articleProceedings of the National Academy of SciencesFeb 2, 2015GREEN OA

Penta-graphene: A new carbon allotrope

SZShunhong ZhangJZJian ZhouQWQian WangXCXiaoshuang ChenYKYoshiyuki Kawazoe

Ministry of Education of the People's Republic of China · Virginia Commonwealth University · +6 more institutions

PubMed
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Abstract

A 2D metastable carbon allotrope, penta-graphene, composed entirely of carbon pentagons and resembling the Cairo pentagonal tiling, is proposed. State-of-the-art theoretical calculations confirm that the new carbon polymorph is not only dynamically and mechanically stable, but also can withstand temperatures as high as 1000 K. Due to its unique atomic configuration, penta-graphene has an unusual negative Poisson's ratio and ultrahigh ideal strength that can even outperform graphene. Furthermore, unlike graphene that needs to be functionalized for opening a band gap, penta-graphene possesses an intrinsic quasi-direct band gap as large as 3.25 eV, close to that of ZnO and GaN. Equally important, penta-graphene…

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Topics & keywords

Topics
Keywords
  • Graphene
  • Fullerene
  • Carbon fibers
  • Materials science
  • Graphite
  • Diamond
  • Nanotechnology
  • Carbon nanotube
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