LAUSR

Spinel NiCo2O4 material has received considerable attention as an excellent gas sensing material. In this study, we report facile and hydrothermal method synthesis for preparing mesoporous NiCo2O4 and its composite with reduced graphene oxide (rGO) by wet impregnation method. The as-prepared samples were subjected to structural and morphological investigations. The constructed NiCo2O4-rGO composite gas sensor shows superior NH3 gas sensing performance at room temperature and the response for 100 ppm NH3 is 1.068 at room temperature. Moreover, this sensor shows better gas sensing performances with fast response times, recovery times, and good repeatability for a test period of 10 cycles along with high selectivity for NH3 gas sensor. Thus, NiCo2O4-rGO composite may be used as an efficient NH3 gas sensor. The sensing mechanism of the NiCo2O4-rGO composite sensors has also been proposed in this paper.