Fabrication of non-enzymatic and highly sensitive electrochemical ascorbic acid sensor based on GO/Ag/PMMA nanocomposites

In the present study, Graphene Oxide-Silver-Poly(methyl methacrylate) (GO/Ag/PMMA) nanocomposites were fabricated and investigated for Ascorbic Acid sensing without using any enzyme. First, the graphene oxide was prepared by improved Hummers method. The tri-phase nanocomposites were also prepared by sonication and solution casting method with the ratio of Graphene Oxide (1, 2, 3, 4, and 5 %). The composites were characterized by FTIR, X-ray Diffraction (XRD), TGA, and scanning electron microscopy (SEM) analysis. The electrochemical studies/characterizations of ascorbic acid oxidation were carried out in the acidic medium and the new sensor was found to be a better electrochemical ascorbic acid sensor. The fabricated sensor is highly sensitive to ascorbic acid and shows its sensitivity (778.532 mu A mM- 1 cm- 2), it has a broad linear range (from 0.1 to 6 mM), it is selective, and it shows tolerance towards endogenous species such as glucose, uric acid, hydrogen peroxide, and dopamine.