Predicting experimentally stable allotropes: Instability of penta-graphene

Author:

Ewels Christopher P.,Rocquefelte Xavier,Kroto Harold W.,Rayson Mark J.,Briddon Patrick R.,Heggie Malcolm I.

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.

Funder

European Commission

NSF | MPS | Division of Materials Research

NSF | MPS | Division of Chemistry

Florida State University

Swedish Research Council Formas

Publisher

Proceedings of the National Academy of Sciences

Subject

Multidisciplinary

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