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Wettability of partially suspended graphene

Abstract : 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.
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Thierry Ondarçuhu, Vincent Thomas, Marc Nuñez, Erik Dujardin, Atikur Rahman, et al.. Wettability of partially suspended graphene. Scientific Reports, Nature Publishing Group, 2016, 6, pp.24237. ⟨10.1038/srep24237⟩. ⟨hal-01712012⟩

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