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A new 2D monolayer BiXene, M2C (M = Mo, Tc, Os)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
UCL, Dept Earth Sci, London WC1E 6BT, England..
Chinese Acad Sci, IHEP, CSNS, Dongguan 523803, Peoples R China.;DINS, Dongguan 523808, Peoples R China..
Dalian Univ Technol, Key Lab Mat Modificat Laser Ion & Electron Beams, Minist Educ, Dalian 116024, Peoples R China..
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2016 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 8, no 34, 15753-15762 p.Article in journal (Refereed) Published
Abstract [en]

The existence of BiXenes, a new family of 2D monolayers, is hereby predicted. Theoretically, BiXenes have 1H symmetry (P (6) over bar m2) and can be formed from the 4d/5d binary carbides. As the name suggests, they are close relatives of MXenes, which instead have 1T symmetry (P (3) over bar m1). The newly found BiXenes, as well as some new MXenes, are shown to have formation energies close to that of germanene, which suggests that these materials should be possible to be synthesised. Among them, we illustrate that 1H-Tc2C and 1T-Mo2C are dynamically stable at 0 K, while 1H-Mo2C, 1T-Tc2C, 1H-Os2C, and 1T-Rh2C are likely to be stabilised via strain or temperature. In addition, the nature of the chemical bonding is analysed, emphasizing that the covalency between the transition metal ions and carbon is much stronger in BiXenes than in MXenes. The emergence of BiXenes can not only open up a new era of conducting 2D monolayers, but also provide good candidates for carrier materials aimed at energy storage and spintronic devices that have already been unveiled in MXenes.

Place, publisher, year, edition, pages
2016. Vol. 8, no 34, 15753-15762 p.
National Category
Nano Technology Materials Engineering
URN: urn:nbn:se:uu:diva-304554DOI: 10.1039/c6nr03602cISI: 000382053300039PubMedID: 27528499OAI: oai:DiVA.org:uu-304554DiVA: diva2:1033305
Knut and Alice Wallenberg FoundationSwedish Research CouncileSSENCE - An eScience Collaboration
Available from: 2016-10-06 Created: 2016-10-06 Last updated: 2016-10-06Bibliographically approved

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