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- Title
Preparation of black-colored thin films from silica sol containing dissolved metal nitrates by the sol-gel method.
- Authors
Akamatsu, Y.; Takamatsu, A.; Makita, K.; Inaba, H.; Minami, T.
- Abstract
Black-colored SiO2-based films, containing colorant inorganic spinel crystals such as Cu2MnO4, CuMn2O4, CuMnCrO4, CuMnFeO4 or CuMnCoO4, were prepared from a silica sol containing dissolved metal nitrates using the dipping-withdrawing technique. The inorganic colorants were formed in the SiO2 matrix of the films by heat-treatment at temperatures from 600 to 660°C. The black-colored coating films were uniform and transparent with a low haze value (less than 1.0%) and with a thickness of 100–800 nm in the SiO2-(Cu-Mn-Cr-O) system, for which the colorant was the spinel crystal of CuMnCrO4. The visible light transmittance of the colored films was controlled in a relatively wide range of 15–65% by changing the film thickness or the colorant concentration in the coating solution. Optimization of the composition of the coating solution and the preparation conditions gave black-colored films with excellent durability and visible light transmittance of about 25%, which is similar to that of deeply black-colored glasses commonly produced by the melting method. For example, a black-colored film with a visible light transmittance of 24.6% and a film thickness of 160 nm was obtained from a coating solution with a nominal composition of 36SiO2·64CuMnCrO4. The durabilities of the glasses with black-colored coatings against scratching, abrasion and chemicals are good enough for the practical applications.
- Subjects
THIN films; OPTICAL properties; THERMAL properties of surface coatings; GLASS coatings; SILICA gel; SPINEL; NITRATES
- Publication
Journal of Materials Science, 2001, Vol 36, Issue 18, p4503
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1023/A:1017990921511