Surfactant Templated Sol-Gel Process for Synthesis of Mesoporous Titanium Dioxide Thin Films скачать в хорошем качестве

Surfactant Templated Sol-Gel Process for Synthesis of Mesoporous Titanium Dioxide Thin Films

Surfactant templated sol-gel process for synthesis of mesoporous titania thin films. A surfactant is used for pore formation in the metal oxide. A surfactant is a block co-polymer. To synthesis of titania dioxide which is called titania, a surfactant and the titania precursors are mixed together as shown in the beaker. The red round shape particle indicates the surfactant molecule, and the yellow solution indicates the titania precursors dissolved in a solvent such as ethanol. A substrate such as glass is dip coated in the solution. After dip coating, the film is kept in a refrigerator at 4 deg. C temperature and 94% relative humidity. During this aging process, the surfactants form a cylindrical micelles. It takes about 2 hours for complete self-assembly of the micelles with certain structure such as hexagonal closed pack. Then the film is annealed at about 400 deg. C temperature to remove the surfactants which leaves permanent pores in the titania thin film. There are several advantages of this surfactant templated sol-gel process. For example, it is a scalable process. It provides high surface area which is essential for its applications such as photocatalysis. The films can be deposited on a variety of substrates with varying geometry. It’s easy to obtain desired properties such as pore size, shape, and porosity. Finally, the thickness of the film can be easily controlled.