Fabrication of superhydrophobic nanostructured films by Physical Vapour Deposition
نویسندگان
چکیده
This work reports on recent advances in the deposition of non-wettable coatings with high water contact angles (WCAs). We propose a simple and easily-controlled method for fabricating different types of nanoestructured films of Al2O3 with hydrophobic properties by Physical Vapour Deposition (PVD). The films have been deposited over three types of hydrophilic substrates with very different values of roughness and free surface energy. The results of this study showed that the hydrophobicity of the Al2O3 coatings do not depend on the starting conditions of the substrate. GD-OES and FESEM showed a 50-250 nm surface flake structure of Al2O3. This surface flake structure, which is responsible of the hydrophobic effects, is optimized in thicker films. These Al2O3 hydrophobic films presented similar values of contact angle in water to the classic polymeric films based on methyl and fluorocarbons groups.
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