Abstract
The formation of small gold colloids in SiO 2TiO 2 sol-gel films on soda-lime glass was investigated using ultraviolet-visible (UV-VIS) sectroscopy and electron microscopy. Conventional thermal reduction of gold ions in sol-gel films tended to form large particles due to growth or aggregation causing a hazy appearance in the high concentration range. It was found that a haze-free deep blue tinted film could be prepared by UV irradiations of the dried gel film before annealing at 500°C. Colloids with a narrow size distribution were formed in this film. Sufficient photoreduction of metallic species from gold salts is a key factor for the excellent coloration.
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