Enhanced Optical Absorption Induced by Dense Nanocavities inside Titania Nanorods

Dense polyhedral nanocavities inside single-crystalline anatase TiO2 nanorods are successfully synthesized by simply heating H2Ti3O7 nanorods. The size of the nanocavities is typically about 10 nm. The surfaces of the nanocavity polyhedron are determined to be the crystallographic low-index planes of the TiO2 crystal (see figure).