Fast and recoverable NO₂ detection achieved by assembling ZnO on Ti₃C₂T_x MXene nanosheets under UV illumination at room temperature

Abstract

Recently, Ti3C2Tx MXene has received emerging attention in the field of gas sensors owing to their characteristics of high conductivity and abundant surface functional groups. However, Ti3C2Tx-based gas sensors still...

Amine-functionalized stable Nb2CTx MXene toward room temperature ultrasensitive NO2 gas sensor

“…The general expression for MXene is M n+1 X n T x , where M is early transition metals, X is carbides/nitrides with n = 1, 2, or 3, and T x is the surface terminations such as -O, -OH, and -F. 12 MXenes have excellent applications in energy harvesting, 13 energy storage, 14 photo/electrocatalysts, 15 water purification, 16 and sensors 17 due to the excellent properties of MXenes, such as high metallic conductivity (results in low noise), surface functional groups (results in strong binding of analytes), and high specific surface area (results in high signal to noise ratio). Recently, Ti 3 C 2 T x , V 2 CT x , MoC 1Àx MXenes have been studied experimentally for gas sensing applications 18,19 and other MXenes were studied theoretically. 20 g-Poly(L-glutamic acid) (g-PGA) was used to modify the Ti 3 C 2 T x MXene to improve the gas sensing performance.…”

Room-temperature triethylamine sensing of a chemiresistive sensor based on Sm-doped SnS2/ZnS hierarchical microspheres

“…12a, the oxygen molecules in the air ambience could be easily adsorbed on the surfaces of the sensing material owing to the large electronegativity (0.43 eV). 66 They could capture electrons from the conduction band of the SnS 2 /ZnS hierarchical microspheres to form chemisorbed oxygen species (O 2 − ), and the specific reaction process is shown in the equations below: 67 O 2 (gas) → O 2 (ads)O 2 (ads) + e − → O 2 − (ads)…”

Zinc stannate microcubes with an integrated microheater for low-temperature NO2 detection

“…5b shows a schematic diagram of the interaction of O 2− ion species and NO 2 gas on the ZnSnO 3 surface. The reaction kinetics may be explained by the following reactions: 55–57 O 2(gas) → O 2(ads.) O 2(ads.)…”