Facile Synthesis of TiO_2 Nanocrystals Using NH_4F as Morphology-Controlling Agent and Its Influences on Photocatalytic Activity

摘要

Controllable synthesis of nanomaterials with different morphologies can significantly affect their properties. Here we report that the morphology and facet orientation of TiO_2 nanocrystals can be readily modulated via a hydrothermal method using a simple morphology-controlling agent of NH_4F. The photocatalytic activity of resultant TiO_2 has been evaluated by photodegradation of methyl orange. The results indicate that the introduction of NH_4F can be used to modulate the mophology and, thereby, the photocatalytic activity of TiO_2. The obtained TiO_2 with high-energy facet, small size, and large surface area can exhibit an improved photocatalytic efficiency, which may be promising for real application.