Detection of Dimethoate Pesticide using rGO/PDAC modified silver Needle Electrodes

Dimethoate (DMT) pesticides concentration is increasing in the environment due to the uncontrolled use in agriculture. This affects directly the environment and is of high risk for public health. For in-situ monitoring, a needle electrode based sensor has been developed for direct use in environmental and food security applications. Needle can easily penetrate fruits and vegetables. We demonstrated the feasibility of using silver needle/poly(diallyldimethylammonium chloride) (PDAC)/ reduced graphene oxide (Ag/PDAC/rGO) for detection of DMT pesticide. The functionalization of the silver needle was carried out by dip coating in PDAC and an electrochemical deposition method was employed to deposit and reduce graphene oxide on the needle tip surface. The modified needle electrode has been characterized at different levels of modification by scanning electron microscopy (SEM) showing a successful functionalization. Furthermore, electrochemical characterizations by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) show a good sensitivity.