通过β-FeOOH纳米棒无序聚集制备α-Fe_2O_3中空球

Preparation of α-Fe_2O_3 Hollow Spheres via Random Aggregation of β-FeOOH Nanorods

近年来．纳米材料的制备研究中的热点之一是各种中空独立几何结构的构筑^[1],这是由于中空结构除了可用来构建复杂结构量子器件外,还具有比表面积大、密度低和稳定性好等特点,因此在光子器件、药物载体、材料封装和催化剂载体等方面也有着广泛的应用嘲。通过严格控制液相体系条件，

The α-Fe2O3 hollow spheres have been synthesized through the random aggregation of β-FeOOH nanorods in the C2HsOH/H2O system. The phase transformation and the morphologies of the α-Fe2O3 hollow structure were investigated with XRD, SEM, TEM and selected area electron diffraction （SAED）. These studies indicate that the second step is a dissolution-recrystallization process. Furthermore, the formation mechanism of the hollow spheres has been discussed. It is found that the presence of H20 in the reaction system is essential to the final formation of the hollow spheres.