Wettability of partially suspended graphene

The dependence of the wettability of graphene on the nature of the underlying substrate remains only partially understood. Here, we systematically investigate the role of liquid-substrate interactions on the wettability of graphene by varying the area fraction of suspended graphene from 0 to 95% by...

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Bibliographic Details
Published in:Scientific reports 2016-04, Vol.6 (1), p.24237-24237, Article 24237
Main Authors: Ondarçuhu, Thierry, Thomas, Vincent, Nuñez, Marc, Dujardin, Erik, Rahman, Atikur, Black, Charles T., Checco, Antonio
Format: Article
Language:English
Subjects:
140/133
639/301/357/918/1053
639/766/119/544
639/766/189
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Contact angle
Engineering Sciences
Humanities and Social Sciences
Hydrophobicity
Materials
multidisciplinary
Science
Substrates
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Summary:The dependence of the wettability of graphene on the nature of the underlying substrate remains only partially understood. Here, we systematically investigate the role of liquid-substrate interactions on the wettability of graphene by varying the area fraction of suspended graphene from 0 to 95% by means of nanotextured substrates. We find that completely suspended graphene exhibits the highest water contact angle (85° ± 5°) compared to partially suspended or supported graphene, regardless of the hydrophobicity (hydrophilicity) of the substrate. Further, 80% of the long-range water-substrate interactions are screened by the graphene monolayer, the wettability of which is primarily determined by short-range graphene-liquid interactions. By its well-defined chemical and geometrical properties, supported graphene therefore provides a model system to elucidate the relative contribution of short and long range interactions to the macroscopic contact angle.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep24237