Highly sensitive and recoverable room-temperature NO2 gas detection realized by 2D/0D MoS2/ZnS heterostructures with synergistic effects

Selective N,N-Dimethylformamide Vapor Sensing Using MoSe2/Multiwalled Carbon Nanotube Composites at Room Temperature

“…In contrast, two-dimensional (2D) layered materials, particularly transition-metal dichalcogenides (TMDCs) have shown a useful and tunable electronic band gap and optical and electrochemical properties, leading to applications in various fields including optoelectronic devices, catalysis, solar cells, supercapacitors, and gas sensing. − Layered TMDCs, for instance, MoS 2 and its composites with other materials such as SnO 2 , , ZnO, and ZnS, have shown excellent performance toward the sensing of gases such as NH 3 and NO 2 . Due to the dangling-bond-free surface, charge transport capabilities, and biocompatibility, they are also considered as excellent options for flexible electronics. − Among the 2D TMDCs, molybdenum diselenide (MoSe 2 ) is a layered nanomaterial with a large surface to volume ratio, exceptional adsorption–desorption properties, and a direct energy band gap of 1.55 eV, indicating higher electrical conductivity. , It also possesses a higher adsorption energy for chemical compounds in comparison to graphene, black phosphorus, and molybdenum sulfide and has the capability of selective detection at room temperature. , …”

“…17,18 In contrast, two-dimensional (2D) layered materials, particularly transition-metal dichalcogenides (TMDCs) have shown a useful and tunable electronic band gap and optical and electrochemical properties, leading to applications in various fields including optoelectronic devices, catalysis, solar cells, supercapacitors, and gas sensing. 19−23 Layered TMDCs, for instance, MoS 2 and its composites with other materials such as SnO 2 , 24,25 ZnO, 19 and ZnS, 23 have shown excellent performance toward the sensing of gases such as NH 3 and NO 2 . Due to the dangling-bond-free surface, charge transport capabilities, and biocompatibility, they are also considered as excellent options for flexible electronics.…”

Simultaneous Detection of CO and NH3 Gases at Room Temperature with an Array of ZnS Chemiresistive Sensors and the Superposition Principle

“…Similarly, when the sensor is re-exposed to air, gas molecules desorb from the sensing material, and the material’s resistance returns to the initial value. As ZnS is an n-type semiconductor material and the target gases are reducing gases, the electrons transfer from target gas to sensing material. − Before gas adsorption, there have already been some electrons existing in the conduction band of the n-type ZnS. When ZnS is exposed to electron-donating gases NH 3 and CO, electronic charge transfers from gas molecules to the sensing layer and increases the electron charge carrier density of ZnS.…”

Three-dimensional mesoporous ultrathin monometallic cobalt layered double hydroxides nanomaterials as efficient NO2 gas sensor at room temperature

“…When the sensor was exposed to the oxidative gas NO 2 at room temperature, due to the solid electronic affinity of NO 2 molecules, the NO 2 gas molecules could easily capture the electrons to form an ion gas and undergo a redox reaction. The ion gas acts with the "electron donor" chemically adsorbent oxygen on the surface, 93,94 resulting in the gas sensor resistance changes (eqn (3) and ( 4)). The sample sensor had a p-type semiconductor character, which is known to be conductive by holes.…”