Fabrication of SnO2-TiO2-Ti3C2Tx hybrids with multiple-type heterojunctions for enhanced gas sensing performance at room temperature

The development of high-performance chemiresistive gas sensors at room temperature is necessary and challenging for practical environmental monitoring industrial production controlling. Combining MXene (two-dimensional transition metal carbide) with SMO (semiconductor oxide) a promising strategy to enhance room-temperature sensing performance. However, there are few studies on the integration multiphase composites. Herein, we fabricate SnO2-TiO2-Ti3C2Tx heterostructure sensor, which exhibits high sensitivity, low detection limit, excellent selectivity, long-term stability NO2 25 °C. Compared SnO2, Ti3C2Tx, TiO2-Ti3C2Tx sensors, significantly improved performance sensor attributed synergic effects three phases, not only forms functionalized surfaces increased adsorption, more importantly, produces multiple-type heterojunctions SnO2/TiO2 TiO2/Ti3C2Tx interfaces because suitable energy band structures among resulting in enhanced electrical transduction function sensor. This work sheds new avenue improve by coupling multiple types SMO-MXene hybrid