One-pot synthesis rGO-NiO composites for highly sensitive room temperature NO2 gas sensor

In the present work, reduced graphene oxide (rGO)-NiO composite is prepared via a simple solvothermal method using NiCl₂ as precursors. Characterizations show that NiO particles have a nanosheet-based mesoporous structure and anchor uniformly on the surface of rGO nanoplates, and the BET surface area of NiO-rGO composites is 131.74m²/g, ~3.6 higher than that of pristine NiO nanoplates (36.58m²/g). For room temperature NO₂ gas sensors, the sensitivity of NiO is significantly improved after incorporation of graphene sheets.