纳米银-石墨烯修饰玻碳电极检测咖啡因  

Determination of Caffeine based on Ag-graphene Modified Glassy Carbon Electrode

作　　者：徐婧[1] 臧文玲 王景宇[1] 马丽娜[1] 郭明[1] 

机构地区：[1]大连大学环境与化学工程学院,辽宁大连116622

出　　处：《大连大学学报》2015年第3期56-60,共5页Journal of Dalian University

摘　　要：本文采用化学还原氧化石墨烯的方法制备了纳米银-石墨烯（Ag-GR）复合材料,用此材料制备了纳米银-石墨烯电化学传感器（Ag-GR/GCE）,并利用循环伏安法研究了咖啡因的电化学行为。以0.01 mol/L的H2SO4为底液在0.5~1.7 V电压范围,于1.579 V左右有一氧化峰,线性范围为2×10-6~6×10-5 mol/L和6×10-5~2×10-3 mol/L,检出限（S/N=3）为6×10-7 mol/L。将传感器已用于咖啡因的检测,效果较好。Electrochemical sensor for caffeine determination based on a glassy carbon electrode modified with Ag-graphene（Ag-GR/GCE） was fabricated in this paper. Electrochemical behaviors of caffeine on Ag-GR/GCE were investigated by cyclic voltammetry at the voltage range of 0.5~1.7 V. Results showed there was a sensitive oxidative peak at ＋1.579 V in 0.01 mol/L H2SO4. Under the optimized conditions, the oxidation peak current was linear to the caffeine concentrations in the range of 2×10-6 to 6×10-5 mol/L and 6×10-5 to 2×10-3 mol/L with the detection limit of 6.0×10-7 mol/L（S/N=3）. This electrochemical sensor was applied to determined tea samples with satisfactory results.

关 键 词：咖啡因 纳米银 石墨烯 循环伏安法 

分 类 号：O657.1[理学—分析化学]