Enhanced ammonia response of Ti3C2Tx nanosheets supported by TiO2 nanoparticles at room temperature

As a novel 2D material, Ti3C2Tx has been proved to be promising in the field of room temperature ammonia (NH3) sensors by theoretical calculation and experimental testing. However, its NH3 sensing properties still need to be enhanced. In this short communication, the gas sensor based on TiO2/Ti3C2Tx bilayer film is fabricated for enhancing the NH3 sensing properties of pure Ti3C2Tx. The results show that the TiO2/Ti3C2Tx sensor exhibits larger response value (1.63 times) and shorter response/recovery times (0.65/0.52 times) that of pure Ti3C2Tx sensor to 10 ppm NH3 at room temperature of 25 degrees C (60.8% relative humidity). Meanwhile, the TiO2/Ti3C2Tx sensor is of good linear response (R-2 = 0.95596) at 2-10 ppm NH3 and can respond to NH3 as low as 0.5 ppm. This work is expected to provide useful reference for the development of high performance Ti3C2Tx-based NH3 sensors.