Formation of Highly Ordered Mesoporous Titania Films Consisting of Crystalline Nanopillars with Inverse Mesospace by Structural Transformation

摘要

This paper reports a very unique structural transformation process for a new nanostructured titania film consisting of high-density anatase nanopillars with open-spaced,perpendicular,and continuous porosity (referred to as inverse mesospace).Ordered crystalline mesoporous titania films have been synthesized by utilizing surfactants as structure-directing agents,and these materials have received great interests because of their adsorption abilities and semiconducting properties.The mesostructures reported so far have included 2D hexagonal with mesochannels running parallel to substrates and 3D cubic structures.Although these mesostructures exhibit ordered pore size and high surface area,the lack of perpendicular porosity greatly reduces the merit of the films.Therefore,the crystalline titania films with perpendicular porosity have been highly demanded because this pore configuration should increase the accessibility and enhance the efficiencies of adsorption and catalysis.