First-Principles Predictions of MoS<sub>2</sub>-WS<sub>2</sub> In-Plane Heterostructures for Sensing Dissolved Gas Species in Oil-Immersed Transformers
Tian Tian, Xiu Zhou, Jiaying Yu, Jin Bai, Lei Chen, Ninghui He, Xiuguang Li, Heng Zhang, Hao Cui
Abstract
High Resolution Image Download MS PowerPoint Slide This work from first-principles insight uses a MoS 2 -WS 2 in-plane heterostructure as a potential sensing material for detection of CO and C 2 H 2, two typical dissolved gases in oil-immersed transformers, in order to evaluate the operation status. The adsorption performance of the MoS 2 -WS 2 heterostructure upon two gas species is assessed via three adsorption sites and compared with isolated MoS 2 and WS 2 . Results indicate that MoS 2 -WS 2 performs with a much stronger binding force and charge-transfer for adsorptions of CO and C 2 H 2 in comparison to the isolated counterpart, which gives rise to more obvious deformation in the electronic property of MoS 2 -WS 2 as well as a much larger resistance-based sensing response. The recovery time of MoS 2 -WS 2 for desorption of CO and C 2 H 2 molecules is also appropriate to allow the reusability of such a sensor. The findings in this work uncover the admirable sensing potential of transition metal dichalcogenides (TMDs)-based heterostructures upon oil dissolved gases, which opens up a new way to explore novel 2D nanomaterials as resistive gas sensors for dissolved gas analysis in electrical oil-immersed transformers.