Non-enzymatic glucose sensing platform using self assembled cobalt oxide/graphene nanocomposites immobilized graphite modified electrode

A new strategy to prepare the densely packed cobalt oxide (Co3O4)/graphene nanocomposites by a self-assembly method were adopted in this work. A new non-enzymatic glucose determination has been fabricated by using Co3O4/graphene nanocomposites modified electrode as a sensing material. The nanocomposites were characterized using X-ray diffraction, X-ray photoelectron spectroscopy and field emission scanning electron microscopy, which confirms the successful formation of dense packed Co3O4/graphene nanocomposite. The results of Co3O4/graphene nanocomposites modified electrode exhibit good electrocatalytic activity toward the oxidation of glucose in 0.1 M NaOH by cyclic voltammetry. Under optimal conditions, the oxidation peak current was proportional to the glucose concentration in the range from 16.0 A mu M to 1.3 mM with a detection limit of 0.5 A mu M. The determination of glucose with the modified electrode shows the advantages of ease of preparation, high sensitivity and good stability. The analytical utility of the modified electrode as an amperometric sensor for the determination of glucose in the flow systems was evaluated by chronoamperometric studies. The practical application of the modified electrode for glucose determination has been evaluated in urine samples.