A highly sensitive nonenzymatic hydrogen peroxide (H2O2) sensor was fabricated using platinum nanoparticles decorated reduced graphene oxide (Pt/rGO) nanocomposite. The Pt/rGO nanocomposite was prepared by single-step chemical reduction method. Nanocomposite was characterized by various analytical techniques including Raman spectroscopy, X-ray diffraction, field emission scanning electron microscope and high-resolution transmission electron microscopy. Screen printed electrodes (SPEs) were fabricated and the nanocomposite was cast on the working area of the SPE. Cyclic voltammetry and amperometry demonstrated that the Pt/rGO/SPE displayed much higher electrocatalytic activity towards the reduction of H2O2 than the other modified electrodes. The sensor exhibited wide linear detection range (from 10 M to 8 mM), very high sensitivity of 1848 A mM1 cm2 and a lower limit of detection of 0.06 M. The excellent performance of Pt/rGO/SPE sensor were attributed to the reduced graphene oxide being used as an effective matrix to load a number of Pt nanoparticles and the synergistic amplification effect of the two kinds of nanomaterials. Moreover, the sensor showed remarkable features such as good reproducibility, repeatability, long-term stability, and selectivity.
Keerthy Dhara, T. Ramachandran, Dr. Bipin G. Nair, and Dr. Satheesh Babu T. G., “Fabrication of Highly Sensitive Nonenzymatic Electrochemical H2O2 Sensor Based on Pt Nanoparticles Anchored Reduced Graphene Oxide”, Journal of Nanoscience and Nanotechnology, vol. 18, pp. 4380-4386, 2018.