Preparation of Molecularly Imprinted Sensor for Determination of Omethoate Based on Carbon Nanotube Modified Electrode

KeyWord:molecular imprinting  omethoate  multi-walled carbon nanotube  sensor

Abstract:

      An electrochemical sensor for omethoate detection based on electropolymerized molecularly imprinted polymers£¨MIPs£© was fabricated.The sensitive layer was prepared by electropolymerizing o-phenylenediamine£¨OPD£© on a glassy carbon electrode modified with multi-walled carbon nanotube in the presence of template£¨omethoate£© which could be removed by ethanol.The electrochemical properties of the molecularly imprinted sensor were characterized by cyclic voltammetry and electrochemical impedance spectroscopy£¨EIS£©.The analytical characteristics of the sensor was investigated by differential pulse voltammetry, and an indirect analytical method based on the medium of K3Fe£¨CN£©6 was established.The result showed that a linear relationship between concentration of omethoate and relative peak current change of K3Fe£¨CN£©6 was obtained in the range of 1.0¡Á10-7-2.0¡Á10-6 mol/L, and the detection limit was 3.6¡Á10-8 mol/L.