| 초록 |
Design of the isolated ion, cluster size and/or nano-particle size catalysts within the silica-based porous materials such as microporous zeolite and mesoporous silica is very attractive.The isolated and tetrahedrally coordinated metal oxide (Ti, V, Cr , Mo and W-oxides) moieties can be included in the matrixes of silica-based microporous and mesoporous materials and named as “single-site photocatalysts”.Under UV-light irradiation these single-site photocatalysts form the charge transfer excited state, i.e., the excited electron-hole pair state which localize quite near to each other in different from the manner observed on semiconducting materials such as TiO2.These single-site photocatalysts not only can promote unique photocatalytic reactions but also can be utilized to synthesis of functional materials.The nano-sized metal catalysts and visible-light sensitive binary oxide photocatalysts can be synthesized on the excited single-site photocatalysts under UV-light irradiation.The transparent mesoporous silica thin film with single-site photocatalysts generates the super-hydrophilic surface.In this presentation, our recent applications of single-site photocatalysts are introduced. |
