Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2011-04-11
Physics
Condensed Matter
Disordered Systems and Neural Networks
Scientific paper
Ordered graphene has been extensively studied. In this paper we undertake a first density functional study of it topologically disordered analogues of graphene, in the form of a random network, consisting predominantly of hexagonal rings, but also including pentagons and heptagons. After some preliminaries with crystalline material, we relax various random network models and find that the presence of carbon pentagons induce local curvature, thus breaking the initial planar symmetry, in some analogy with the case of fullerenes. Using density functional theory to calculate the total energy, we find that while the planar state is locally stable, there is a puckered state that has lower energy. The scale of the puckering is consistent with that expected with local maxima and minima associated with pentagons surrounded by larger rings; forming local "buckyball domes".
Drabold David A.
Inam F.
Kumar Alok
Li Yadong
Thorpe M. F.
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