Synthesis of Ag Nanoparticles Dispersed on Co3O4–3D Porous Reduced Graphene Oxide and their Application for Electrochemical Sensing of Hydrogen Peroxide

Abstract

Ag nanoparticles dispersed on Co3O4/3D porous reduced graphene oxide (Ag/Co3O4/rGO) were successfully synthesized through sol–gel method and used for fabricating a novel nonenzymatic hydrogen peroxide (H2O[Formula: see text] sensor. The structure and morphology of anocomposites were characterized by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The electrochemical properties of the sensor were investigated by cyclic voltammetry and amperometry. The experimental results suggest that the composites have an excellent catalytic property toward dopamine with a wide linear range from 0.5[Formula: see text][Formula: see text]M–6.48[Formula: see text]mM, a low detection limit of 0.17[Formula: see text][Formula: see text]M ([Formula: see text]) and high sensitivity of 413.72[Formula: see text][Formula: see text]A[Formula: see text]mM[Formula: see text] cm[Formula: see text]. In addition, the sensor exhibits long-term stability, good reproducibility and anti-interference.