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 x 10-7 - 2.0 x 10-6 mol/L, and the detection limit was 3.6 x 10-8 mol/L.
Template and target information: omethoate
Author keywords: molecular imprinting, Omethoate, multi-walled carbon nanotube, sensor