Abstract
AbstractClothianidin is an effective neonicotinoid insecticide and is harmful to human health. It is urgent to develop convenient analytical methods to determine clothianidin. In this study, a label‐free photoelectrochemical (PEC) sensor for clothianidin was proposed. A type‐II WO3/CdS heterojunction was prepared by chemical bath deposition method to enhance the photoelectric response. As a recognition element, the molecular imprinted polymer (MIP) film was formed on WO3/CdS by electropolymerization of o‐phenylenediamine functional monomer in the presence of clothianidin template. Owing to the high photoelectric conversion efficiency of WO3/CdS heterostructure and the specific recognition ability of MIP, the as‐prepared PEC sensor exhibits desirable analysis performance for clothianidin with high sensitivity and selectivity. This MIP‐PEC sensor offers a wide linear detection range from 1.0 nM to 5.0 μM with a detection limit of 0.4 nM. The proposed sensor combines the merits of MIP and semiconductor heterojunction, presenting a promising prospect in the field of analysis.
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