【摘要】 在石墨烯纳米片修饰电极(GN/GCE)上,通过电聚合的方法制备了新颖的桑色素/石墨烯复合修饰电极(M/GN/GCE)。以多巴胺(DA)和抗坏血酸(AA)为模型化合物,运用循环伏安法(CV)和差示脉冲伏安法(DPV)考察了该复合修饰电极的电催化行为。在pH 7.0的PBS中,DA和AA分别在0.172 V和-0.183 V产生氧化峰,峰位差达355 mV。与单一修饰电极(桑色素修饰电极(M/GCE)、石墨烯修饰电极(GN/GCE)及裸玻碳电极(GCE))相比,DA在M/GN/GCE上的峰电流显著增大。在优化的实验条件下,DA在2.0×10-8～5.5×10-4mol/L浓度范围内与其峰电流具有良好的线性关系,检出限达9.0×10-9mol/L。更多还原

【Abstract】 A morin/graphene modified glassy carbon electrode(M/GN/GCE) was fabricated by electro-polymerizing morin(M) on the surface of graphene nanosheets(GN).Taking the dopamine(DA) and ascorbic acid(AA) as model compounds,the electrochemical behaviors of the modified electrode were investigated by using cyclic voltammetry(CV) and differential pulse voltammetry(DPV).In pH 7.0 phosphate buffer solution(PBS),the anodic peak potentials of DA and AA were 0.172 V and-0.183 V,respectively,with a peak to peak separation up to 355 mV.In comparison with bare glassy carbon electrode(GCE),morin modified glassy carbon electrode(M/GCE) and graphene modified glassy carbon electrode(GN/GCE),the M/GN/GCE has superior electrocatalytic activity toward the oxidation of DA.The results demonstrated that the aromatic structure of M endows it strongly adsorption on GN via π-π stacking which could improve the selectivity and sensitivity for the determination of DA in the presence of AA.The peak currents obtained from DPV were linearly related to the concentrations of DA in the range of 2.0×10-8-5.5×10-4 mol/L with a detection limit of 9.0×10-9 mol/L.更多还原