Preparation of A Sensor Based on Graphene Modified Electrode and Molecularly Imprinted Polymers and Its Determination on Dopamine

An electrochemical sensor based on dropped molecular imprinted polymers(MIPs) suspension for dopamine was fabricated.Influences of pH value,concentrations of graphene and MIPs were also optimized.The optimal conditions were as follows:pH value:7.0,concentration of graphene:0.5 g/L,concentration of MIPs:20 g/L.Under the optimal conditions,the prepared sensor showed good selectivity and high sensitivity for dopamine.The DPV peak current is linear to the DA concentration in the range of 2.0×10-7-1.0×10-4 mol/L,with a detection limit(S/N=3) of 6.8×10-8 mol/L.The prepared sensor was successfully applied in the determination of dopamine hydrochloride with recoveries of 98%-105%.