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Free-standing titania films were grown at the air-water interface, a novel method to synthesize robust TiO2 nanowire/nanoparticle composite films. The calcined films contain an anatase crystal phase and have a high surface area with a structure composed of one-dimensional long nanowires and mesoporous nanoparticle branches. These suggest a promising way to manufacture large areas of thick porous titania films for many applications. As one possible application, use of these films in a dye-sensitized solar cell demonstrates the potential of these materials. (Figure Presented).