石墨烯修饰电极对抗坏血酸和多巴胺的同时检测  

Simultaneous detection of ascorbic acid and dopamine using graphene modified electrode

作　　者：史晓霞[1] 李琳[1] 王珂[1] 吴霞琴[1] 王荣[1] 

机构地区：[1]上海师范大学生命与环境科学学院,上海200234

出　　处：《化学传感器》2013年第1期18-23,共6页Chemical Sensors

基　　金：国家自然科学基金(批准号:20973114)资助

摘　　要：通过将电化学聚合的聚赖氨酸膜(PLL)修饰的玻碳电极浸入氧化石墨烯(GO)溶液中4h,利用电化学方法将电极上吸附的氧化石墨烯进行还原(ERGO),然后滴涂聚阳离子电解质(PDDA)制得PDDA/ERGO/PLL/GC修饰电极。研究了抗坏血酸和多巴胺在该修饰电极上的电化学行为,结果表明在PDDA和石墨烯的共同作用下,使得抗坏血酸(AA)和多巴胺(DA)的氧化峰电位负移,两者的氧化峰电位差达到140mV。利用微分脉冲伏安法考察了抗坏血酸和多巴胺的同时测定,AA的线性范围是0.2～2mmol/L,DA的线性范围是1～230μmol/L。该修饰电极具有良好的稳定性和重现性。Polydimethyl-diallylammonium chloride （PDDA） was dropped on electrochemically reduced graphene oxide （ERGO） which was adsorbed on the poly-L-lysine （PLL） modified glassy carbon electrode by immersed in grapheme oxide （GO） solution for 4h. The electrochemical behavior of the PDDA/ERGO/PLL/GC modified electrodes in ascorbic acid and dopamine solution have been investigated. The results showed that oxidation peek potential of ascorhic acid （AA） and dopamine （DA） have shifted negatively, the oxidation peek potential difference of AA and DA reached about 140 mV due to the action of PDDA and graphene. The simultaneous determination of AA and DA have done with differential pulse voltammetry, with a linear range of 0.2～2 mmol/L for AA, 1-230 μmol/L for DA. This PDDA/ERGO/PLL/GC modified electrode has a good stability and repeatability.

关 键 词：石墨烯 抗坏血酸 多巴胺 尿酸 微分脉冲伏安法 

分 类 号：O657.1[理学—分析化学]