Novel Janus MoSiGeN4 nanosheet: adsorption behaviour and sensing performance for NO and NO2 gas molecules. Issue 38 (1st September 2022)

• Record Type: Journal Article
• Authors: Weng, Yixin; Ma, Xinguo; Yuan, Gang; Lv, Hui; Yuan, Zhongyong
• Is Part Of: RSC advances. Volume 12:Issue 38(2022)
• Page Start: 24743
• Page End: 24751
• Publication Date: 2022-09-01
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d2ra03957e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A novel Janus MoSiGeN4 nanosheet is proposed for detecting poisonous gas molecules. Abstract : A novel Janus MoSiGeN4 nanosheet is proposed for detecting poisonous gas molecules. Herein, the adsorption behaviour and sensing performance of both sides of the MoSiGeN4 monolayer to NO and NO2 gas molecules were investigated by first-principles calculations. Firstly, it is found that the MoSiGeN4 monolayer exhibits structural stability and indirect gap semiconductor characteristics. The largest adsorption energy of NO2 molecules on the MoSiGeN4 monolayer is −0.24 eV, which is higher than the −0.13 eV for NO molecules. Of course, the physisorption between gas molecules and the MoSiGeN4 monolayer appears with slight charge transfer. It is confirmed that NO molecules and NO2 molecules act as electron donors and electron acceptors, respectively. Meanwhile, the generation of small band gaps and impurity levels in the electronic structures after gas adsorption is in favour of the enhancement of electronic conductivity. Furthermore, the longest recovery times of NO and NO2 molecules are predicted to be 0.15 and 10.67 ns at room temperature, and the lateral diffusion at the surface requires crossing a large energy barrier. These findings provide indisputable evidence for further design and fabrication of highly sensitive gas sensors based on the MoSiGeN4 monolayer.