Improved NO2 gas sensing performance of 2D MoS2/Ti3C2Tx MXene nanocomposite

Recent developments in 2D MXene-based materials for next generation room temperature NO2 gas sensors

“…MoS 2 /MXene heterostructures with interconnected networks exhibited highly sensitive and selective NO 2 sensing properties due to the presence of abundant Mo active sites, excellent heterointerface contacts and accelerated electrons from the conductive MXene. 18,19 The excellent response (65.6%) of the 2H MoS 2 /Ti 3 C 2 T x MXene heterostructure to 100 ppm NO 2 at ambient temperature is ascribed to the quick channels for carrier transportation and a large number of active sites between 2H MoS 2 and few layered MXenes. 19 For a 2D/2D/2D composite made up of Ti 3 C 2 T x MXene@TiO 2 @MoS 2 , the strong interfacial contact between the different components facilitated the charge carrier transfer and spatial separation, resulting in improved sensing performance, with Ti 3 C 2 T x and MoS 2 acting as the electron reservoir and main sensitive materials, respectively.…”

“…18,19 The excellent response (65.6%) of the 2H MoS 2 /Ti 3 C 2 T x MXene heterostructure to 100 ppm NO 2 at ambient temperature is ascribed to the quick channels for carrier transportation and a large number of active sites between 2H MoS 2 and few layered MXenes. 19 For a 2D/2D/2D composite made up of Ti 3 C 2 T x MXene@TiO 2 @MoS 2 , the strong interfacial contact between the different components facilitated the charge carrier transfer and spatial separation, resulting in improved sensing performance, with Ti 3 C 2 T x and MoS 2 acting as the electron reservoir and main sensitive materials, respectively. 20 This NO 2 sensor based on Ti 3 C 2 T x MXene@TiO 2 @MoS 2 exhibited good response ( R a / R g = 55.6 for 50 ppm NO 2 ) which was 3.8, 7.3 and 2.1 times higher than that of TiO 2 @MoS 2, pristine MoS 2 and MXene@MoS 2 composites respectively.…”

“…In the past few decades, electrical signal-based NO 2 gas detection has been reported using sensors made of a variety of materials including metallic nanoparticles/metal-oxide, 10–14 polymers 13,15–17 and two-dimensional materials (2D) such as MoS 2 . 18–21 Recently, there has been a lot of interest in research on 2D materials, including MXenes, because of their properties like high surface area to volume ratio, layer-dependent tuneable mechanical, electrical, optical, and physicochemical properties arising from quantum confinement, and low dimensionality effects. 22–24 Among these 2D materials, graphene and transition metal dichalcogenide (TMDs)-based gas sensors are widely explored due to their excellent mechanical properties, high carrier mobility, and remarkable electrical and optical properties.…”

Room Temperature Chemiresistive Gas Sensors Based on 2D MXenes

“…The optimized sensor showed good flexibility by maintaining its performance even after bending 500 times by 60 • [102]. A MoS 2 /Ti 3 C 2 T x composite was prepared using a hydrothermal method [103]. The SEM micrographs of the components and composite are shown in Figure 11a-d.…”

Three-Dimensional MoS2/MXene Heterostructure Aerogel for Chemical Gas Sensors with Superior Sensitivity and Stability

“…Moreover, 3D architectures can provide fast mass and electron transport due to the combination of the 3D interconnected framework, and the MXene scaffold enables lower noise measurements than MoS 2 alone, because MoS 2 is much less conductive than Ti 3 C 2 T x MXene. Recently, several studies have attempted to fabricate a MoS 2 /MXene heterostructure by a hydrothermal reaction chemically decorating MoS 2 onto MXene, for application in chemiresistive gas sensors. − However, this process is hampered by hydrothermal reaction constraints such as poor quality of the MoS 2 nanosheets (i.e., coexistence of 1T phase and 2H phase) and the high temperature, which cause significant oxidation in the Ti 3 C 2 T x MXene structure to result in TiO 2 transformation.…”