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Volume 199, 2017
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Electrowetting on conductors: anatomy of the phenomenon

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We have recently reported that reversible electrowetting can be observed on the basal plane of graphite, without the presence of a dielectric layer, in both liquid/air and liquid/liquid configurations. The influence of carbon structure on the wetting phenomenon is investigated in more detail here. Specifically, it is shown that the adsorption of adventitious impurities on the graphite surface markedly suppresses the electrowetting response. Similarly, the use of pyrolysed carbon films, although exhibiting a roughness below the threshold previously identified as the barrier to wetting on basal plane graphite, does not give a noticeable electrowetting response, which leads us to conclude that specific interactions at the water–graphite interface as well as graphite crystallinity are responsible for the reversible response seen in the latter case. Preliminary experiments on mechanically exfoliated and chemical vapour deposition grown graphene are also reported.

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The article was received on 12 Dec 2016, accepted on 23 Jan 2017 and first published on 23 Jan 2017

Article type: Paper
DOI: 10.1039/C6FD00252H
Faraday Discuss., 2017,199, 49-61

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    Electrowetting on conductors: anatomy of the phenomenon

    K. Ounnunkad, H. V. Patten, M. Velický, A. K. Farquhar, P. A. Brooksby, A. J. Downard and R. A. W. Dryfe, Faraday Discuss., 2017, 199, 49
    DOI: 10.1039/C6FD00252H

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