Ever since the first discovery of the mesoporous silica materials, membranes and templates with nanometer scaled pores have been anticipated as the potential applications of these and related materials. However, there have been several hurdles to overcome before such applications become possible. Some of the most important problems are the low reproducibility, the lack of controllability over the pore structure and the external morphology. Here in, we report reproducible synthesis method of meso-or nanoporous titania thin films with controls over internal and external structures. Using these thin films, we also have demonstrated the first example of nanoscopic membrane with size selectivity of 1 nm, and synthesized high density arrays of Pt and Ag nanoparticles within the nanopores.