本文以正硅酸乙酯(TEOS)、Fe(NO_3)_3·9H_2O、无水乙醇(Eth)、盐酸(HCl)和去离子水作为原料,以十六烷基三甲基溴化铵(CTAB)为模板剂,采用溶胶-凝胶法制备了纳米γ-Fe_2O_3/SiO_2复合材料.主要研究了CTAB、热处理温度以及Fe_2O_3的浓度对纳米γ-Fe_2O_3/SiO_2复合材料的形成及磁性能的影响.用X射线衍射分析(XRD)对纳米粒子进行表征以及用Quantum Design Model物理性质测量系统(PPMS)测量纳米颗粒的零场冷却(ZFC)和加场冷却(FC)时的磁化强度随温度的变化关系.通过对XRD衍射图和ZFC/FC曲线分析,可知制备纳米γ-Fe_2O_3/SiO_2复合材料最佳热处理温度为700℃左右,Fe_2O_3最佳浓度为30wt%左右.尤其加CTAB改性后,所得的纳米γ-Fe_2O_3/SiO_2复合材料较纯正和表现出超顺磁性.
In the paper, the γ-Fe_2O_3/SiO_2 nano-composites were prepared by the sol-gel method using TEOS、Fe (NO_3)_3 9H_2O、Eth、HCl and deionized water as raw materials and CTAB as template. It is showed that CTAB、 heat treatment temperature and content of Fe_2O_3 are crucial factors for the formation and magnetic properties of the γ-Fe_2O_3/SiO_2 nano-composites. nano-composites is characterized by X-ray diffraction (XRD) and the relation between magnetization and Temperature about ZFC and FC curve is measured by Quantum Design Model Physical Properties Measurement System(PPMS). The result indicated that the preferable heat treatment temperature is a-bout 700℃, the content of Fe_2O_3 is about 30wt% and especially after the modification of CTAB, the γ-Fe_2O_3/SiO_2 nano-composites prepared are pure and show superparamagnetism.
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