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

Nanoscale Ag-Decorated Hollow Porous CuO/SnO2 Heterojunctions for Isopropanol Detection

“…The gas-sensing mechanism of MOS sensors depend highly on the modulation of the electron-depletion layer (EDL) or hole-accumulation layer (HAL) by oxygen molecules or target gas adsorption/desorption on the sensors surface. − For an n-type semiconductor, electrons from the conduction band can react with the oxygen molecules to generate oxygen anions (O – , O 2– or O 2 – ) . This process forms an EDL on the SnO 2 surface (Figure a), thereby increasing the resistance ( R a ) of the SnO 2 sensor in air.…”

Room-temperature chemiresistive ammonia sensors based on 2D MXenes and their hybrids: recent developments and future prospects

“…The reported sensor response of this composite was 67% at 1 ppm LOD, which was quite efficient. [62][63][64][65][66][67][68][69][70][71][72][73][74][75][76] TiO 2 was synthesized using an in situ route on the surface and inner layer of MXene to create a MXene-TiO 2 junction, by Hou et al 73 A response value of 56.9% towards 100 ppm NH 3 at ambient temperature was obtained from the Ti 3 C 2 T x -TiO 2 -CuO composite known as TTC-1, as shown in Fig. 4(h).…”

Self-Powered Wearable Gas Sensors Based on l-Ascorbate-Treated MXene Nanosheets and SnO2 Nanofibers

“…4 The interfacial engineering led to the formation of heterojunctions that increases the specific surface area resulting in improved gas adsorption and transduction function for gas sensors 20 and has been reported for the SnO 2 −TiO 2 − Ti 3 C 2 T x sensor, where 18 and 2.5 times higher sensitivity is observed toward NO 2 in comparison to Ti 3 C 2 T x and TiO 2 − Ti 3 C 2 T x , respectively. 21 Similarly, the W 18 O 49 /Ti 3 C 2 T X composite-based sensor exhibit a high response of 11.6 toward 20 ppm acetone at RT. 22 Recently, we have reported MXene modulated SnO 2 gas sensors toward sub-ppb level NO 2 at RT with excellent reversibility and fivefold response in comparison to pristine SnO 2 .…”

“…To address this challenge, the sodium l -ascorbate antioxidant treatment of MXene with highly stable semiconductor metal oxides (SMOs), widely used SnO 2 , has been reported restricting the humidity degradation and enhances the stability of the sensor by doing interfacial engineering . The interfacial engineering led to the formation of heterojunctions that increases the specific surface area resulting in improved gas adsorption and transduction function for gas sensors and has been reported for the SnO 2 –TiO 2 –Ti 3 C 2 T x sensor, where 18 and 2.5 times higher sensitivity is observed toward NO 2 in comparison to Ti 3 C 2 T x and TiO 2 –Ti 3 C 2 T x , respectively . Similarly, the W 18 O 49 /Ti 3 C 2 T X composite-based sensor exhibit a high response of 11.6 toward 20 ppm acetone at RT .…”