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Making Graphene Visible on Transparent Dielectric Substrates: Brewster Angle Imaging
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2015 (English)In: 2D Materials, ISSN 2053-1583, Vol. 2, no 3Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
2015. Vol. 2, no 3
Keywords [en]
graphene
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-25974OAI: oai:DiVA.org:ri-25974DiVA, id: diva2:1131896
Available from: 2017-10-13 Created: 2016-11-01 Last updated: 2017-12-04Bibliographically approved

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