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Visible light responsive TiO2 photocatalyst coating: T16-086

Simple, low-cost, aesthetically pleasing, strong adhesion.

■Introduction of Tohoku University Technology Traditionally, the thermal oxidation of Ti produces rutile-type crystalline structure TiO2, which is said to not exhibit photocatalytic activity under visible light irradiation. On the other hand, it has been reported that the addition of Au to TiO2 shows photocatalytic activity in the visible light range. This invention enables the production of a precious metal-containing TiO2 coating film with photocatalytic activity responsive to visible light, having a crystalline structure of either rutile or anatase and a thickness of less than 1 μm, through a simple and low-cost method of thermally oxidizing a precious metal (Au, Ag, Pt, Pd) added precious metal-Ti substrate in the atmosphere or after carbonization of the Ti substrate in an Ar-CO atmosphere followed by thermal oxidation in the atmosphere. Other features of this invention include aesthetic surface quality and strong adhesion to the substrate. Furthermore, it is also possible to obtain a precious metal-containing TiO2 coating film after the thermal oxidation of Ti coated with a precious metal thin film using methods such as sputtering, which allows for a reduction in the amount of precious metal used.