▎ 摘　　要

NOVELTY - The utility model claims a gas sensor, comprising a ceramic substrate, a graphene layer of the ceramic substrate surface a pair of comb-shaped electrodes and is covered on the surface of the ceramic substrate between the comb electrodes and the comb-shaped electrode; the graphene layer of the impurity molecules in air suction sensor in the environment changes its own resistance property, so that the electrical parameter of said comb electrode is changed so as to obtain the proportion of impurities in the air, the sensor further comprises a heating unit arranged at the bottom of the ceramic substrate. desorption process impurity molecules in the heating unit heating the ceramic substrate when working, so that the graphene layer temperature increases, the adsorbed on the graphene layer is increased. performing a gas sensor of the utility model has the following beneficial effects: the high sensitivity and easy desorption.