Publication Date:
2018-03-13
Description:
Owing to the large surface area, 2-D materials are being used for sensing gas molecules, which are important for environmental protection and human health. Using first principle calculations, adsorption of CO and NO gas molecules on Cu-substituted monolayer MoS 2 is studied in terms of energy, charge transfer, and density of states. Further, the behavior of CO and NO on Cu-substituted monolayer MoS 2 -based single electron transistor (SET) is explored. Strong interaction between Cu metal and MoS 2 sheet suggests the stability of the Cu-doped MoS 2 system at ambient conditions. It is further found that on doping Cu into MoS 2 sheet, the adsorption strength of CO and NO molecules got enhanced as compared with the pristine MoS 2 sheet and, hence, possesses better sensing capability. The sensing response of the Cu-doped MoS 2 sheet in the SET environment toward these molecules is studied from the calculated charge stability diagram that serves as a unique fingerprint of each adsorbed molecule. The charging energy is reduced when Cu impurity is added to MoS 2 for CO/NO adsorption, which makes such system more suitable in low-powered SET devices. The results show that SET based on Cu-doped MoS 2 can essentially detect hazardous molecules and is proved to have potential application in gas sensors.
Print ISSN:
1530-437X
Electronic ISSN:
1558-1748
Topics:
Electrical Engineering, Measurement and Control Technology
