MXene-derived TiO2 nanosheets decorated with Ag nanoparticles for highly sensitive detection of ammonia at room temperature

•A novel AgNPS-anchored Ti3C2Tx MXene–derived TiO2 nanocomposite is fabricated for high-precision gas sensors.•The Ag@TiO2 gas sensor exhibited a response value of 71.8 to 50 ppm NH3 at room temperature with a detection limit of 5 ppm.•Enhanced NH3 sensing response mechanism of the Ag@TiO2 nanocomposite is discussed.