Sensing hydrogen peroxide with a glassy carbon electrode modified with silver nanoparticles, AlOOH and reduced graphene oxide

A nanocomposite consisting of silver nanoparticles (AgNPs), AlOOH and reduced graphene oxide (rGO) was prepared where gamma-AlOOH was employed to modify rGO to obtain a platform for the growth of dispersed AgNPs. A glassy carbon electrode was modified with the nanocomposite in a chitosan matrix to obtain a nonenzymatic sensor for H2O2 with a working voltage of typically -0.3 V (vs. Ag/AgCl). The morphology and composition of the nanocomposites were characterized by transmission electron microscopy, Raman spectra, X-ray spectrometer and X-ray diffraction. Cyclic voltammetry revealed a wide linear range (5.0 mu M to 4.2 mM), a sensitivity of 115.4 mu A center dot mM(-1) center dot cm(-2) and a low detection limit (1.8 mu M).