▎ 摘　　要

The optimum temperature for selective gas sensing using reduced graphene oxide depends on the reducing method of graphene oxide (GO). This work reveals that chemically reduced graphene oxide (CRGO) manifests selectivity at high temperature, while thermally reduced graphene oxide (TRGO) indicates gas selectivity at room temperature (RT). Both CRGO and TRGO are synthesized from the same GO source. Palladium nanoparticles were used to increase the catalytic activity of both the sensing surfaces. Hydrogen, carbon monoxide and methane gases were used for the sensor studies. The materials have been characterized to correlate the difference in properties with the selective sensing performance.