Functionalized graphene oxide–polypyrrole–chitosan (fGO–PPy–CS) modified screen-printed electrodes for non-enzymatic hydrogen peroxide detection

Functionalized graphene oxide (fGO) was synthesized and subsequently used for synthesis of nanocomposite with polypyrrole (PPy) and chitosan (CS) to give fGO–PPy–CS nanocomposites. Screen-printed carbon electrodes were then modified with these nanocomposites to construct an unprecedented hydrogen peroxide (H2O2) sensor. Cyclic voltammetry (CV) and amperometric response demonstrated that the composite materials hold potential for electrocataytic reduction towards H2O2. Under optimal experimental conditions, the amperometric response of the fGO–PPy–CS sensor was linearly proportional to H2O2 in the range of 2.5–200 μM with a detection limit of 1.95 μM (S/N = 3). The present study provides new opportunities for fGO–PPy–CS-modified electrodes to probe the improved non-enzymatic detection of H2O2. It further broadens the applications of graphene-based conducting composites in the field of sensors and biosensors for diverse applications.