抗坏血酸在石墨烯修饰电极上的电催化行为研究

Electrochemical Behavior of Ascorbic Acid at Graphene Modified Electrode

本文制备了単链DNA修饰的石墨烯纳米片,构建了石墨烯修饰电极(GR/BPG),采用循环伏安法和计时电流法研究了该修饰电极上抗坏血酸的电化学行为。结果表明该电极能显著提高抗坏血酸的氧化还原电流,同时还讨论了支持电解质种类、酸度和扫描速度等因素对抗坏血酸伏安响应的影响。在优化实验条件下,抗坏血酸工作曲线的线性范围为0.11～1.21μmol·L-1。

An basal plane graphite electrode modified with ssDNA dispersed graphene sheets （GR/BPGE） was fabricated and the electrochemical behavior of ascorbic acid （AA） was investigated by cyclic voltammetry and chronoamperometry. Compared with the bare electrode, the oxidation peak current of ascorbic acid increased markedly. The effects of substrate solution, acidity and scan rate on the voltammetric behavior of ascorbic acid were studied. The resulting electrochemical sensor exhibited fast amperometric response to ascorbic acid. The calibration range of ascorbic acid was from 0.11 to 1.21μmol L-1.