Preparation and Characterization of Fe2O3Nanoparticles by Solid-Phase Method and Its Hydrogen Peroxide Sensing Properties

Modified Fe 2 O 3 nanoparticles were obtained by a conventional solid-phase method with different additions of sodium lignosulfonate (SLS) and calcining temperatures. The microstructures and morphologies of the synthesized Fe 2 O 3 samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric/differential scanning calorimetry (TG/DSC) analysis, Fourier transform infrared spectroscopy (FT-IR) and surface area and porosity analyzer (BET). The results indicate that the fine Fe 2 O 3 particles with uniform morphology were gained (1.0 g SLS, calcined 400 °C). Then, the as-prepared Fe 2 O 3 nanoparticle, along with graphene (G), was immobilized on the surface of glassy carbon electrode (GCE) by a bridge constituted of chitosan (CS) for further electrochemical measurement of cyclic voltammetry and chronoamperometry. The prepared G-Fe 2 O 3 -CS/GCE with the above-mentioned fine Fe 2 O 3 particles (1.0 g SLS, calcined 400 °C) displayed high sensitivity (84.32 μA mM –1 cm –2 ), wide detection range (0.001–6.0 mM) and low detection limit (1.1 μM) when applied to the electrochemical sensing of hydrogen peroxide. Moreover, the sensor was also confirmed to exhibit good anti-interference for ascorbic acid and uric acid, excellent repeatability, and long-term stability.