Publication

Abstract : A highly sensitive nonenzymatic hydrogen peroxide (H2O2) sensor was fabricated using palladium nanoparticles decorated reduced graphene oxide (Pd/rGO) nanocomposite. The Pd/rGO nanocomposite was prepared by single-step chemical reduction method. Nanocomposite was characterized by Raman spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and high-resolution transmission electron microscopy (HRTEM). Screen printed electrodes (SPE) were fabricated, and the Pd/rGO nanocomposite was cast on the working electrode of the SPE. The Pd/rGO/SPE was electrochemically characterized by linear sweep voltammetry (LSV) and amperometry. The sensor exhibited extremely high electrocatalytic activity to H2O2 in neutral medium (pH = 7.4) with a wide linear range (from 10 μM to 4 mM), and very high sensitivity of 2104 μA mM–1 cm–2. The lower limit of detection found to be 0.5 μM. The Pd/rGO/SPE sensor demonstrated excellent features such as good reproducibility, long-term stability, and selectivity.