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Following the spectral energy shift of the energy gap (blue shift) of the TiO2 sol–gel derived films we have evaluated diameters of the nanocrystallites. The TiO2 films were deposited by dip-coating technique. Two types of mesoporous films were studied: films with porosity ~16% and refractive index (2.15 at wavelength 633 nm) and films with porosity ~46% and refractive index (1.61 at wavelength 633 nm)...
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