MoS2/PANI composite-based photoluminescence sensor for selective sensing of dimethoate pesticide

Abstract

This study explores the development of a sensitive and selective sensing nanocomposite for detecting a widely used organophosphate pesticide called dimethoate. It poses significant environmental and health risks due to its high toxicity and persistence in agricultural products. To address these concerns, we developed a novel MoS2 QDs/PANI nanocomposite and employed a photoluminescence technique to detect dimethoate. The MoS2 QDs/PANI nanocomposite was synthesized in a single-step process and characterized using XRD, UV–visible, photoluminescence (PL), TEM, and FTIR techniques. The nanocomposite demonstrated selective detection of dimethoate which is one among other pesticides. Utilizing the PL approach, the sensing nanocomposite achieved a detection limit (LOD) of 1 nM and a linear range (LR) of 1–30 nM. The relative standard deviation (RSD) for metal ion interference was 3 % and 5 % for actual raw samples, indicating that, the nanocomposite has high specificity and stability. Additionally, the sensing nanocomposite exhibited a 5 % RSD for repeatability, confirming its reliability. The sensing parameters of the MoS2/PANI nanocomposite were compared with existing literature, highlighting its superior performance. This novel nanocomposite offers a promising solution for effective and reliable dimethoate detection, contributing to improved food safety and environmental protection.