Photocatalytic coatings having improved low-maintenance properties
First Claim
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1. A transparent substrate on which there is provided a photocatalytic coating, the coating including a photocatalytic film deposited directly over an underlying film consisting essentially of tungsten oxide.
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Abstract
The invention provides a substrate bearing a photocatalytic coating. In some embodiments, the coating includes a photocatalytic film comprising titania deposited over a layer comprising tungsten oxide, aluminum oxide, niobium oxide or zirconium oxide. Additionally or alternatively, the photocatalytic film can include both titania and a material selected from the group consisting of nitrogen, tantalum, copper and silica. The invention also provides methods of depositing such coatings.
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29 Claims
- 1. A transparent substrate on which there is provided a photocatalytic coating, the coating including a photocatalytic film deposited directly over an underlying film consisting essentially of tungsten oxide.
- 8. A transparent substrate on which there is provided a photocatalytic coating, the coating including a photocatalytic film comprising titania positioned directly over a film consisting essentially of tungsten oxide.
- 16. A transparent substrate on which there is provided a photocatalytic coating, the coating comprising, from the substrate outwardly, a base film deposited over the substrate and having a thickness of less than about 300 angstroms, a film consisting essentially of tungsten oxide deposited over the base film and having a thickness of less than about 100 angstroms, and a photocatalytic film comprising titania deposited directly over the film consisting essentially of tungsten oxide.
- 18. A transparent substrate on which there is provided a photocatalytic coating, the coating including a photocatalytic film deposited over an underlying film consisting essentially of tungsten oxide, wherein a film comprising zirconium oxide or niobium oxide is deposited over or under the underlying film.
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