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Predicting experimentally stable allotropes: Instability of penta-graphene

Abstract : In recent years, a plethora of theoretical carbon allotropes have been proposed, none of which has been experimentally isolated. We discuss here criteria that should be met for a new phase to be potentially experimentally viable. We take as examples Haeckelites, 2D networks of sp2-carbon–containing pentagons and heptagons, and “penta-graphene,” consisting of a layer of pentagons constructed from a mixture of sp2- and sp3-coordinated carbon atoms. In 2D projection appearing as the “Cairo pattern,” penta-graphene is elegant and aesthetically pleasing. However, we dispute the author’s claims of its potential stability and experimental relevance
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Christopher P. Ewels, Xavier Rocquefelte, Harold W. Kroto, Mark J. Rayson, Patrick R. Briddon, et al.. Predicting experimentally stable allotropes: Instability of penta-graphene. Proceedings of the National Academy of Sciences of the United States of America , National Academy of Sciences, 2015, 112 (51), pp.15609-15612. ⟨10.1073/pnas.1520402112⟩. ⟨hal-01240650⟩

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