▎ 摘　　要

In this study, polyaniline-reduced graphene oxide (PANI-rGO) nanocomposite films were used as sensitive membranes in NH3 gas sensors operated at room temperature (300 K). The responsivity and response speed of the PANI-rGO NH3 gas sensors were improved by homogeneously distributing PANI nanospheres on both surfaces of rGO nanosheets. The optimal weight ratio was 125 which was obtained by changing the weight ratio of PANI/rGO in the NH3 gas sensors. The NH3 gas sensors based on rGO and PANI sensitivity membranes had responsivities of 0.5% and 8.3%, whereas the recovery times were 8.0 and 48.0 min, respectively. The optimal responsivity and recovery time of these PANI-rGO NH3 gas sensors operated at room temperature under a 15-ppm NH3 gas environment were 13.0% and 22.1 min, respectively. However, because the responsivity of a rGO sensing membrane was considerably less than that of a PANI sensing membrane, the responsivity of the PANI-rGO NH3 gas sensors was reduced by incorporating more rGO content. The lowest detectable NH3 gas concentration of the PANI-rGO NH3 gas sensors was 0.3 ppm. (C) 2019 Elsevier B.V. All rights reserved.