Abstract
AbstractCr‐doped TiO2/SiO2 nanostructured materials were prepared employing a layer‐by‐layer assemblym technique. TiO2 colloids were synthesized by a sol‐gel method using TiCl4 as a precursor. The experimental results showed that sphere‐type TiO2 particles on SiO2 exhibited uniform shape and a narrow size distribution. The amount of Ti (wt %) increased as a function of the number of the coating layers. The coatingv layers was composed of anatase titania nanocrystals at 550 °C. The onset of band‐gap transition for Crdoped TiO2/SiO2 showed a red shift compared with that for the undoped TiO2/SiO2. And the photocatalytic activity of Cr‐doped TiO2/SiO2 was higher than that of undoped sample.
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