ACS sensors | 2019
Two-dimensional NbS2 Gas Sensors for Selective and Reversible NO2 Detection at Room Temperature.
Abstract
Transition metal dichalcogenides (TMDs) have attracted enormous attention on diverse research fields. Especially, gas sensors are considered as a promising application exploiting TMDs. However, the studies are confined to only major TMDs such as MoS2, and WS2. Particularly, the chemoresistive sensing properties of two-dimensional (2D) NbS2 have never been explored yet. For the first time, we report room temperature NO2 sensing characteristics of 2D NbS2 nanosheets and the sensing mechanisms by using first-principles calculations based on density functional theory. The result demonstrates that the NbS2 edges possessing different configurations depending on synthetic conditions differ the sensing ability of the TMD nanosheets. This study not only broadens the potential of 2D NbS2 for gas sensing applications, but also presents the important role of edge configuration of TMDs depending on synthetic conditions for further studies.