The stable lotus-leaf-like superhydrophobic copper was fabricated by means of a very simple and industrially up scalable method. Under both the growth of CuO microcrystals on the surface and the chemical modification, the wettability of the copper substrate changed from hydrophilic to water-repellent superhydrophobic, with surface hierarchical structures similar to that of lotus leaf.
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The employed method, herein, is as follows. A copper plate was immersed in a aqueous solution of and KOH at for about . The immersed copper plate was rinsed with de-ionized water thoroughly, then oven dried at for . The treated sample was then coated with poly (dimethylsiloxane) vinyl terminated (PDMSVT) (purchased from Sigma-Aldrich) and 184 curing agent as the cross-linker (purchased from Dow Corning Company), finally cured in a heater at about for about . The modified film was obtained by spin coating at a speed of for . For more details, please see the supporting information.
