物理化学学报 >> 2011, Vol. 27 >> Issue (12): 2814-2820.doi: 10.3866/PKU.WHXB20112814

电化学和新能源 上一篇    下一篇

CdS量子点与金电极之间的光生电子交换

岳钊, 张维, 王程, 刘国华, 牛文成   

  1. 南开大学电子系, 天津 300071
  • 收稿日期:2011-08-12 修回日期:2011-10-02 发布日期:2011-11-25
  • 通讯作者: 岳钊 E-mail:yuezhao@nankai.edu.cn
  • 基金资助:

    国家自然科学基金(61001056, 60871028)和天津市自然科学基金(10JCZDJC15300)资助项目

Photoinduced Electron Transfer between CdS Quantum Dots and Gold Electrodes

YUE Zhao, ZHANG Wei, WANG Cheng, LIU Guo-Hua, NIU Wen-Cheng   

  1. Department of Electronics, Nankai University, Tianjin 300071, P. R. China
  • Received:2011-08-12 Revised:2011-10-02 Published:2011-11-25
  • Contact: YUE Zhao E-mail:yuezhao@nankai.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (61001056, 60871028) and Natural Science Foundation of Tianjin, China (10JCZDJC15300).

摘要: 对光照下CdS量子点与金电极之间的光生电子交换过程进行了系统研究. 首先, 对基于电子隧穿的多个光生电子转移过程进行了理论分析, 并进行了数学模型推导. 其次, 利用推导的数学模型在不同参数的条件下进行了仿真研究. 最后, 测量了CdS量子点修饰的金电极在不同偏置电压、不同光强和不同氧化物及还原物浓度的条件下产生的光电流, 并将实验、理论及仿真结果三者相结合进行了分析讨论. 实验结果与仿真结果都证明了理论模型的正确性.

关键词: 量子点, 电子隧穿, 光生电子交换, 光电流, 光电化学

Abstract: For a better design of quantum dots (QDs) based photoelectrochemical sensors, photoinduced electron transfer between CdS QDs and gold electrodes was studied. First, a theoretical study and mathematical model are given wherein several electron tunneling processes compete with each other to give a photocurrent under illumination. Second, simulations with different parameters were carried out. Finally, photocurrents from CdS QDs modified gold electrodes with dithiol groups were measured under different conditions. The results show that the amplitudes and directions of the photocurrents are affected by the applied potential, the light intensity, and the concentrations of oxidants and reducers. The experimental results were then compared with the simulation results and analyzed based on the model given. By comparing the simulation and experimental results the theoretical study and the mathematical model are shown to be accurate.

Key words: Quantum dot, Electron tunneling, Photoinduced electron transfer, Photocurrent, Photoelectrochemistry

MSC2000: 

  • O649