期刊
CARBON
卷 65, 期 -, 页码 341-348出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2013.08.035
关键词
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资金
- National Basic Research Program of China [2012CB932302]
- National Natural Science Foundation of China [91221101]
- 111 project [B13029]
- Natural Science Fund for Distinguished Young Scholars of Shandong Province [JQ201001]
Graphdiyne is a recently-synthesized carbon allotrope with a framework of sp- and sp(2)-hybridized carbon atoms. From first-principles calculations, we propose a possible transition of graphdiyne to a novel carbon allotrope (h-carbon) whose structure is a superlattice of carbon nanotubes and graphene nanoribbons. The energy barrier of this endothermic transition was estimated to be 4.30 kcal/mol at zero pressure, which is much lower than that of the graphite-diamond transition at high pressure. First-principles calculations on the phonon spectrum and the elastic constants of the h-carbon revealed that it is kinetically and mechanically stable. This unique framework of sp(2)- and sp(3)-hybridized carbon atoms is energetically neutral versus diamond. The hardness of the h-carbon (35.52 GPa) is 1/3 that of diamond and very close to beta-SiC crystal. Accurate electronic structure calculations based on the Heyd, Scuseria, and Emzerhof approach and GW approximation indicate that the h-carbon is a semiconducting material with a band gap of 2.20-2.56 eV. (C) 2013 Elsevier Ltd. All rights reserved.
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