Making graphene visible on transparent dielectric substrates: Brewster angle imaging

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dc.contributor.authorRomagnoli P.
dc.contributor.authorRosa H.G.
dc.contributor.authorLopez-Cortes D.
dc.contributor.authorSouza E.A.T.
dc.contributor.authorViana-Gomes J.C.
dc.contributor.authorMargulis W.
dc.contributor.authorDe Matos C.J.S.
dc.date.accessioned2024-03-13T00:56:21Z
dc.date.available2024-03-13T00:56:21Z
dc.date.issued2015
dc.description.abstract© 2015 IOP Publishing Ltd.The visibility of graphene is greatly increased by illuminating samples deposited on transparent dielectrics at the substrates' Brewster angle. Using a commercial ellipsometer, the reflectivity of monolayers of chemical vapour deposition (CVD) graphene is found to be up to 33 times higher than that of the substrate, i.e., an optical contrast as high as 3200% is obtained, more than 380 times higher than with standard optical microscopy. Also, with a simpler, homemade, experimental setup, a 1400% optical contrast was measured for a monolayer of CVD graphene and linear features as small as ~ 20 μmwere visible in a monolayer, while ~ 6 × 17 μm2 trilayers could still be imaged in exfoliated samples. It is also shown that the reflectance/transmittance ratio increases quadratically with the number of graphene layers, which may allow for counting layer numbers and identifying wrinkles and folds in transferred samples.
dc.description.issuenumber3
dc.description.volume2
dc.identifier.doi10.1088/2053-1583/2/3/035017
dc.identifier.issn2053-1583
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/36150
dc.relation.ispartof2D Materials
dc.rightsAcesso Restrito
dc.subject.otherlanguage2D materials
dc.subject.otherlanguageBrewster angle
dc.subject.otherlanguageGraphene
dc.subject.otherlanguageOptical contrast
dc.subject.otherlanguageTransparent substrate
dc.titleMaking graphene visible on transparent dielectric substrates: Brewster angle imaging
dc.typeArtigo
local.scopus.citations15
local.scopus.eid2-s2.0-84953216388
local.scopus.subjectBrewster angle
local.scopus.subjectChemical vapour deposition
local.scopus.subjectDielectric substrates
local.scopus.subjectGraphene layers
local.scopus.subjectLinear feature
local.scopus.subjectOptical contrast
local.scopus.subjectStandard optical microscopy
local.scopus.subjectTransparent substrate
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84953216388&origin=inward
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