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用滴涂法和两步电化学聚合法制备了一种石墨烯夹心式聚中性红修饰电极(PNR/GN/GCE),并用循环伏安法、微分脉冲伏安法和交流阻抗法表征了该复合物膜的电化学行为。石墨烯夹心式聚中性红复合物薄膜提高了电极表面的电子转移速率,薄膜结合牢固,电催化氧化作用明显。在p H 5的磷酸缓冲溶液中,选择扫速0.1 V/s,多巴胺的氧化峰电位相比裸玻碳电极负移了103 m V,峰电流增加7倍,检出限达到4.9×10-9mol/L(S/N=3),氧化峰电流与多巴胺浓度在1.6×10-8~2.0×10-6mol/L范围内现良好的线性关系,相关系数R=0.994。
A graphene filled poly-neutral red modified electrode (PNR / GN / GCE) was prepared by a drop-coating method and a two-step electrochemical polymerization method. Cyclic voltammetry, differential pulse voltammetry and AC impedance were used to characterize The electrochemical behavior of the composite membrane. The graphene sandwich type poly-neutral red composite film increases the electron transfer rate on the surface of the electrode, and the film is firmly bonded with the electrocatalytic oxidation effect obviously. In the phosphate buffer solution of p H 5, the oxidation potential of dopamine was shifted by 103 m V and the peak current was increased by 7 times and the detection limit was 4.9 × 10 -3. 9mol / L (S / N = 3). The peak current of oxidation and dopamine concentration in the range of 1.6 × 10-8 ~ 2.0 × 10-6mol / L showed a good linear relationship, the correlation coefficient R = 0.994.