Enhanced nonenzymatic hydrogen peroxide sensing with reduced graphene oxide/ferroferric oxide nanocomposites

A nonenzymatic hydrogen peroxide (H2O2) sensor was fabricated using the reduced graphene oxide (RGO) and ferroferric oxide (Fe3O4) nanocomposites as the sensing material. The nanocomposites were synthesized by coprecipitation method and characterized by high-resolution transmission electron microscopy and X-ray diffraction. Results showed that the RGO sheet was evenly decorated by the well-crystallized Fe3O4 nanoparticles. The nanocomposites showed enhanced catalytic ability to the reduction of hydrogen peroxide compared with the RGO, Fe3O4 nanoparticles alone and the mixture materials. The sensor has a quite wide linear range from 0.1 mM to 6 mM (R2 = 0.990) with less than 5 s response time. Moreover, its detection limit is 3.2 μM (S/N = 3). The anti-interference ability, long-term stability and potential application in real samples of the sensor is also assessed. This work expands the application of the graphene-based nanomaterials in the sensor areas.