Berlin 2015 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 22: Interfaces and Thin Films III (joint session with CPP)
DS 22.2: Vortrag
Mittwoch, 18. März 2015, 09:45–10:00, C 243
Transparent aluminium oxide coatings on polymer substrate — •Samantha Micciulla1, Xiaofei Duan2, Robert N. Lamb2, and Regine von Klitzing1 — 1Technische Universitaet Berlin — 2The University of Melbourne
Smart coatings are highly versatile systems, applicable to diverse purposes and finely tunable by proper external stimuli. Polymers are mostly used to create responsive films, however they suffer hard conditions like high temperatures, aggressive chemicals, high mechanical stress, with consequent degradation or irreversible modifications. Therefore the use of a thin inorganic coating enriching the system of high mechanical and chemical stability may be the solution to this limitation. A good candidate to this purpose is aluminium oxide (Al2O3), which presents anti-corrosion properties, high wear resistance, and high biocompatibility. Moreover, the transparency of alumina ceramics in the UV-Vis range makes it suitable to optical applications. A synthetic route to prepare Al2O3 was developed to reduce the risk of degradation of the underneath polymer, using low temperatures and mild chemicals. The composition of alumina/polymer coatings was studied by X-Rays Photoelectron Spectroscopy and the surface morphology by Scanning Electron Miscoscopy. The latter showed the achievement of a smooth, cracks-free coating upon hydrothermal treatment (105∘C, 38 atm). Our studies focused on the preparation of alumina coatings on polymer substrates having different surface hydrophilicity, charge and structure, and revealed that the wetting properties of the polymer surface play the dominant role for the quality of the coating.