A graphene composed of pentagons and octagons

• Published in: AIP advances Vol. 2; no. 4; pp. 042147 - 042147-8
• Main Authors: Tang, Chi-Pui, Xiong, Shi-Jie
• Format: Journal Article
• Language: English
• Published: AIP Publishing LLC 01-12-2012
• Subjects: Anisotropy; Density; Dispersions; Graphene; Mathematical analysis; Nuclear power generation; Segments; Two dimensional
• ISSN: 2158-3226; 2158-3226
• DOI: 10.1063/1.4768669

We report a possible stable structure of graphene on basis of the first principle calculation. This possible two-dimensional (2D) structure consists of pentagons and octagons (PO), and likely be formed from ordinary graphene by periodically inserting specific defects. Its density is 2.78 Atom/Å2 and the cohesive energy per atom is −8.96 eV, slightly higher than that of graphene. The calculation indicates that PO-graphene behaves like a 2D anisotropic metal. The dispersion relation of electrons near the Fermi surface shows a significant flat segment along a direction and linear behavior in different regions of the Brillouin zone. If the growth of samples is successful, the PO-graphene not only be used as anisotropy conductor and other practical application, but also can be served as a good sample for experiments which need 2D anisotropic materials.