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The effect of Fe ion concentration on the morphological, structural, and optical properties of TiO 2  films supported on silica (SiO 2 ) opals has been studied. TiO 2 :Fe 2 O 3  films were prepared by the sol-gel method in combination with a vertical dip coating procedure; precursor solutions of Ti and Fe were deposited on a monolayer of SiO 2  opals previously deposited on a glass substrate by the same procedure. After the dip coating process has been carried out, the samples were thermally treated to obtain the TiO 2 :Fe 2 O 3 /SiO 2  composites at the Fe ion concentrations of 1, 3, and 5 wt%. Scanning electron microscopy (SEM) micrographs show the formation of colloidal silica microspheres of about 50 nm diameter autoensembled in a hexagonal close-packed fashion. Although the X-ray diffractograms show no significant effect of Fe ion concentration on the crystal structure of TiO 2 , the μ-Raman and reflectance spectra do show that the intensity of a phonon vibration mode and the energy bandgap of TiO 2  decrease as the Fe +3  ion concentration increases.

Fe effect on the optical properties of TiO2:Fe2O3 nanostructured composites supported on SiO2 microsphere assemblies