Flexible and high-sensitivity sensor based on Ti3C2–MoS2 MXene composite for the detection of toxic gases

Abstract

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 MoS₂ materials to create a Ti₃C₂–MoS₂ composite with high metallic conductivity and a wholly functionalized surface for a significant signal. At room temperature, the Ti₃C₂–MoS₂ composite demonstrated clear signals, cyclic response curves to NO₂ gas, and gas concentration-dependent. The sensitivities of the standard Ti₃C₂–MoS₂ (TM_2) composite (20 wt% MoS₂) rose dramatically to 35.8%, 63.4%, and 72.5% when increasing NO₂ 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.