摘要
构建纳米金(Au)掺杂石墨烯(GS-Nafion)修饰玻碳电极(GCE)的电化学传感器(GCE/GS/Nafion/Au),研究多巴胺(DA)和抗坏血酸(AA)在上述电极的电化学行为,并用于DA的选择性测定。将GS-Nafion溶液涂覆于GCE表面制得GCE/GS/Nafion电极,采用化学镀方法于GCE/GS/Nafion电极表面生成Au制得GCE/GS/Nafion/Au电极,采用扫描电镜(SEM)表征GS、化学镀Au和电极的制备过程,循环伏安(CV)法和示差脉冲伏安(DPV)法研究DA的电化学性质。在优化的实验条件下,DA浓度与DPV法氧化峰电流大小在1.0×10-7～1.0×10-4mol/L之间呈线性关系,线性相关系数为0.9988,检出限为4.2×10-8mol/L。该电极制备过程简单、灵敏度高、抗干扰性强,可以用于DA的测定,结果令人满意。
An electrochemical sensor was fabricated by gold nanoparticles （Au）doping graphene sheets （GS）/ Nation modified glassy carbon electrode（GCE） （GCE/GS/Nafion/Au）.The electrochemical behavior of dopamine （DA） and ascorbic acid （AA）on the modified electrode were studied.The proposed modified electrode was also used to selective determination of DA.The GCE was modified by a dispersed solution of GS-Nation, followed by electroless plating of Au on it＇ s surface to fabricate GCE/GS/Nafion/Au electrode.Scanning electron micrography （SEM） was employed to characterize the GS,Au preparation and the construction processes of the sensor.Cyclic voltammetry（CV） and differential pulse voltammetry （DPV）were used to study the electrochemical properties of DA.Under the optimized experimental conditions,the oxidation peak current（ Ipa）was linear to DA concentration in the range from 1.0× 10^ -7 mol/L to .5.0 ×10^-4 mol/L （ R^2 = 0.9976 ） with a detection limit of 4.2 × 10^-8 mol/L.The proposed electrochemical sensor was sensitivity, strong anti-interference and easy preparation, which was suitable for screen-determination of DA.
出处
《食品工业科技》
CAS
CSCD
北大核心
2012年第8期88-91,共4页
Science and Technology of Food Industry
基金
怀化学院校级科研课题(HHUY2011-08)
湖南省高校产学研合作示范基地建设项目
湖南省教育厅科研基金(10C1059)
关键词
石墨烯
纳米金
NAFION
玻碳电极
多巴胺
graphene sheets
gold nanoparticles
Nation
glassy carbon electrodes
dopamine
