Gas sensing materials essentially dominate the performances of the gas sensors which are
widely applied in environmental monitoring, industrial production and medical diagnosis. However,
most of the traditional gas sensing materials show excellent performances only at high operating
temperatures, which are high energy consumptive and have potential issues in terms of reliability
and safety of the sensors. Therefore, the development of Room Temperature (RT) gas sensing materials
becomes a research hotspot in this field. In recent years, graphene-based materials have been
studied as a class of promising RT gas sensing materials because graphene has a unique twodimensional
(2D) structure with high electron mobility and superior feasibility of assembling with
other “guest components” (mainly small organic molecules, macromolecules and nanoparticles).
More interestingly, its electrical properties become even more sensitive toward gas molecules at RT
after surface modification. In this review, we have summarized the recently reported graphenebased
RT gas sensing materials for the detection of NO<sub>2</sub>, H<sub>2</sub>S, NH<sub>3</sub>, CO<sub>2</sub>, CO, SO<sub>2</sub>, Volatile Organic
Compounds (VOCs) (i.e. formaldehyde, acetone, toluene, ethanol), as well as Liquefied Petroleum
Gas (LPG) and highlighted the latest researches with respect to supramolecular modification of graphene
for gas sensing. The corresponding structural features and gas sensing mechanisms of the
graphene-based gas sensors have also been generalized.
Preparation and Gas Sensing Properties of PANI/SnO2 Hybrid Material
