Fe2O3 nanoplate/TiO2 nanoparticles supported by 2D Ti3C2Tx MXene conductive layers for sensitive detection of NH3 at room temperature

Ti3C2Tx MXene, a novel 2D material, has shown promise in the field of room temperature ammonia (NH3) sensors through theoretical calculations and experimental. However, the disadvantage of low response hinders its practical application. In this study, we fabricate a gas sensor based on Fe2O3 nanoplate/TiO2 nanoparticles supported by 2D Ti3C2Tx MXene to enhance NH3 sensing capabilities. Results reveal that the S2 sensor (with 3 ml FeCl3) exhibits a significantly larger response value (3.23 times) and shorter response/recovery times (62 s and 74 s) compared to the pure Ti3C2Tx MXene sensor when exposed to 100 ppm NH3 at room temperature (25℃). Additionally, the S2 sensor exhibits a good linear response (R2 = 0.95) within the range of 1-100 ppm NH3. The enhanced gas sensing properties can be mainly attributed to the Fe2O3/TiO2/Ti3C2Tx MXene heterogeneous structure and unique microstructure. This study is anticipated to serve as a valuable reference for the advancement of high-performance MXene-based NH3 sensors.