A novel nonenzymatic hydrogen peroxide sensor based on the synthesized mesoporous carbon and silver nanoparticles nanohybrid

Here, we report the synthesis and characterization of a novel nanohybrid composed of mesoporous carbon and silver nanoparticles (MC/AgNPs) to use in amperometric sensing of hydrogen peroxide (H2O2). In this process, the MC was synthesized by using the mesoporous silica as a template and glucose as a carbon source. The AgNPs were produced by in situ chemical reduction of silver nitrate through glucose as a reducing and stabilizing agent in the presence of MC to give the desired MC/AgNPs nanohybrid. It was investigated by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and electrochemical measurements. The obtained nanohybrid was used to modify a glassy carbon electrode and to fabricate an amperometric sensor for H2O2 determination at a working potential of -200 mV vs. silver/silver chloride electrode in aqueous 0.1 M phosphate buffer solution (pH 7.0). The resulted sensor can detect H 2O2 in the concentration range of 0.1-41 μM with a detection of limit 50 nM at a signal-to-noise ratio of 3. © 2014 Elsevier B.V.