Electrochemical sensor based on Ni/reduced graphene oxide nanohybrids for selective detection of ascorbic acid

Abstract

Nowadays, graphene is integrated with different nanomaterials to form unique composite materials. Decorating the surface of graphene sheets with Ni nanoparticles (Ni NPs) is one of the popular methods. In this paper, a newly advanced electrochemical sensor based on the nanohybrid of graphene oxide modified with Ni NPs was developed with a facile and effective one-pot solvothermal strategy, which was synthesized by using hydrothermal method and followed calcining under Ar flow. The as-prepared composites were characterized via X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), infrared spectrometry, and voltammetric methods. The results reveal that Ni/reduced graphene oxide (rGO) composite exhibit remarkable electrocatalytic performance toward detecting ascorbic acid (AA). After calcination in the argon gas at 450 °C, as-synthesized Ni/rGO has uniform particle size distribution with the average particle size of 10 nm. The corresponding line arrange and detection limit are estimated to be from 0.01 mM to 1.15 mM (r = 0.99919) and 0.61μM at a signal-to-noise ratio of 3.