Target-assisted self-powered photoelectrochemical sensor based on Ag2S/BiOCl heterojunction for ultrasensitive chlorpyrifos detection

作者：Ke Yin, Jin Zhang, Yadong Xue, Ai‐Jun Wang, Li-Ping Mei, Pei Song, Jiu‐Ju Feng · 发表于：Talanta · 年份：2024 · DOI：10.1016/j.talanta.2024.127502 · 被引用次数：14 · 研究领域：Advanced biosensing and bioanalysis techniques、Advanced Nanomaterials in Catalysis、Molecular Sensors and Ion Detection

Chlorpyrifos (CPF), a widely used organophosphorus pesticide , presents substantial risks to both environmental and human health due to its persistent accumulation, thereby necessitating the development of effective detection methods. Self-powered photoelectrochemical (PEC) sensors, as an innovative technology, address the limitations inherent in conventional sensors, such as susceptibility to interference and inadequate signal response. Herein, we synthesized Ag 2 S/BiOCl as a photosensitive material, employing it as a light-harvesting substrate and a signal-transducing platform to develop a self-powered PEC sensor for the detection of CPF. Ag 2 S/BiOCl composite exhibited a markedly enhanced photocurrent response in comparison to either Ag 2 S or BiOCl individually. CPF possesses distinctive chemical bonds, and upon incubation on the electrode surface, it forms chelates with Bi (III) within the Ag 2 S/BiOCl heterojunction . This interaction effectively impedes the transfer of photogenerated charges, resulting in a pronounced decrease in the original PEC signal, thereby facilitating the rapid and sensitive detection of CPF. This self-powder PEC sensor exhibited excellent linearity over the concentration range of 10.0 pg mL −1 –100.0 ng mL −1 , with a detection limit of 1.5 pg mL −1 . The successful application of this work in real samples highlights its strong potential for monitoring of CPF residues, while also demonstrating its broader applicability for detecting other con...