Abstract
In this paper, we study the electrowetting character on ZnO nanowires. We grow the ZnO nanowires on indium tin oxide (ITO) by a hydrothermal method, and the ZnO nanowires surface is further hydrophobized by spin-coating Teflon. Such a prepared surface shows superhydrophobic properties with an initial contact angle 165°. When the applied external voltage between the ITO and the sessile droplet is less than 50 V, the contact angle continuously changed from 165° to 120°, and exhibits instant reversibility. For a slightly higher voltage, a mutation of the contact angle changing to 100° was observed and the contact angle was not reversible after removing the applied voltage, which indicates a transition from non-wetting state to wetting state. Further increasing of the applied voltage, the apparent contact angle decreased to an invariable value 70°, and electrical breakdown emerged synchronously.
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Wu, J., Xia, J., Lei, W. et al. Electrowetting on ZnO nanowires. Appl. Phys. A 99, 931–934 (2010). https://doi.org/10.1007/s00339-010-5697-x
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DOI: https://doi.org/10.1007/s00339-010-5697-x