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在不使用表面活性剂的条件下,以K3Fe(CN)6为铁源,采用溶剂热合成技术,于200℃反应24h得到亚微球状的Fe3O4.产物的物相、微观形貌、结构和表面元素状态分别采用X射线衍射仪、场发射扫描电子显微镜、透射电子显微镜和X射线光电子能谱等进行了表征.结果表明,产物为面心立方结构、具有单分散性的Fe3O4亚微球,平均直径为170nm.通过一系列对比实验研究了反应参数对产物的影响,发现作为还原剂和溶剂的乙二醇在合成中起着关键的作用;此外,反应时间和反应温度也对最终产物产生重要影响.所得近单分散的Fe3O4亚微球在室温条件下的磁滞回线表现出铁磁行为,其饱和磁化率为60.8emu/g,矫顽力为124.7Oe.
Without surfactant, K3Fe (CN) 6 was used as iron source and solvothermal synthesis technique was used to obtain submicrospherical Fe3O4 after reaction at 200 ℃ for 24 h.The phase, microstructure, surface and surface of the product The elemental states were characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy, respectively. The results showed that the product was a face-centered cubic structure with monodisperse Fe3O4 submicrospheres, Diameter of 170nm.A series of comparative experiments were conducted to study the influence of the reaction parameters on the product, and it was found that ethylene glycol as a reducing agent and a solvent played a key role in the synthesis. In addition, the reaction time and the reaction temperature were also important for the final product .The hysteresis loops of the resulting nearly monodisperse Fe3O4 submicrospheres at room temperature show a ferromagnetic behavior with a saturation magnetization of 60.8emu / g and a coercivity of 124.7Oe.