Highly sensitive MXene-based SO2 sensor enhanced by modification of SnO2 at room temperature

High-performance and room-temperature gas sensors are ideal for industrial production and environmental detection. Enhancing gas-detection capability by the use of highly conductive MXene in conjunction with metal oxide materials is a potential approach. In this work, we have prepared a gas-sensing composite device based on SnO 2 /V 2 CT x nanocomposites, which can be used to detect the concentration of SO 2 gas at room temperature (~ 20 ℃). This paper modified two-dimensional (2D) V 2 CT x MXene with SnO 2 nanoparticles by electrostatic binding method to synthesize SnO 2 /V 2 CT x composite nanomaterials. The experimental results show that at room temperature, the addition of SnO 2 nanoparticles can markedly improve the gas-sensing response (from 66 to 83%) characteristics of pure V 2 CT x to SO 2 . The gas sensitivity of SnO 2 /V 2 CT x MXene nanocomposites can reach 83%, and its response/recovery time is 98 s/81 s under 10 ppm SO 2 . The gas-sensing composite devices made of SnO 2 /V 2 CT x composite nanomaterials also show good selectivity and application prospects.