Development of electrochemical sensor based on graphene oxide electrode modified by silver-doped ZNO nanorods for detection of carbamate pesticide in food

Abstract

A facile approach was used to develop a novel electrochemical sensor based on graphene oxide (GO)/ glassy carbon electrode (GCE) modified by silver (Ag)-doped ZnO nanorods for the determination of carbamate pesticides (CP). The electrochemical deposition technique was used to fabricate the proposed electrode, and scanning electron microscopy and energy dispersive X-ray spectroscopy were carried out to characterize the electrode surface morphology and determine the elements present in the sample, which confirmed the successful formation of Ag-doped ZnO nanorods. The electrochemical properties were considered by differential pulse voltammetry (DPV) and cyclic voltammetry. Due to the good conductivity and strong catalytic activity of Ag-doped ZnO nanorods, the developed sensor revealed a limit of detection as low as 0.34 nML-1 by DPV, indicating a good stability, acceptable reproducibility and selectivity and great potential in determination of CP compounds in foodstuffs.