羧基化石墨烯修饰玻碳电极对多巴胺电催化性能影响的研究

摘要

在玻碳电极表面修饰上羧基化石墨烯制得羧基化石墨烯修饰电极，以此电极为工作电极，研究了多巴胺在此电极上的电化学行为．在pH=3．0的Na：HPO4-C6H8O7，缓冲溶液中，氧化峰电流与多巴胺浓度在1．4×10^-3-1．8×10^-4moL／L的范围内呈良好的线性关系，检出限为5．0×10^-6mol／L．实验结果表明，玻碳电极经羧基化石墨烯修饰后对多巴胺具有明显的电催化作用，灵敏度明显提高．%Carbonylated graphene was used to modify glassy carbon electrode surface to prepare carhonylated graphene modified glassy carbon electrode, and the electrochemical behaviors of dopamine were studied on this mod- ified electrode. The experimental parameters such as the supporting electrolyte, buffer pH, the accumulation poten- tial and time, were optimized in detailed. The results showed that the oxidation peak currents varied linearly with the concentration of DA in the range froinl. 4 ×10^-3 mol/L to 1.8 ×10^-4mol/L and the detection limit was 5.0 ×10^-6mol/L, in pH =3.0 phosphate buffer solution.