▎ 摘　　要

In this work, gas sensors based on chemically reduced graphene oxide (rGO) foams were reported for NH3 detection. Polymer foams were used as scaffolds to support rGO, and the resultant soft sensing devices exhibited a high sensitivity, high selectivity, and rapid recovery for NH3 detection at room temperature. The sensor showed more than 0.90% and 3.67% resistance changes respectively, when it's exposed to 1 ppm and 50 ppm NH3. The graphene foam gas sensors (FGS) also showed excellent repeatability. Furthermore, the response of rGO foam gas sensor to NH3 was more than two times higher than that to methanol vapors diluted to 1% of the saturated vapor concentration. Above all, the unique features, such as simple preparation, low cost and energy consumption, as well as excellent sensing performance, endow the sensor a great potential for NH3 detection.