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Two-dimensional stoichiometric boron carbides with unexpected chemical bonding and promising electronic properties

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Abstract

Exploring new two-dimensional materials with novel properties is becoming a particularly important task due to their potential applications in future nano-mechanics, electronics, and optoelectronics. In the present study, the hitherto unknown stable two-dimensional boron carbides with various stoichiometries are revealed via the structure swarm optimization method combined with first-principles calculations. The predicted new compounds are energetically more favorable compared with the previously proposed counterparts. Counterintuitively, we identify two B–C bonding patterns: pyramidal-geometry tetra-coordinated and hexa-coordinated sp2 carbon moiety. The intriguing covalent bonding modes create distinct and fascinating physical and chemical properties. For instance, we discover that the predicted B4C3 has an ultrahigh Young's modulus that can even outperform graphene; the B2C sheet is metallic with a relatively high superconducting transition temperature (Tc ≈ 21.20 K). On the other hand, the well-located band edge makes β-B3C2 a potentially promising metal-free optoelectronic material for visible-light water splitting.

Graphical abstract: Two-dimensional stoichiometric boron carbides with unexpected chemical bonding and promising electronic properties

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Publication details

The article was received on 03 Oct 2017, accepted on 27 Nov 2017 and first published on 28 Nov 2017


Article type: Paper
DOI: 10.1039/C7TC04505K
Citation: J. Mater. Chem. C, 2018, Advance Article
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    Two-dimensional stoichiometric boron carbides with unexpected chemical bonding and promising electronic properties

    D. Fan, S. Lu, Y. Guo and X. Hu, J. Mater. Chem. C, 2018, Advance Article , DOI: 10.1039/C7TC04505K

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