表面活性剂辅助水热合成氧化钛纳米针溶胶

Preparation of TiO_2 Nanoneedles Sol via Surfactant Assisted Hydrothermal Synthesis

纳米晶二氧化钛作为一种宽带半导体材料．具有优异的光学和电学性能，在光催化剂川、太阳能电池、传感器和微孔薄膜等方面有广泛应用．成为最近几十年研究最多的氧化物之一。而形貌和尺寸可控的TiO2，特别是一维纳米材料，如纳米棒、纳米线和纳米管，由于其独特的结构特性而具有特殊的电学、光学、磁学和机械性能。因而成为研究的热点。

TiO2 nanoneedles sol with particle size of 10-15 nanometer was synthesized by hydrothermal method using peroxo titanic acid as the precursor, cetyltrimethyl ammonium bromide （CTAB） as the surfactant. The product was characterized by XRD, TEM, HRTEM and selected area electron diffraction（SAED）. The results show that the as-prepared products have high crystallinity and good monodispersity. In addition, TiO2 hydrosol and grow along the c-axis, with homogeneous morphology possessed good photocatalytic activity for the photocatalytic degradation of methyl orange aqueous solution under the sunlight illumination.