择氧化国家重点实验室, 兰州 730000
  • 收稿日期:2000-06-09 出版日期:2002-04-24 发布日期:2002-04-24
  • 通讯作者: 吕功煊(1964年出生),男,研究员,博士生导师,从事自组装膜和环境催化研究.
  • 基金资助:

    中国科学院基础局"九五"项目(批准号:KJ950-AC-505-02)资助.

Nanocomposite Films of Conductive Polymer/SemiconductorNanoparticles(Ⅱ)- Photoelectrochemical Properties

LI Dong-Sheng, LU Gong-Xuan   

  1. State Key Laboratory for Oxo Synthesis &Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanchou 730000, China
  • Received:2000-06-09 Online:2002-04-24 Published:2002-04-24

摘要: 研究了层层自组装技术制备的导电聚合物SPAn/纳米硫化镉复合膜的电化学和光电化学性质。单层SPAn膜在0.1mol/L的LiClO4/乙腈电解液中有弱的阴极光电流效应,为p型半导体;化学沉淀CdS膜为n型半导体。复合膜PSS/Q-CdS仅有阳极光电流效应,为CdS的n型半导体。自组装复合膜SPAn/Q-CdS有两种不同类型的光电响应,在阴极区(导电聚合物SPAn处于未掺杂状态)具有阴极光电流,在阳极区(SPAn处于导电状态)具有阳极光电流;导电聚合物的电化学状态对复合膜的光电化学性质有决定性作用。

关键词: 层层自组装, 纳米结构复合膜, 光电化学

Abstract: Using layer-by-layer self-assembly techniques, we successfully constructed nanostructured mul-tilayer films of conjugated polymer (sulfonic acid ring substituted polyaniline, SPAn)/semiconductornanoparticles(Q-CdS).Cyclic voltammograms of single layer film of SPAn in 0.1mol/L Na2SO4 solution(pH=3.0) consists of two redox peaks.The electrochemical processes associated with the peaks are twosteps redox doping.The S2- in the composite films is unstable and easily oxidized to product S, S2O32- and SO42- as being determined by X-ray photoelectron spectroscopy.The films of the first layer SPAn exhibiteda weak photoinduced cathodic current over the potential range between Oand -600 mV(vs.SCE) in 0.1mol/L LiClO4 solution in acetonitrile.The self-assembly films of SPAn/Q-CdSexhibited a photocathodicacurrent under cathodic bias and photoanodic current under anodic bias.In contract, the films of poy(sodi-um 4-styrenesolfonate)/Q-CdSonly exhibited a photoinduced anodic current from - 500 to 600 mV.Itimplied that the state(doping or undoping) of the conjugated polymer play an important role in determiningthe photoelectrochemical properties of the films.

Key words: Layer-by-layer self-assembly, Nanocomposite films, Photoelectrochemistry

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