Abstract
Real-time sensing of hydrogen sulfide (H(2)S) at room temperature is important to ensure the safety of humans and the environment. Four kinds of different nanocomposites, such as MXene Ti(3)C(2)T(x), Ti(3)AlC(2), WS(2), and MoSe(2)/NiCo(2)O(4), were synthesized using the hydrothermal method in this paper. Initially, the intrinsic properties of the synthesized nanocomposites were studied using different techniques. P-type butane and H(2)S-sensing behaviors of nanocomposites were performed and analyzed deeply. Four sensor sheets were fabricated using a spin-coating method. The gas sensor was distinctly part of the chemiresistor class. The MXene Ti(3)C(2)T(x)/NiCo(2)O(4)-based gas sensor detected the highest response (16) toward 10 ppm H(2)S at room temperature. In comparison, the sensor detected the highest response (9.8) toward 4000 ppm butane at 90 °C compared with the other three fabricated sensors (Ti(3)AlC(2), WS(2), and MoSe(2)/NiCo(2)O(4)). The MXene Ti(3)C(2)T(x)/NiCo(2)O(4) sensor showed excellent responses, minimum limits of detection (0.1 ppm H(2)S and 5 ppm butane), long-term stability, and good reproducibility compared with the other fabricated sensors. The highest sensing properties toward H(2)S and butane were accredited to p-p heterojunctions, higher BET surface areas, increased oxygen species, etc. These simply synthesized nanocomposites and fabricated sensors present a novel method for tracing H(2)S and butane at the lowest concentration to prevent different gas-exposure-related diseases.