A non-enzymatic electrochemical sensor based on NiCoSe2/rGO nanosheets for nanomolar range detection of Malathion

Abstract

Abstract Pesticide contamination in vegetables and fruits severely affects the quality of human life. This can be alleviated with a low cost and efficient sensor. Herein, we describe the synthesis of a NiCoSe2/rGO nano-composite sensor via hydrothermal method to detect Malathion. Scanning electron microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray diffraction (XRD), Fourier Transform IR spectroscopy (FT-IR) and X-ray Photoelectron Spectroscopy (XPS) did the material characteristics of nano-composite. The electrochemical activities of the nano-composite towards Malathion were investigated by Cyclic Voltammetry (CV), Electrochemical Impedance Spectroscopy (EIS), Differential Pulse Voltametry (DPV) and Chrono-amperometry (CA). The NiCoSe2/rGO nano-composite excellentlydetects Malathion and thus exhibiting its, excellent conductivity, electron transport and high surface area. The developed NiCoSe2/rGO sensor has a nano-molar range Limit of Detection (LOD) of Malathion with wide linear range from 64nM to 600 nM. Furthermore, the stability and effect of interfering species studies revealed the fact that interfering species could not make any significant current response in chrono-amperometry.