Detection of nonpolar n-dodecane at room temperature using multiphase MoS2 chemiresistive sensor: Investigation of charge transfer on nonpolar VOC molecule

Development of Dual-Selective Chemiresistive Sensor for NH3 and NOx at Room Temperature Using MoS2/MoO2 Heterostructures

“…In the Mo 4d region (Figure 3b), the peaks appearing at 229 eV (3d 5/2 ), and 232.1 eV (3d 3/2 ) represent the Mo 4+ states of MoO 2 with peak separation of 3.1 eV corresponding to MoS 2 . 15 In addition, the lower intensity peaks at 229.73 eV (3d 5/2 ) and 232.93 eV (3d 3/2 ) with a peak separation of 3.2 eV are attributed to the Mo 4+ of MoO 2 . 26 The appearance of the S 2S peak at 226.3 eV supports the existence of MoS 2 .…”

“…5 μL of slurry was drop-casted on a silver interdigitated electrode, and the electrode was dried at 70 °C for 12 h. The fabricated MoS 2 /MoO 2 heterostructure sensors were used for further gas sensing analysis. The gas sensing system was explained in our previously published article, 15 and the schematic illustration is depicted in Figure S2. VOC vapors, including NH 3 , octane, methanol, 2-propanal, hexane, formaldehyde, ethanol, dodecane, and acetone, were generated by passing the carrier gas which is zero air (80% N 2 + 20% O 2 ) through a bubbler containing these VOCs.…”

“…13 However, achieving a higher sensing response is challenging due to the weak interaction between TMDs' surface and gas molecules. 14,15 The higher sensitivity of TMDs is accomplished by defect engineering, decorating metal nanoparticles, and heterostructure fabrication. The simplest of these techniques is the fabrication of the heterostructure.…”

“…The MoS 2 / MoO 2 heterostructure exhibits superior performance compared to pristine MoS 2 . 15 Additionally, the heterostructure with a higher carrier concentration affords better sensitivity. Furthermore, the fabricated MoS 2 /MoO 2 heterostructure sensor exhibits dual selectivity toward NH 3 and NO x gases.…”

Interface Oxygen Vacancy‐Enhanced Co3O4/WO3 Nanorod Heterojunction for Sub‐ppm Level Detection of NOx

“…R g is the sensor resistance in a target gas. [ 54 ] …”