New Paradigm for Gas Sensing by Two-Dimensional Materials

Vasudeo Pandurang Babar, Sitansh Sharma, Udo Schwingenschlögl

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


The adsorption behavior and electronic transport properties of CO and NH3 molecules on para-C3Si and meta-C3Si monolayers are studied using first-principles calculations and the non-equilibrium Green's function method. The adsorption sites are determined along with their adsorption energies. It turns out that CO and NH3 molecules physisorb on both monolayers. The current-voltage characteristics show that the para-C3Si monolayer can be used to sense CO and NH3 gases with high sensitivity. In contrast to other two-dimensional materials, the sensing mechanism is not based on charge transfer but on the presence of Dirac states and their susceptibility to symmetry-breaking structural distortions.
Original languageEnglish (US)
Pages (from-to)13104-13109
Number of pages6
JournalJournal of Physical Chemistry C
Issue number20
StatePublished - May 8 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).


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