First-principles study of pristine and Li-doped borophene as a candidate to detect and scavenge SO2gas

Xianxian Tu; Hong Xu; Xiaohua Wang; Chenyin Li; Guohong Fan; Xiangfeng Chu

doi:10.1088/1361-6528/abfabc

First-principles study of pristine and Li-doped borophene as a candidate to detect and scavenge SO₂gas

Nanotechnology. 2021 May 17;32(32). doi: 10.1088/1361-6528/abfabc.

Authors

Xianxian Tu¹, Hong Xu¹, Xiaohua Wang¹, Chenyin Li¹, Guohong Fan¹, Xiangfeng Chu¹

Affiliation

¹ School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan, Anhui 243002, People's Republic of China.

PMID: 33887713
DOI: 10.1088/1361-6528/abfabc

Abstract

In this research, the potential application of borophene as gas sensor device is explored. The first-principles theory is employed to investigate the sensing performance of pristine and Li-doped borophene for SO₂and five main atmospheric gases (including CH₄, CO₂, N₂, CO and H₂). All gases are found to be adsorbed weakly on pristine borophene, which shows weak physical interaction between the pristine borophene and gases. The gas adsorption performance of borophene is improved by the doping of Li atom. The results of adsorption energy suggest that Li-borophene exhibits high selectivity to SO₂molecule. Moreover, analyses of the charge transfer, density of states and work function also confirm the introduction of Li adatom on borophene significantly enhances the selectivity and sensitivity to SO₂. In addition, desorption time of gas from pristine and Li doped borophene indicates the Li-borophene has good desorption characteristics for SO₂molecule at high temperatures. This research would be helpful for understanding the influence of Li doping on borophene and presents the potential application of Li-borophene as a SO₂gas sensor or scavenger.

Keywords: Li doping; SO2; borophene; first-principles theory; gas sensor.