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.

尖晶石NiCo ₂ O ₄材料作为一种出色的气体传感材料受到了广泛的关注。在这项研究中，我们报道了湿法浸渍法制备水热法合成介孔NiCo ₂ O ₄及其与还原氧化石墨烯（rGO）的复合材料。对所制备的样品进行结构和形态研究。构造的NiCo ₂ O ₄ -rGO复合气体传感器在室温下显示出卓越的NH ₃气体感测性能，并且对100 ppm NH ₃的响应在室温下为1.068。此外，此传感器显示出更好的气体感测性能，具有响应时间短，恢复时间短，在10个循环的测试周期内具有良好的可重复性以及对NH ₃气体传感器的高选择性。因此，NiCo ₂ O ₄ -rGO复合材料可用作有效的NH ₃气体传感器。本文还提出了NiCo ₂ O ₄ -rGO复合传感器的传感机制。