A Facile Method for Synthesizing TiO₂ Sea-Urchin-Like Structures and Their Applications in Solar Energy Harvesting

We present a new method to prepare TiO₂ sea−urchin-like structures, which involves the initial formation of tubular nanostructures and subsequent self-assembly of the nanotubes into micrometer-scale sea-urchin-like structures. We also investigate the important role of alkali aqueous conditions in the preparation of TiO₂ sea−urchin-like structures. This facile and cost-effective approach provides a new route for the preparation of self-assembled TiO₂ structures. In addition, the performance of the as−synthesized TiO₂ sea-urchin-like structures as the active layer of an efficient solar energy harvester is also studied and discussed.