A highly selective electrochemical impedimetric sensor for imidacloprid determination based on WO <sub>3</sub> /MoS <sub>2</sub> nanosheets/molecularly imprinted polymer composite
Longhua Ding, Ya‐Wen Wang, Qiu-Wen Li, Lili Zhang, Aizhu Wang
Abstract
In this study, an electrochemical impedimetric sensor was established for imidacloprid (IMI) detection based on WO 3 /MoS 2 and molecular imprinted polymer (MIP) composite. MIP layer was prepared on electrode surface by electropolymerization of o‐phenylenediamine (o–PD) in the presence of IMI template, which ensured the specific recognization toward IMI. The electrochemical properties of fluorine‐doped Tin oxide (FTO)/WO 3 /MoS 2 /MIP electrode were studied via cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The prepared sensor exhibits low detection limit (0.1 μmol·L −1 ) with a wide concentration range from 0.5 to 70.0 μmol·L −1 . Moreover, this sensor shows high recoveries in real sample testing, revealing good application prospect.