Alkali concentration-dependent tailoring of highly controllable titanate nanostructures: From yolk-shell, hollow 3D nanospheres to 1D nanowires

Abstract We demonstrate a facile strategy to access 0D nanoparticles to 3D hierarchical structures through a hydrothermal process. The morphology of the products is alkali concentration-dependent, which was systematically investigated. As the NaOH concentration rising, morphology transformations from yolk-shell, hollow hierarchical 3D nanospheres to 1D nanowires are achieved. The crystal phase, the transformation relationship, and the formation mechanisms were studied as well. Furthermore, TiO 2 with diversified morphologies was evaluated as styrene oxidation catalyst and showed excellent catalytic activities and chemical stability.