聚3,4-乙撑二氧噻吩/金复合电极的制备及其在多巴胺检测中的应用  

Preparation of poly( 3,4-ethylenedioxythiophene)/gold composite electrode and its application in dopamine detection

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作  者:王保光[1,2] 邱吟 胡海峰[1] 张雪华[1] 何声太[2] 贺涛[1] 

机构地区:[1]国家纳米科学中心,北京100190 [2]天津工业大学材料科学与工程学院,天津300387

出  处:《应用化工》2015年第3期569-574,共6页Applied Chemical Industry

基  金:国家重点基础研究发展计划(973计划2011CB933200)

摘  要:在水溶液中,以对甲苯磺酸钠为支持电解质,在氧化铟锡导电玻璃上,采用电化学恒电位极化法制备聚3,4-乙撑二氧噻吩( PEDOT)修饰电极。通过电化学循环伏安法,在PEDOT电极上沉积金纳米颗粒( Au NPs),制得PEDOT/Au复合修饰电极,用于多巴胺( DA)的电化学检测。考察了PEDOT/Au复合修饰电极中Au NPs的沉积量对DA电化学检测响应的影响,同时研究了在干扰物质抗坏血酸( AA)和尿酸( UA)存在时,PEDOT/Au复合修饰电极对DA的检测。结果表明,在中性pH溶液中,利用PEDOT/Au复合修饰电极,采用差分脉冲伏安法检测DA的线性范围为5×10-6~1×10-4 mol/L,最低检测限可达1×10-8 mol/L,且能有效排除AA和UA的干扰,实现三者的同时检测。The poly( 3,4-ethylenedioxythiophene)( PEDOT) electrode was synthesized on indium tin oxide( ITO) glass substrate via electrochemical polarization under a constant bias in sodium p-toluenesulfonate( Ts ONa) aqueous solution. PEDOT / Au composite electrode was fabricated through cyclic voltammetry method and then was used for electrochemical detection of dopamine( DA). The influence of the loading amount of Au NPs in the PEDOT / Au composite electrode on DA detection was discussed. Furthermore,the electrochemical detection of DA was also studied using the PEDOT / Au electrode in the presence of ascorbic acid( AA) and uric acid( UA). The result showed that in neutral aqueous solution,the DA concentration could be determined in a linear range of 5 × 10- 6~ 1 × 10- 4mol / L,and the detection limit of DA was found to be 1 × 10- 8mol / L. The results indicated that the PEDOT / Au composite film showed high sensitivity and selectivity for DA electrochemical detection even in the presence of interferents like AA and UA.

关 键 词:聚3 4-乙撑二氧噻吩 金纳米颗粒 多巴胺 PEDOT/Au复合修饰电极 电化学检测 

分 类 号:TQ035[化学工程] TQ320.772

 

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