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Making Graphene Visible on Transparent Dielectric Substrates: Brewster Angle Imaging
Mackenzie Presbyterian University, Brazil.
Mackenzie Presbyterian University, Brazil.
Mackenzie Presbyterian University, Brazil.
Mackenzie Presbyterian University, Brazil.
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2015 (Engelska)Ingår i: Current Opinion in Chemical Engineering, E-ISSN 2211-3398, Vol. 2, nr 3, artikel-id 035017Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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 μm were visible in a monolayer, while ~6 × 17 μm2trilayers 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.

Ort, förlag, år, upplaga, sidor
2015. Vol. 2, nr 3, artikel-id 035017
Nyckelord [en]
2D materials, Brewster angle, Graphene, Optical contrast, Transparent substrate
Nationell ämneskategori
Materialteknik
Identifikatorer
URN: urn:nbn:se:ri:diva-25974DOI: 10.1088/2053-1583/2/3/035017Scopus ID: 2-s2.0-84953216388OAI: oai:DiVA.org:ri-25974DiVA, id: diva2:1131896
Tillgänglig från: 2017-10-13 Skapad: 2016-11-01 Senast uppdaterad: 2023-03-31Bibliografiskt granskad

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Margulis, Walter

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