▎ 摘　　要

Owing to its unprecedented structural, electronic and mechanical properties, graphene, a single-atomic sheet of carbon atoms, is effectively used to detect chemical species. In this work, adsorption of gaseous molecules, mainly toxic (NO2, NO, NH3, CO, CO2, HF, H2S, etc.) and volatile organic compounds (VOCs), on graphene and modified graphene (GO, rGO) has been reviewed. The gas sensing ability of graphene is enhanced by doping with heteroatoms, and functionalizing it with many groups, such as hydroxyl, epoxy, etc. Recent advances in detection of gaseous molecules by graphene and modified graphene, coupled with metal and metal oxide nanoparticles, which have high response and better sensitivity than metal and metal oxide NPs because of high surface area and increased electronic charge transfer, have also been reported.