Construction of graphene-based modified electrochemical sensor by electropolymerization

This paper reported a graphene (GNE)-based integrated planar electrochemical microsensor array fabricated by electropolymerization. Compared with conventional drop-coating method, the optimized single-step electropolymerization was introduced by incorporating anodic dopant GNEs into polypyrrole film (denoted as PPy/GNEs). The Raman spectroscopy and images of SEM showed the distribution of PPy and GNEs on the surface of electrode. For the PPy/GNEs modified electrode, the cyclic voltammetry (CV) curve has great electrochemical response, high sensitivity and superior reproducibility. The relationship between its peak current and square root of scan rate is linear with a fitting slope of 15.6416 and an adjusted R-square (R²) of 0.9919. As an application, the PPy/GNEs modified electrode has a strong electrocatalysis for hydrogen peroxide.