化学学报 ›› 2011, Vol. 69 ›› Issue (04): 477-482. 上一篇    下一篇

研究论文

聚吡咯涂层的电化学合成及对神经微电极电性能的影响

邓萌,汪茫,陈红征*   

  1. (高分子合成与功能构造教育部重点实验室 浙江大学高分子科学与工程学系 杭州 310027)
  • 收稿日期:2010-04-08 修回日期:2010-09-17 出版日期:2011-02-28 发布日期:2010-10-21
  • 通讯作者: 陈红征 E-mail:hzchen@zju.edu.cn
  • 基金资助:

    国家自然科学基金项目;高等学校博士学科点专项科研基金

Electrochemically Synthesized Polypyrrole Coatings and Their Effect on Electrical Properties of Neural Microelectrode

DENG Meng, WANG Mang, CHEN Hong-Zheng   

  1. (MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027)
  • Received:2010-04-08 Revised:2010-09-17 Online:2011-02-28 Published:2010-10-21

通过改变掺杂剂种类、反应时间、电流密度等合成条件, 在神经微电极表面通过电化学沉积一系列厚度及形貌不同的导电高分子聚吡咯(PPy)涂层. 通过X射线光电子能谱及扫描电子显微镜对所得涂层化学组成及形貌进行表征.研究了PPy涂层对神经微电极电性能的影响. 电化学阻抗谱表明, 在神经信号相关的1 kHz频率处, 神经微电极阻抗值可降低至原来的1/55. 循环伏安曲线表明, 随PPy合成时间加长或电流密度提高, 电极总电容量随之增大.

关键词: 聚吡咯, 神经微电极, 电化学阻抗谱, 循环伏安法

A series of conducting polypyrrole (PPy) coatings with different thickness and morphology were electrochemically synthesized on neural microelectrodes. The chemical component and morphology of PPy coatings were characterized by X-ray photoelectron spectroscopy and scanning electron microscope. The effect of PPy coatings on electrical properties of neural microelectrode was further studied. Electrochemical impedance spectroscopy of neural microelectrodes before and after PPy coating indicated that the neural microelectrode s impedance after PPy coating dropped to 1/55 of that without PPy coating. Cyclic voltammograms showed that the electric capacity of neural microelectrode with PPy coating was evidently increased with a longer reaction time or a higher current density within a range.

Key words: polypyrrole, neural microelectrode, electrochemical impedance spectroscopy, cyclic voltammetry