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采用溶胶-凝胶技术,通过酸/酸二步法控制实验条件,以正硅酸乙酯(TEOS)为硅源,、Fe(NO_3)_3·9H_2O为铁源,制备了磁性Fe_2O_3-SiO_2介孔纳米复合薄膜。用表面活性剂十六烷基三甲基溴化氨(CTAB)为模板剂,在酸性条件下产生介孔结构,再经热处理去除CTAB。借助小角射线衍射和振动样品磁强计研究了薄膜的介孔结构和磁性能。薄膜的饱和磁化强度随着热处理温度的升高而增大。磁化强度测最结果显示制备的磁性Fe_2O_3-S1O_2介孔纳米复合薄膜是正规的铁磁体。CTAB对薄膜的磁性起着关键的作用。扫描电镜显示制备的薄膜均匀。
The sol-gel technique was used to prepare the magnetic Fe_2O_3-SiO_2 medium by the acid / acid two-step method and the Fe (NO_3) _3 · 9H_2O as the source of silicon with tetraethoxysilane (TEOS) Hole nano-composite film. The surfactant Cetyltrimethylammonium Bromide (CTAB) is used as a template to produce mesoporous structures under acidic conditions, and then CTAB is removed by heat treatment. The mesoporous structure and magnetic properties of the films were investigated by means of small-angle X-ray diffraction and vibrating sample magnetometers. The saturation magnetization of the film increases with the increase of the heat treatment temperature. The results of magnetization show that the prepared magnetic Fe_2O_3-S1O_2 mesoporous nanocomposite films are regular ferromagnets. CTAB plays a key role in the magnetism of the film. Scanning electron microscopy showed that the prepared film was uniform.