没食子酸在Nafion/单壁碳纳米管/聚(3-甲基噻吩)复合膜修饰电极上的电化学行为及测定  

Electrochemical Performance and Determination of Gallic Acid at the Nafion/SWNTs/P3MT Hybrid Film Modified Glassy Carbon Electrode

作　　者：许红岩[1] 王丽莉[1] 王彦怀[1] 陶绪泉[2] 王怀生[1] 

机构地区：[1]聊城大学化学化工学院,山东聊城252059 [2]聊城大学材料科学与工程学院,山东聊城252059

出　　处：《传感技术学报》2008年第7期1113-1118,共6页Chinese Journal of Sensors and Actuators

基　　金：国家自然基金资助(20475024;20775031);山东省自然科学基金资助(Y96B13032)

摘　　要：制备了Nafion分散羧基化的单壁碳纳米管/聚（3-甲基噻吩）复合膜修饰玻碳电极（N/S/P/GCE）,研究了没食子酸（GA）在此电极上的电化学行为和测定方法。实验结果表明,在0.1 mol/L pH 3.0的柠檬酸-柠檬酸钠（CBS）缓冲溶液中,N/S/P/GCE融合了SWNTs、P3MT和Nafion三者的优点,可以有效地催化没食子酸的电化学氧化,增强其氧化峰电流。在最佳实验条件下进行定量测定,GA的氧化峰电流与其浓度在4.0×10-7~4.0×10-6mol/L和6.0×10^-6~6.0×10-5mol/L两个范围内呈良好线性关系,相关系数分别为0.998 3和0.999 6,检测下限可达8.0×10-8mol/L GA。该方法可用于绿茶饮料中没食子酸含量的测定。A poly（3-methylthiophene） （P3MT） modified glassy carbon electrode coated with Nafion/single- walled carbon nanotubes film （Nafion/SWNTs） was fabricated and used for investigating the electrochemi- cal performance and the determination of gallic acid （GA）. The experimental results suggest that the com- posite films modified electrode combining the advantages of P3MT, SWNTs and Nafion exhibits dramatic electrocatalytic effect on the oxidation of GA and results in an obvious enhancement of the current re- sponse. This method is simple, rapid and effective to detect the GA by the cyclic voltammetry （CV） in two intervals, viz. 4. 0×10^-7-4. 0×10^-6 mol/L and 6. 0×10^-6-6. 0×10^-5 mol/L, with correlation coefficients of 0. 998 3 and 0. 999 6, respectively. The detection limit of GA can be estimated to be 8.0）4×10^-8 mol/L （S/N=3）. The method has been applied to the determination of the content of GA in green tea drinking with satisfactory results.

关 键 词：杂化膜修饰电极 没食子酸 聚(3-甲基噻吩) 单壁碳纳米管 NAFION 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置]