▎ 摘　　要

A novel ethanol gas sensor constructed with SnO2 nanoparticles doped with palladium and graphene is described. By incorporating 0.1 wt% graphene and 3 wt% PdCl2 into SnO2, the working temperature of the sensor can be reduced to 40 degrees C and the response is 4.6. The operation temperature can be decreased to near room temperature due to the increased oxygen adsorption by palladium and the high electron mobility by graphene.