| 摘要 |
PROBLEM TO BE SOLVED: To provide a photocatalytic particle in which photocatalytic characteristics are excellent, especially in a visible light range. SOLUTION: The photocatalytic particle 1 is equipped with a titanium oxide particle 2 and at least one kind of metal selected from silver, copper, zinc and nickel or alloy 3 which covers the surface 2a of the titanium oxide particle 2 so that a part of the surface 2a of the particle 2 is exposed. The diameter of the particle 2 is <=1 μm. Photocatalytic activity of titanium oxide is developed in the especially exposed part because a part of the surface 2a of the particle 2 is exposed. Since the photocatalytic particle 1 is equipped with at least one kind of metal selected from silver, copper, zinc and nickel or alloy 3, it is easily excited by irradiation of light in a visible region and an electron and a positive hole are generated. Such a state is caused that movement or the electron and the positive hole is enabled between metal or alloy 3 and the particle 2 in the covered parts. Therefore, the electron of the positive hole generated in metal or alloy is supplied to titanium oxide. Further, since particle diameter of titanium oxide is <=1 μm, quantum size effect arises. |
