Organic-inorganic hybrid materials and processes for preparing the same

An organic-inorganic hybrid material comprising a substrate, the first intermediate layer, the second intermediate layer, and a photo-catalysis layer which are sequentially formed on a surface of the substrate wherein:

• the first intermediate layer is composed of an organic-inorganic hybrid polymer material in which an organic polymer component and a metal oxide component are covalently bonded to each other, which is obtained by hydrolyzing and polycondensing a solution or a wet gel which comprises an organic polymer having an alkoxymetal group as a functional group or an organic polymer having a functional group reactable with a metal alkoxide compound, and a metal alkoxide compound,
• the second intermediate layer is composed of metal oxide which is obtained by hydrolyzing and polycondensing a metal alkoxide compound, and
• the photo-catalysis layer is composed of metal oxides having photo-catalysis.

An organic-inorganic hybrid material comprising a substrate, an intermediate layer and a photo-catalysis layer which are sequentially formed on a surface of the substrate wherein:

• the intermediate layer is composed of an organic-inorganic hybrid component-gradient polymer material in which an organic polymer component and a metal oxide component are covalently bonded to each other, and content of the metal oxide component is increased from the substrate in the direction of the photo-catalysis layer, and
• the photo-catalysis layer is composed of metal oxides having photo-catalysis.

An organic-inorganic hybrid material comprising a substrate, the first intermediate layer, the second intermediate layer, and a photo-catalysis layer which are sequentially formed on a surface of the substrate wherein:

• the first intermediate layer is composed of an organic-inorganic hybrid component-gradient polymer material in which an organic polymer component and a metal oxide component are covalently bonded to each other, and content of the metal oxide component is increased from the substrate in the direction of the second intermediate layer,
• the second intermediate layer is composed of metal oxide which is obtained by hydrolyzing and polycondensing a metal alkoxide compound, and
• the photo-catalysis layer is composed of metal oxides having photo-catalysis.

A process for preparing an organic-inorganic hybrid material comprising the steps of:

• (i) providing a substrate having a surface;
• (ii) applying a solution or a wet gel which comprises an organic polymer having an alkoxymetal group as a functional group or an organic polymer having a functional group reactable with a metal alkoxide compound, and a metal alkoxide compound on the surface of the substrate to form an intermediate layer;
• (iii) forming a photo-catalysis layer which is composed of a material comprising metal oxide having photo-catalysis on the surface of the intermediate layer.