摘要
以对氨基苯磺酸功能化石墨烯(AS-GS)和0.1% Nafion的甲醇溶液制备了一种新型的复合膜修饰电极.采用扫描电镜(SEM)对修饰电极进行了表征,并利用循环伏安法(CV)和微分脉冲伏安法(DPV)研究了咖啡因(CAF)在修饰电极上的电化学行为.在最优条件下,修饰电极对咖啡因的氧化有良好的电催化活性,氧化峰电流与咖啡因浓度在1~500μmol·L^ -1范围内呈良好的线性关系,检测限为5.31×10-7 mol·L^ -1(S/N=3).此外, AS-GS/Nafion复合膜修饰电极具有较高的灵敏性,较好的稳定性和重现性,可用于可乐和功能性饮料中咖啡因含量的快速检测.
The sulfanilic acid functionalized graphene sheets (AS-GS ) and methanol solution of 0.1%nafion are used to fabricate a new type of composite film modified electrode . T he modified electrode is characterized by scanning electron microscope (SEM ) . The electrochemical behaviors and kinetic properties of caffeine on the modified electrode are investigated by cyclic voltammetry (CV ) and the differential pulse voltammetry(DPV) . The modified electrode displays excellent electrochemical catalytic activities toward the oxidation of caffeine under the optimum condition . The peak current is linearly dependent on the CAF concentrations in the range of 1~500 μmol·L^ -1 with the detection limit (S/N=3) of 5.31 × 10-7 mol·L^ -1 . In addition , the composition film of AS-GS/Nafion modified electrode show s high sensitivity ,favorable stability and reproducibility .Moreover ,AS-GS/Nafion modified electrode has been applied to the quick determination of CAF in the cola and functional beverage .
出处
《西北师范大学学报(自然科学版)》
CAS
北大核心
2014年第3期64-70,共7页
Journal of Northwest Normal University(Natural Science)
基金
国家自然科学基金资助项目(20873101)
教育部创新团队资助项目
关键词
石墨烯
对氨基苯磺酸
咖啡因
修饰电极
graphene
Nafion
sulfanilic acid
caffeine
modified electrode