Stable Aqueous Dispersion of Graphene Nanosheets: Noncovalent Functionalization by a Polymeric Reducing Agent and Their Subsequent Decoration with Ag Nanoparticles for Enzymeless Hydrogen Peroxide Detection

摘要: An aqueous dispersion of graphene nanosheets (GNs) has been successfully prepared via chemical reduction oxide (GO) by hydrazine hydrate in the presence poly[(2-ethyldimethylammonioethyl methacrylate ethyl sulfate)-co-(1-vinylpyrrolidone)] (PQ11), a cationic polyelectrolyte, for first time. The noncovalent functionalization GN PQ11 leads to that can be very stable several months without observation any floating or precipitated particles. Several analytical techniques including UV−vis spectroscopy, Raman X-ray diffraction (XRD), and photoelectron spectroscopy (XPS) have used characterize resulting GNs. Taking advantages fact is positively charged polymer exhibiting reducing ability, we further demonstrated subsequent decoration with Ag nanoparticles (AgNPs) two routes: (1) direct adsorption preformed, negatively AgNPs; (2) in-situ silver salts. It was found th...