Responsive photoactive probe based photoelectrochemical sensor for sulfur dioxide
Yingying Zhang, Yuanqiang Hao, Ying Peng, Xiaobing Wang, Yanli Zhou, Shu Chen, Maotian Xu
Abstract
Abstract This study introduces a novel photoelectrochemical (PEC) sensor for the highly selective detection of sulfur dioxide (SO 2 ) using an organic photoactive molecule probe (OPM). OPM is synthesized through a one‐step coupling reaction, featuring a typical photosensitizer D‐π‐A structure. By covalently bonding OPM with a TiO 2 substrate, a PEC sensor is constructed, exhibiting a significant photocurrent response under visible light excitation. The specific addition reaction between SO 2 and OPM disrupts its conjugated structure, reducing the photocurrent response and achieving highly selective detection of SO 2 . The sensor demonstrates excellent performance in real water samples, emphasizing its practical applications.