Photocatalyst element, method and device for preparing the same
US7799731B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2002 |
| Grant date | Sep 21, 2010 |
| Priority date | — |
| Expiry date | Feb 20, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/86
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A photocatalyst according to the invention comprises a photocatalytic film of a compound of titanium and oxygen and is characterized in that the photocatalytic film is made porous and has 0.02 or higher value as a value calculated by dividing the arithmetical mean deviation of profile Ra with the film thickness. The photocatalytic film can also be specified by the intensity ratio between x-ray diffraction peaks of the anatase structure of titanium oxide. Such a porous photocatalytic material can be obtained by a reactive sputtering method in conditions of adjusting film formation parameters such as the film formation rate, the sputtering pressure, the substrate temperature, the oxygen partial pressure and the like in proper ranges, respectively, and the photocatalyst material is provided with excellent decomposition and hydrophilization capability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.