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It is vital to have high sensitivity in gas sensors to allow the exact detection of dangerous gases in the air and at room temperature. In this study, we used 2D MXenes and MoS 2 materials to create a Ti 3 C 2 -MoS 2 composite with high metallic conductivity and a wholly functionalized surface for a significant signal. At room temperature, the Ti 3 C 2 -MoS 2 composite demonstrated clear signals, cyclic response curves to NO 2 gas, and gas concentration-dependent. The sensitivities of the standard Ti 3 C 2 -MoS 2 (TM_2) composite (20 wt% MoS 2 ) rose dramatically to 35.8%, 63.4%, and 72.5% when increasing NO 2 concentrations to 10 ppm, 50 ppm, and 100 ppm, respectively. In addition, the composite showed reaction signals to additional hazardous gases, such as ammonia and methane. Our findings suggest that highly functionalized metallic sensing channels could be used to construct multigas-detecting sensors that are very sensitive in air and at room temperature., (Copyright © 2021 Elsevier Ltd. All rights reserved.)