Methyl Parathion Detection Using SnS₂/N, S–Co-Doped Reduced Graphene Oxide Nanocomposite

The rapid and ultralow detection of toxic organophosphate chemicals is a well-known, important step to reduce adverse health issues and yet also remains challenging. Here, we show electrochemical detection of methyl parathion (MP) using SnS₂ nanosheets supported in a N, S-codoped reduced graphene oxide nanocomposite (SnS₂/NS–RGO) in a neutral medium. The SnS₂/NS–RGO is obtained by one-pot hydrothermal synthesis and modified onto a glassy carbon electrode (GCE) for electrochemical MP detection ability. The effects of SnS₂ in NS–RGO showed a substantial reduction in the electron resistivity and increase in the acceleration of electron mobility. The cyclic voltammetry investigation of SnS₂/NS–RGO to the MP detection showed a superior electrochemical detection property, while unmodified GCE, SnS₂, and NS–RGO yielded unsatisfactory results. Thus, the SnS₂/NS–RGO showed the best performance in terms of the sensitivity (4.033 μA μM^–1 cm^–2), limit of detection (0.17 nM), accuracy, and stability. In practical detection, the SnS₂/NS–RGO sensing retained satisfactory recovery of MP added in river water and black grape samples.