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

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dc.creatorLuiz Gustavo Pimenta Martins
dc.creatorDiego Edison Lopez Silva
dc.creatorJesse Smith
dc.creatorAng-Yu Lu
dc.creatorCong Su
dc.creatorMarek Hempel
dc.creatorConnor Occhialini
dc.creatorXiang Ji
dc.creatorRicardo Pablo Pedro
dc.creatorRafael Silva Alencar
dc.creatorAlan Custodio dos Reis Souza
dc.creatorAlysson Alves Pinto
dc.creatorAlan Barros de Oliveira
dc.creatorRonaldo Junio Campos Batista
dc.creatorTomás Palacios
dc.creatorMario Sergio de Carvalho Mazzoni
dc.creatorMatheus Josué de Souza Matos
dc.creatorRiccardo Comin
dc.creatorJing Kong
dc.creatorLuiz Gustavo de Oliveira Lopes Cançado
dc.date.accessioned2025-04-25T17:14:37Z
dc.date.accessioned2025-09-08T23:48:31Z
dc.date.available2025-04-25T17:14:37Z
dc.date.issued2021
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.identifier.doihttps://doi.org/10.1016/j.carbon.2020.11.038
dc.identifier.issn1873-3891
dc.identifier.urihttps://hdl.handle.net/1843/81861
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofCarbon
dc.rightsAcesso Restrito
dc.subjectGrafeno
dc.subject.otherGraphene
dc.titleHard, transparent, sp3-containing 2D phase formed from few-layer graphene under compression
dc.typeArtigo de periódico
local.citation.epage757
local.citation.spage744
local.citation.volume173
local.description.resumoDespite 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 4–6 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 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 ( 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, surface-to-bulk phase transition mechanism that gives hint of diamondene formation.
local.identifier.orcidhttps://orcid.org/0000-0001-9777-7999
local.identifier.orcidhttps://orcid.org/0000-0002-9992-7564
local.identifier.orcidhttps://orcid.org/0000-0002-8395-9465
local.identifier.orcidhttps://orcid.org/0000-0002-6381-0321
local.identifier.orcidhttps://orcid.org/0000-0002-6803-2223
local.identifier.orcidhttps://orcid.org/0000-0002-7471-4968
local.identifier.orcidhttps://orcid.org/0000-0002-2190-563X
local.identifier.orcidhttps://orcid.org/0000-0002-0398-3992
local.identifier.orcidhttps://orcid.org/0000-0002-1069-9973
local.identifier.orcidhttps://orcid.org/0000-0002-7073-1226
local.identifier.orcidhttps://orcid.org/0000-0001-8866-5469
local.identifier.orcidhttps://orcid.org/0000-0002-4031-0156
local.identifier.orcidhttps://orcid.org/0000-0002-5151-1180
local.identifier.orcidhttps://orcid.org/0000-0002-2133-5155
local.identifier.orcidhttps://orcid.org/0000-0003-0816-0888
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://www.sciencedirect.com/science/article/pii/S0008622320311179?via%3Dihub

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