the newly proposed siligraphene with graphene-like honeycomblattice after the uniform introduction of Si atoms has shown greatpotential in optoelectronic applications [25,27e29]. Here, by density functional calculation and simulations, we predict that thestable SiC5 siligraphene (g-SiC5) is promising as gas sensor withgood selectivity and sensitivity for some specific air pollutants likeNO, HCHO and SO2