prov:value
| - In addition, metals such as Fe, Co, Ni, Cu, Zn, V, Cr, Nb, Mo, Ta, W, Al, Si, Sn and the like and the oxides of the above-described metals can be doped into the titanium-based oxide film 4 to improve the photocatalytic activity in the range where the optical characteristics of the film is not extremely changed. [0031] (3) Primer Film [0032] A primer film 6 is composed of two layers consisting of a
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