Nonenzymatic Glucose Sensor: Glassy Carbon Electrode Modified with Graphene-Nickel/Nickel Oxide Composite

Abstract

Graphene based sensors receive attention due to their enhanced surface area, unique two – dimensional structure, remarkable stability and excellent electrical conductivity. In the present work graphene-nickel/nickel oxide composite was prepared via solar exfoliation of graphite oxide/nickel acetate precursor. The morphology and structure of the as prepared composite has been characterized by transmission electron microscopy (TEM) & X-ray diffraction (XRD) techniques. The composite was used to modify the glassy carbon electrode surface. Its electrocatalytic activity for the oxidation of glucose in alkaline medium was investigated by cyclic voltammetry. The sensitivity and selectivity of the modified electrode towards glucose oxidation promises its effectiveness as a nonenzymatic glucose sensor for practical applications.