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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._x000D_ Also, with a simpler, homemade, experimental setup, a 1400% optical contrast was measured for a monolayer of CVD graphene linear features as small as ~20 Î¼m were visible in a monolayer, while ~6 Ã— 17 Î¼m2trilayers could still be imaged in exfoliated samples._x000D_ It is also shown that the reflectance/transmittance ratio increases quadratically with the number of graphene layers, which may allow for counting layer numbers identifying wrinkles folds in transferred samples._x000D_

Place, publisher, year, edition, pages
2015. Vol. 2, no 3
Keywords [en]
graphene
National Category
Computer and Information Sciences
Identifiers
URN: urn:nbn:se:ri:diva-31886OAI: oai:DiVA.org:ri-31886DiVA, id: diva2:1151744
Available from: 2017-10-24 Created: 2017-10-24 Last updated: 2018-01-13Bibliographically approved

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