Reduced graphene oxide/polydopamine/gold electrode as elecrochemical sensor for simultaneous determination of ascorbic acid, dopamine, and uric acid

Abstract

In this paper, the reduced graphene oxide/polydopamine (RGO/PDA) nanocomposites are obtained via the reduction of GO nanosheets by dopamine, followed by simultaneous modify by PDA. Then Au nanoparticles (NPs) decorated RGO/PDA (RGO/PDA/Au) nanocatalyst was synthesized via in situ reduction. The obtained RGO/PDA/Au nanocatalyst is analyzed by transmission electron microscopy (TEM) and electrochemical measurements. It is found that RGO/PDA/Au nanocatalyst exhibits good electrochemical catalytic activity can be detect AA, DA and UA individual and simultaneous. The detection limit of AA, DA and UA are 1.64 mM, 0.11 mM, 0.13 mM, respectively. The prepared RGO/PDA/Au nanocatalyst possesses a large surface area, unique biocompatibility and excellent conductivity will benefit for the electrocatalytic oxidation of AA, DA and UA.