Synthesis of graphene nanosheets with incorporated silver nanoparticles for enzymeless hydrogen peroxide detection
Herein, we report on the production of poly(diallydimethylammonium chloride) (PDDA) functionalized reduced graphene oxide (PDDA-rGO) with the use of PDDA as a reducing and stabilizing agent. Atomic force microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy were used to characterize the resulting PDDA-rGO nanosheets. The PDDA-rGO nanosheets could be modified with Ag nanoparticles (AgNPs) by direct adsorption of preformed, negatively charged AgNPs. It was found that the AgNPs were distributed uniformly on the PDDA-rGO nanosheets and the obtained PDDA-rGO/AgNPs nanocomposites exhibited prominent electrocatalytic activity for the detection of hydrogen peroxide (H2O2) with a wide linear range from 100 μM to 41 mM (r = 0.997) and a rapid response upon the addition of H2O2. The detection limit was estimated to be 35 μM. Furthermore, the fabricated nonenzymatic H2O2 electrochemical sensor demonstrated excellent stability and reproducibility.