Abstract
Abstract nc-TiO 2 /SnO 2 photonic crystal composite membranes were prepared by depositing nanocrystalline TiO 2 layers on top of inverse opal SnO 2 photonic crystals films. The photonic band gap of the SnO 2 photonic crystals layer was tuned by changing the particles size of polystyrene microspheres. Photons trapped in the SnO 2 photonic crystal layer are more effectively absorbed by TiO 2 at the TiO 2 /SnO 2 interface creating photoelectrons that assist in oxidation reactions. It was shown that the closer the photonic band gap of the phonic crystals layers matches the electronic band gap of TiO 2 catalyst layer, the higher the photocatalytic activity of the composite membranes. The photo-activity of TiO 2 can be enhanced by the synergistic effect of photonic crystal light localization at the SnO 2 /TiO 2 interface.
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