碳纳米管-聚3,4-乙撑二氧噻吩修饰电极

Electrode Modified by Carbon Nanotubes and Poly(3,4-ethylenedioxythiophene)

为克服传统电极电信号传导性能弱、生物相容性差的缺点,采用碳纳米管-导电聚合物对电极进行修饰,使其具有理想的粗糙表面和较大的活性界面面积。以化学自组装法在金电极表面修饰单壁碳纳米管,然后在表面采用电化学聚合法进一步修饰导电聚合物聚3,4-乙撑二氧噻吩。拉曼光谱及电镜分析表明自组装的碳纳米管与导电聚合物在金电极表面形成了良好的复合修饰层。电极修饰后氧化还原峰位差从裸金电极的70 mV减小为65 mV,同时循环伏安曲线的包覆面积明显增大,电极表面电子通量提高。

To overcome the shortcomings of weak signal transduction and limited biocompatibility of traditional electrode,the electrode is modified by carbon nanotubes and conducting polymer for an ideal roughness surface and bigger activity interface area.Single-walled carbon nanotubes（SWNTs）are modified on the surface of gold electrode by the chemical self-assembly method.The electrode is modified by the conducting polymer poly（3,4-ethylenedioxythiophene）by electrochemical polymerization.Raman spectrum and electron microscopy analysis confirm that the self-assembled SWNTs and conducting polymer perform a good compound modified layer onto the gold electrode surface.After the electrode being modified,the redox peak-to-peak separation decreases from 70 mV to 65 mV,the enclosed area of the cyclic voltammetry（CV）curve increases,and the electron flux of the electrode surface is improved.