Photoinduced Electron Transfer-Triggered g-C3N4\Rhodamine B Sensing System for the Ratiometric Fluorescence Quantitation of Carbendazim

作者：Qianru Zhang, Zhong Zhang, Shihao Xu, Anqi Liu, Liangguo Da, Dan Lin, Changlong Jiang · 发表于：Analytical Chemistry · 年份：2023 · DOI：10.1021/acs.analchem.2c05691 · 被引用次数：33 · 研究领域：Carbon and Quantum Dots Applications、Electrochemical sensors and biosensors、Sulfur Compounds in Biology

Assays for carbendazim (Car) with high sensitivity and on-site screening have been urgently required to protect the ecosystem and prevent disease. In this work, a simple, sensitive, and reliable sensing system based on photoinduced electron transfer was established to detect carbendazim utilizing ultrathin graphitic carbon nitride (g-C 3 N 4 ) nanosheets and rhodamine B (RB). Carbendazim reacts with g-C 3 N 4 by electrostatic interactions to form π–π stacking, and the quenching of the blue fluorescence is caused by electron transfer. While RB works as a reference fluorescence sensor without any fluorescence change, leading to obvious ratiometric fluorescence variation from blue to purple. Under optimal conditions, a favorable linear range from 20 to 180 nM was obtained, with a low detection limit of 5.89 nM. In addition, a portable smartphone sensing platform was successfully used for carbendazim detection in real samples with excellent anti-interference capability, demonstrating the potential applications of carbendazim monitoring.