Ce oxide nanoparticles on porous reduced graphene oxides for stable hydrogen detection in air/HMDSO environment

Abstract

A stable hydrogen detection strategy based on the highly dispersive cerium oxide (CeO2) nanoparticles/porous reduced graphene oxides (rGO) coated onto ZnO nanowires in air/Hexamethyldisiloxane (HMDSO) environment at 250 degrees C is described. The response (R-a/R-g = 5.88) of palladium-decorated ZnO sensor is deteriorated by the decrease of hydroxyl groups and the increase of oxygen vacancies occurring at the surface by the HMDSO. The chemical processes are strongly influenced by the oxygen supply by the CeO2 and the SiO2 layer is also thinner by the rGO layer. These make the sensor less sensitive to HMDSO exposure, demonstrating excellent long-term stability.