Two-Dimensional NbS₂ Gas Sensors for Selective and Reversible NO₂ Detection at Room Temperature

Abstract

Transition metal dichalcogenides (TMDs) have attracted enormous attention in diverse research fields. Especially, gas sensors are considered in a promising application exploiting TMDs. However, the studies are confined to only major TMDs such as MoS 2 and WS 2 . Particularly, the chemoresistive sensing properties of two-dimensional (2D) NbS 2 have never been explored. For the first time, we report room temperature NO 2 sensing characteristics of 2D NbS 2 nanosheets and the sensing mechanisms using first-principles calculations based on density functional theory. The results demonstrate that the NbS 2 edges possessing different configurations depending on synthetic conditions differ in the sensing ability of the TMD nanosheets. This study not only broadens the potential of 2D NbS 2 for gas sensing applications, but also presents the important role of edge configuration of TMDs depending on synthetic conditions for further studies.

Rational Design of Semiconductor‐Based Chemiresistors and their Libraries for Next‐Generation Artificial Olfaction

“…Accordingly, although rGOs are more cost‐effective gas sensors than graphene, the humidity dependence of gas sensing characteristics should be suppressed for designing reliable rGO‐based artificial olfaction devices. Most TMDs, including MoS 2 , [ 547 ] WS 2 , [ 548–551 ] SnS 2 , [ 552 ] NbS 2, [ 553 ] are known for significant humidity dependence in their gas sensing characteristics. MoS 2 [ 554,555 ] and WS 2 [ 549,556 ] are also good humidity sensors.…”

Nanoelectromechanical Sensors Based on Suspended 2D Materials

“…Selectivity can be achieved through dedicated functionalization layers that enhance the reactivity only for certain gases. In addition to graphene, 2D materials such as MoS 2 [ 112 , 249 ], molybdenum diselenide (MoSe 2 ) [ 110 , 250 ], molybdenum ditelluride (MoTe 2 ) [ 251 ], tungsten diselenide (WS 2 ) [ 117 ], niobium diselenide (NbS 2 ) [ 252 ], rhenium disulfide (ReS 2 ) [ 253 ], or platinum diselenide (PtSe 2 ) [ 119 ] have been shown to possess high gas and chemical sensor performance. Some TMD materials even show quite specific sensing behavior; in particular, PtSe 2 has been shown to have a high selectivity towards NO 2 , which also was validated theoretically [ 119 ].…”

Environmental Analysis with 2D Transition-Metal Dichalcogenide-Based Field-Effect Transistors

“…In addition to MoS 2 , other layered pristine TMDCs were employed for gas sensing and studies have demonstrated WS 2 [94], MoSe 2 [13,41], WSe 2 [95][96][97][98], MoTe 2 [42,43,99,100], and NbS 2 [101] can be used in FET for the detection of O 2 , NO, NO 2 , SO 2 , etc., with a sensing capability of ppm to ppb level. Studies on MoSe 2 FET sensor suggest that gap state variation is the key mechanism in NO 2 sensing based on modeling and quantum transport simulation.…”