A scratch-resistant single-layer antireflective coating by a low temperature sol-gel route |
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Authors: | H. G. Floch P. F. Belleville |
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Affiliation: | (1) CEA Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint-Georges Cedex, France |
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Abstract: | A novel quarterwave-thick narrow-bandwidth antireflective coating has been developed for both plastic and vitreous substrates by a sol-gel route. This coating has revealed pronounced scratch- and climatic-resistance under adverse conditions. The single-layer coating consists basically of a composite material made of silica as the discontinuous phase and of a polytetrafluoroethylene-derived (Teflon1) organic polymer as the continuous phase. This leads to fluorine-containing colloidal silica product, or a so-called Flucosil coating. The coating is applied by spinning or dipping from specific solutions at room temperature followed by a mild and short heat treatment. In addition to remarkable abrasion and environmental resistance properties, such coatings have displayed excellent laser-induced damage threshold levels, surpassing uncoated substrates.We hope such a product might open new perspectives concerning household articles, architectural optical thin-films, ophthalmic uses, and so on. |
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Keywords: | antireflective coating colloid composite abrasion resistance environmental resistance |
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