Abstract
Exploring and evaluating the potential applications of two-dimensional graphene is an increasingly hot topic in graphene research. In this paper, by studying the adsorption of NO, N2O, and NO2 on pristine and silicon (Si)-doped graphene with density functional theory methods, we evaluated the possibility of using Si-doped graphene as a candidate to detect or reduce harmful nitrogen oxides. The results indicate that, while adsorption of the three molecules on pristine graphene is very weak, Si-doping enhances the interaction of these molecules with graphene sheet in various ways: (1) two NO molecules can be adsorbed on Si-doped graphene in a paired arrangement, while up to four NO2 molecules attach to the doped graphene with an average adsorption energy of −0.329 eV; (2) the N2O molecule can be reduced easily to the N2 molecule, leaving an O-atom on the Si-doped graphene. Moreover, we find that adsorption of NO and NO2 leads to large changes in the electronic properties of Si-doped graphene. On the basis of these results, Si-doped graphene can be expected to be a good sensor for NO and NO2 detection, as well as a metal-free catalyst for N2O reduction.
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Notes
The adsorption energy of n adsorbate on Si-doped graphene is defined as: E ads = [ E total (nadsorbate-Si-doped graphene)] - n[ E total (adsorbate)] - [ E total Si-doped graphene)]/n, where E total is the total energy of the studied system and n is the number of the adsorbate
see footnote 1
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Acknowledgments
We gratefully acknowledge support of this research by the Key Program Projects of the National Natural Science Foundation of China (No 21031001), the National Natural Science Foundation of China (No 20971040), the Cultivation Fund of the Key Scientific and Technical Innovation Project, Ministry of Education of China (No 708029), the Key Program Projects of the Province Natural Science Foundation of Heilongjiang Province (No. ZJG0602-01), the National Basic Research Priority Program (No. 2007CB914104), the Committee of Education of Heilongjiang Province (No. 11541095), the Scientific Research Foundation for Doctor of Harbin Normal University (08XKYL38), and Heilong Jiang Postdoctoral Funds for scientific research initiation. The authors would like to express their gratitude to the reviewers for raising invaluable comments and suggestions.
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Figure S1
Spin densities of a the adsorbed Si-doped graphene by an individual NO molecule, and b the free NO molecule. The isovalue is 0.025 au. (DOC 106 kb)
Figure S2
Highest occupied molecular orbitals (HOMOs) of Si-doped graphene after adsorbing one NO molecule. The isovalue is 0.025 au. (DOC 61 kb)
Figure S3
a Spin densities, and b HOMOs of the adsorbed Si-doped graphene by an individual NO2 molecule. The isovalue is 0.025 au. (DOC 274 kb)
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Chen, Y., Gao, B., Zhao, JX. et al. Si-doped graphene: an ideal sensor for NO- or NO2-detection and metal-free catalyst for N2O-reduction. J Mol Model 18, 2043–2054 (2012). https://doi.org/10.1007/s00894-011-1226-x
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DOI: https://doi.org/10.1007/s00894-011-1226-x