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

Abstract

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.

Graphical abstract

The present study provides new opportunities for fGO–PPy–CS-modified electrodes to probe the improved non-enzymatic detection of H₂O₂.

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