High Performance HS Sensor Based on Ordered FeO/TiC Nanostructure at Room Temperature.

The utilization of a heterogeneous nanojunction design has shown significant enhancements in the gas sensing capabilities of traditional metal oxide gas sensors. In this study, a novel room temperature HS gas sensor employing FeO functionalized TiC MXene as the sensing material has been developed. This sensor exhibits a broad detection range (0.01-500 ppm), low detection limit (10 ppb), and rapid response/recovery times (10 s/15 s), making it ideal for ppb-level HS detection. The exceptional gas sensitivity of FeO/TiC composite to HS can be attributed to several key factors. First, the unique layered frame structure of FeO/TiC significantly amplifies the surface area of the hybrid material, enhancing the absorption and diffusion capabilities of HS molecules. Second, the abundance of functional groups (-O, -OH, and -F) on the surface of TiC MXene nanosheets provides additional active sites for HS adsorption, The density functional theory calculation confirms that the adsorption energy of the FeO/TiC composite for HS (-2.93 eV) is significantly lower than that of pure FeO (-2.37 eV) and TiC (-0.2 eV). Lastly, the remarkable metal conductivity of TiC MXene ensures efficient electron transfer, thereby enhancing overall sensing performance.