Patent ID: 7612015

Claim:
A member having a photocatalytic function comprising: a substrate; an undercoat layer provided on said substrate, the undercoat layer including monoclinic zirconium oxide; and a photocatalyst layer formed on said undercoat layer, the photocatalyst layer including anatase type titanium dioxide, wherein said undercoat layer is crystalline, said photocatalyst layer is constituted of a crystalline phase, and no dead layer which is observed as a halo pattern in an electron diffraction image is substantially present between said undercoat layer and said photocatalyst layer, wherein an electron diffraction image obtained by perpendicularly irradiating a cross section of the undercoat layer includes an electron diffraction image from a (111) orientation plane or a (−111) plane of the monoclinic zirconium oxide, an interplanar spacing with respect to the (111) orientation plane measured by an electron diffraction image or by a bright-field image of a transmission electron microscope (TEM) is 2.6 to 3.0 Å, and an interplanar spacing with respect to the (−111) orientation plane measured by the an electron diffraction image or by a bright field image of a transmission electron microscope (TEM) is 3.0 to 3.5 Å, and wherein at least one of the distances between oxygen atoms in crystals which constitute the undercoat layer is in the range from 90 to 110%with respect to at least one of the distances between oxygen atoms in crystals which constitute the photocatalyst layer.