Development And Application Of Electrochemical Sensor Based On Molecular Imprinting Material Modification

Molecularly imprinted polymers(MIPs)are widely used in many fields because of their predefined structure-activity and specific recognition of target molecules.In addition,carbon nanotubes have been widely used in many fields such as materials,catalysis,sensing and so on,because of their good volume effect,surface effect and quantum effect.Metal nanoparticles have quantum size effect,surface effect and quantum tunneling effect,so they can be used as an ideal material for functional nanostructures.The advantages of carbon nanotubes,metal nanoparticles and molecular imprinting are combined in the preparation of sensors.The sensors can be used to detect many substances in the environment quickly,sensitively and selectively.The main research work of this thesis is as follows:1.In this chapter,the molecularly imprinted electrochemical sensor was successfully prepared on the surface of carbon paste electrode using sunset yellow sys as template molecule and acrylic acid as functional monomer by photopolymerization.The cyclic voltammetry(CV),electrochemical impedance technique(EIS)and differential pulse method(DPV)were used.The experimental results show that the imprinting sensor can recognize sy effectively.Under the optimal conditions,the current has a good linear relationship with its concentration.The molecularly imprinted modified electrode can be used for the detection of real samples.2.In this chapter,methyl parathion mp)as template molecule and tetraaminophenol p-atp as functional monomer were successfully prepared by electropolymerization of methyl parathion imprinted electrochemical sensor.The imprinting effect of the sensor was characterized by cyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS)and differential pulse method(DPV).The experimental results show that this MP molecular imprinted electrochemical sensor is feasible to detect MP.Under the optimal conditions.Finally,the recovery rate of MP in the water sample of the Yellow River is determined by using the sensor,and the effect is good.3.This chapter takes the dopamine(DA)as the template molecule,two benzene amine(OPD)as the functional monomer,using electro polymerization method to prepare a kind of dopamine(DA)Molecular Imprinted Electrochemical sensor.By means of cyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS)and differential method pulse method(DPV)method.The experimental results show that under the optimal conditions.The detection of molecular imprinting sensor of Da molecule is more sensitive.