Oxygen vacancy engineering for enhanced sensing performances: A case of SnO2 nanoparticles-reduced graphene oxide hybrids for ultrasensitive ppb-level room-temperature NO2 sensing

In this paper, SnO2 nanoparticles (NPs) decorated reduced graphene oxide hybrids with abundant vacancies (designated as SnO2-RGO-OVs) have been successfully prepared by a combined hydrothermal synthesis and chemical solution deposition method. It is found that high density SnO2 NPs with the size of 3–5 nm are uniformly distributed on the surface of RGO nanosheets. Most importantly, SnO2-RGO-OVs hybrids exhibit excellent room-temperature NO2...