Hard, transparent, sp3 -containing 2D phase formed from few-layer graphene under compression.

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dc.contributor.authorMartins, Luiz Gustavo Pimenta
dc.contributor.authorSilva, Diego L.
dc.contributor.authorSmith, Jesse S.
dc.contributor.authorLu, Ang-Yu
dc.contributor.authorSu, Cong
dc.contributor.authorHempel, Marek
dc.contributor.authorOcchialini, Connor
dc.contributor.authorJi, Xiang
dc.contributor.authorPablo, Ricardo
dc.contributor.authorAlencar, Rafael Silva
dc.contributor.authorSouza, Alan Custodio dos Reis
dc.contributor.authorPinto, Alysson Alves
dc.contributor.authorOliveira, Alan Barros de
dc.contributor.authorBatista, Ronaldo Junio Campos
dc.contributor.authorPalacios, Tomas
dc.contributor.authorMazzoni, Mário Sérgio de Carvalho
dc.contributor.authorMatos, Matheus Josué de Souza
dc.contributor.authorComin, Riccardo
dc.contributor.authorKong, Jing
dc.contributor.authorCançado, Luiz Gustavo de Oliveira Lopes
dc.date.accessioned2022-03-08T19:28:47Z
dc.date.available2022-03-08T19:28:47Z
dc.date.issued2021pt_BR
dc.description.abstractDespite several theoretically proposed two-dimensional (2D) diamond structures, experimental efforts to obtain such structures are in initial stage. Recent high-pressure experiments provided significant advancements in the field, however, expected properties of a 2D-like diamond such as sp3 content, transparency and hardness, have not been observed together in a compressed graphene system. Here, we compress few-layer graphene samples on SiO2/Si substrate in water and provide experimental evidence for the formation of a quenchable hard, transparent, sp3 -containing 2D phase. Our Raman spectroscopy data indicates phase transition and a surprisingly similar critical pressure for two-, five-layer graphene and graphite in the 4e6 GPa range, as evidenced by changes in several Raman features, combined with a lack of evidence of significant pressure gradients or local non-hydrostatic stress components of the pressure medium up to z 8 GPa. The new phase is transparent and hard, as evidenced from indentation marks on the SiO2 substrate, a material considerably harder than graphene systems. Furthermore, we report the lowest critical pressure (z 4 GPa) in graphite, which we attribute to the role of water in facilitating the phase transition. Theoretical calculations and experimental data indicate a novel, surfaceto-bulk phase transition mechanism that gives hint of diamondene formation.pt_BR
dc.identifier.citationMARTINS, L. G. P. et al. Hard, transparent, sp3 -containing 2D phase formed from few-layer graphene under compression. Carbon, v. 173, p. 744-757, 2021. Disponível em: <https://www.sciencedirect.com/science/article/abs/pii/S0008622320311179>. Acesso em: 25 ago. 2021.pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.carbon.2020.11.038pt_BR
dc.identifier.issn0008-6223
dc.identifier.urihttp://www.repositorio.ufop.br/jspui/handle/123456789/14645
dc.identifier.uri2https://www.sciencedirect.com/science/article/abs/pii/S0008622320311179pt_BR
dc.language.isoen_USpt_BR
dc.rightsrestritopt_BR
dc.titleHard, transparent, sp3 -containing 2D phase formed from few-layer graphene under compression.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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