Computational searching for new stable graphyne structures and their electronic properties

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We devised a useful computational strategy to search for new types of stable two-dimensional carbon allotropes. As an illustration, we considered all the isomers of C18H6 and found three stable building units for graphynes. Then, we investigated the stability of each unit {hexagonal/triangular/parallelogrammatic C18H6 (C18H6h/C18H6t/C18H6p)} in that pi-conjugation effects improve the stability and conductivity of the system. The resonance energies of the above C18H6 are smaller than that of benzene, but still large; among the three types, C18H6t is the most stable, followed by C18H6p. This supports why the graphyne composed of C18H6t was already synthesized, while it is likely that the graphynes composed of C18H6h and C18H6p could also be synthesized. The graphynes composed of C18H6h and C18H6p were predicted to have zero band gaps with Dirac cones, whereas that composed of C18H6t turned out to be a semiconductor with the band gap of 0.49 eV. In particular, C18H6p has not only direction-dependent Dirac cones but also their unconventional locations in the first Brillouin zone.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2016-03
Language
English
Article Type
Article
Keywords

UNSATURATED MACROCYCLIC COMPOUNDS; BASIS-SET; CARBON; SHEETS; GRAPHDIYNE; TRANSPORT; BENZENE; SYSTEMS; FILMS

Citation

CARBON, v.98, pp.404 - 410

ISSN
0008-6223
DOI
10.1016/j.carbon.2015.10.102
URI
http://hdl.handle.net/10203/207613
Appears in Collection
CH-Journal Papers(저널논문)
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