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Title: Hard, transparent, sp3 -containing 2D phase formed from few-layer graphene under compression.
Authors: Martins, Luiz Gustavo Pimenta
Silva, Diego L.
Smith, Jesse S.
Lu, Ang-Yu
Su, Cong
Hempel, Marek
Occhialini, Connor
Ji, Xiang
Pablo, Ricardo
Alencar, Rafael S.
Souza, Alan Custodio dos Reis
Pinto, Alysson Alves
Oliveira, Alan Barros de
Batista, Ronaldo Junio Campos
Palacios, Tomas
Mazzoni, Mário Sérgio de Carvalho
Matos, Matheus Josué de Souza
Comin, Riccardo
Kong, Jing
Cançado, Luiz Gustavo de Oliveira Lopes
Issue Date: 2021
Citation: MARTINS, 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: <>. Acesso em: 25 ago. 2021.
Abstract: Despite 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.
ISSN: 0008-6223
Appears in Collections:DEFIS - Artigos publicados em periódicos

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