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首页> 外文期刊>International Journal of Electrochemical Science >A Highly Sensitive Dopamine Sensor Based on Graphene Quantum Dots Modified Glassy Carbon Electrode
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A Highly Sensitive Dopamine Sensor Based on Graphene Quantum Dots Modified Glassy Carbon Electrode

机译：基于石墨烯量子点修饰玻碳电极的高灵敏度多巴胺传感器

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摘要

A graphene quantum dots (GQDs) modified glassy carbon electrode (GCE), namely GQDs/GCE wasprepared by electrodeposition method, which was characterized by chronocoulometry andelectrochemical impedance spectra. The electrochemical behavior of the prepared modified electrodetowards the catalytic oxidation of dopamine (DA) in pH 7.0 phosphate buffer solution was investigatedby cyclic voltammetry and differential pulse voltammetry. It was demonstrated that the modifiedelectrode presented good electrocatalytic activity and had favorable electrochemical response towardsDA without the interference of ascorbic acid. The probable mechanism on the modified electrodesurface was proposed. Under optimum conditions, the dependence of current vs. concentration waslinear from 0.4 to 100 ?M with a regression coefficient of 0.997, and the detection limit of DA was 50nM (S/N=3). Analytical application of GQDs/GCE was successfully tested in the determination of DAin real samples.
机译：通过电沉积法制备了石墨烯量子点（GQDs）修饰的玻碳电极（GQDs / GCE），通过计时容量法和电化学阻抗谱进行了表征。通过循环伏安法和微分脉冲伏安法研究了制备的修饰电极对pH 7.0磷酸盐缓冲溶液中多巴胺（DA）催化氧化的电化学行为。结果表明，修饰电极具有良好的电催化活性，对DA的电化学反应良好，无抗坏血酸的干扰。提出了修饰电极表面的可能机理。在最佳条件下，电流对浓度的依赖性在0.4至100μM之间呈线性关系，回归系数为0.997，DA的检出限为50nM（S / N = 3）。 GQDs / GCE的分析应用已成功测试了真实样品中DA的测定。

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