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• W2019707200 abstract "SiO2 amorphous thin films containing two different concentrations of copper-based colloidal particles were prepared by the sol–gel method. Thermal treatments in air at 350°C result in the segregation of cupric oxide particles. Subsequent reducing treatments in a CO atmosphere at 300 and 500°C for one hour partially reduces the cupric oxide into particles with metallic copper as the main component. The optical properties of the reduced films were characterized measuring the optical absorption spectra as a function of the elapsed time after the reduction process. The absorption data were analyzed in terms of the Mie model for colloidal systems. The fitting of this model to the experimental data provides the temporal evolution of the volume fractions of the three components of the colloidal particles, that is; Cu, Cu2O and CuO. It is found that the exposure to air of the films treated at 300°C under the reducing atmosphere, results in a gradual reoxidation of the colloidal particles modifying their chemical composition and therefore the optical properties of the composite film. On the other hand, the reduction treatment at 500°C results in the stabilization of the composition of the colloidal particles, producing stable films with a high optical density." @default.
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• W2019707200 date "2000-04-01" @default.
• W2019707200 modified "2023-10-18" @default.
• W2019707200 title "Stabilization of copper-based colloidal particles in sol–gel SiO2 thin films" @default.
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• W2019707200 doi "https://doi.org/10.1016/s0040-6090(99)01084-6" @default.
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