Contact angle measurement of free-standing square-millimeter single-layer graphene

Anna V. Prydatko, Liubov A. Belyaeva, Lin Jiang, Lia M. C. Lima and Grégory F. Schneider ()
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Anna V. Prydatko: Leiden University
Liubov A. Belyaeva: Leiden University
Lin Jiang: Leiden University
Lia M. C. Lima: Leiden University
Grégory F. Schneider: Leiden University

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract Square millimeters of free-standing graphene do not exist per se because of thermal fluctuations in two-dimensional crystals and their tendency to collapse during the detachment from the substrate. Here we form millimeter-scale freely suspended graphene by injecting an air bubble underneath a graphene monolayer floating at the water–air interface, which allowed us to measure the contact angle on fully free-standing non-contaminated graphene. A captive bubble measurement shows that free-standing clean graphene is hydrophilic with a contact angle of 42° ± 3°. The proposed design provides a simple tool to probe and explore the wettability of two-dimensional materials in free-standing geometries and will expand our perception of two-dimensional materials technologies from microscopic to now millimeter scales.

Date: 2018
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DOI: 10.1038/s41467-018-06608-0

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