Nickel oxide (NiO)/reduced graphene oxide (RGO) composite modified carbon paste electrode as an electrochemical sensor for the sensitive determination of dopamine

Abstract

A simple, nickel oxide/reduced graphene oxide composite modified carbon paste electrode (NiO/RGO-MCPE) was fabricated as an electrochemical sensor for the sensitive determination of Dopamine (DA). Hummers method and coprecipitation followed by reduction method were used for facile, simple and cost-effective preparation for the modifier graphite oxide and NiO/RGO composite respectively. The composite was characterized by using PXRD, FT-IR and TG-DSC. The greater surface area of NiO/RGO composite improves the performance towards DA. The NiO/RGO-MCPE possesses better electrochemical activity in Cyclic Voltammetry (CV) and Differential Pulse Voltammetry (DPV). The developed sensor shows good reproducibility, and stability. Detection limit of DA was determined from differential pulse voltammetry (DPV) and found to be 8.3 nM.