Raman evidence for pressure-induced formation of diamondene

Luiz Gustavo Pimenta Martins, Matheus J. S. Matos, Alexandre R. Paschoal, Paulo T. C. Freire, Nadia F. Andrade, Acrísio L. Aguiar, Jing Kong, Bernardo R. A. Neves, Alan B. de Oliveira, Mário S.C. Mazzoni, Antonio G. Souza Filho and Luiz Gustavo Cançado ()
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Luiz Gustavo Pimenta Martins: Universidade Federal de Minas Gerais
Matheus J. S. Matos: Universidade Federal de Ouro Preto
Alexandre R. Paschoal: Universidade Federal do Ceará
Paulo T. C. Freire: Universidade Federal do Ceará
Nadia F. Andrade: Ciência e Tecnologia do Ceará
Acrísio L. Aguiar: Universidade Federal do Piauí
Jing Kong: Massachusetts Institute of Technology
Bernardo R. A. Neves: Universidade Federal de Minas Gerais
Alan B. de Oliveira: Universidade Federal de Ouro Preto
Mário S.C. Mazzoni: Universidade Federal de Minas Gerais
Antonio G. Souza Filho: Universidade Federal do Ceará
Luiz Gustavo Cançado: Universidade Federal de Minas Gerais

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract Despite the advanced stage of diamond thin-film technology, with applications ranging from superconductivity to biosensing, the realization of a stable and atomically thick two-dimensional diamond material, named here as diamondene, is still forthcoming. Adding to the outstanding properties of its bulk and thin-film counterparts, diamondene is predicted to be a ferromagnetic semiconductor with spin polarized bands. Here, we provide spectroscopic evidence for the formation of diamondene by performing Raman spectroscopy of double-layer graphene under high pressure. The results are explained in terms of a breakdown in the Kohn anomaly associated with the finite size of the remaining graphene sites surrounded by the diamondene matrix. Ab initio calculations and molecular dynamics simulations are employed to clarify the mechanism of diamondene formation, which requires two or more layers of graphene subjected to high pressures in the presence of specific chemical groups such as hydroxyl groups or hydrogens.

Date: 2017
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DOI: 10.1038/s41467-017-00149-8

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