Mesoporous MXene/ZnO nanorod hybrids of high surface area for UV-activated NO2 gas sensing in ppb-level

Development of Highly Sensitive and Humidity Independent Room Temeprature NO2 Gas Sensor Using Two Dimensional Ti3C2Tx Nanosheets and One Dimensional WO3 Nanorods Nanocomposite

“…25 The terminal group oxygen (O), hydroxyl (OH), and fluorine (F), high surface area, and high conductivity help in modulating the work function, provide a higher number of adsorption sites for gas molecules, and ease the charge transport capability during the sensing process, respectively. 26 Furthermore, Ti 3 C 2 T x based sensor exhibits high signal-to-noise ratio, high selectivity, and sensitivity as compared to other 2D materials due to their rich terminal groups, which improve the sensing response. 27,28 However, the layer sheets of MXene restack during the drying process, resulting in loss of specific surface area and limiting their sensing performance.…”

“…Metal oxides with one dimension (1D) morphology exhibit faster charge transportation as it does not require gas diffusion process prior to surface reaction. , Further, the interfacial engineering of 1D metal oxide with highly conductive two dimensional (2D) material leads to physical interface (heterojunctions) that enhances the overall surface area and the number of reaction sites and aids in efficient charge carrier transportation, which is beneficial for enhancing the gas sensing properties. − Recently, two dimensional transitional metal carbide (Ti 3 C 2 T x ) MXenes have gained popularity due their unique laminar structure, high surface area, conductivity, excellent adsorption capability, and low cost synthesis . The terminal group oxygen (O), hydroxyl (OH), and fluorine (F), high surface area, and high conductivity help in modulating the work function, provide a higher number of adsorption sites for gas molecules, and ease the charge transport capability during the sensing process, respectively . Furthermore, Ti 3 C 2 T x based sensor exhibits high signal-to-noise ratio, high selectivity, and sensitivity as compared to other 2D materials due to their rich terminal groups, which improve the sensing response. , However, the layer sheets of MXene restack during the drying process, resulting in loss of specific surface area and limiting their sensing performance.…”

Two-dimensional MXenes: recent emerging applications

“…Wang et al have exposed the superior sensing ability of MXene/ZnO hybrids for detecting NO 2 gas molecules. 187 A very high sensing response of 346% was obtained even at room temperature upon exposure to a very small concentration (200 ppb) of NO 2 molecules. The hybrid showed a detection limit as small as 0.2 ppb with high selectivity.…”

Room-Temperature Detection of Perfluoroisobutyronitrile with SnO2/Ti3C2Tx Gas Sensors

“…However, gas devices driven by intrinsic SMOs frequently suffer from low conductivity, high working temperature, and lack of selectivity, , thereby impeding their sensing application in practical scenes. Many methods have been proposed for the fabrication and application of the alloy-based heterostructure of SMO–MXene, such as SnO 2 –, ZnO–, and TiO 2 –MXene, to improve the room-temperature sensing performance of MXene and SMO, as well as the sensing performance to NO 2 , NH 3 , and C 3 H 6 O. − However, these gas sensor designs rarely pay attention to fluorocarbon gases and mainly focus on common nitrogen or hydrocarbon gases, thereby ignoring the emergent operation and maintenance requirement faced by the power industry since the trial operation of the eco-friendly C 4 F 7 N-based GIE. Moreover, our previous study indicated that SnO 2 is a typical SMO with outstanding performance in response to C 4 F 7 N at a working temperature of 275 °C .…”