软模板法制备Fe3O4空心结构微球

以FeCl3×6H2O和NH4Ac为反应物，乙二醇为溶剂热介质，制备了Fe3O4空心结构微球. 通过X射线衍射、场发射扫描电子显微镜、透射电子显微镜和振动样品磁强计对产物的结构、形貌及磁性能进行了表征，并研究了反应温度和反应时间对产物形貌的影响，得出了制备Fe3O4空心结构微球适宜的反应温度为200℃，反应时间为12 h. 此条件下得到的产物形貌均匀且表面光滑，平均粒径约为400 nm，具有铁磁性，饱和磁化强度为73.51 emu/g. 反应过程中原位产生的氨气气泡是空心结构Fe3O4微球形成的软模板，该方法是制备空心结构微球的一种简单有效途径.

Synthesis of Fe3O4 Microspheres with Hollow Structure by Soft Template Method

Fe3O4 microspheres with hollow structure were prepared by the glycol solvothermal method using FeCl3×6H2O and NH4Ac as reactants. The structure, morphology and magnetism property of synthesized Fe3O4 were characterized using XRD, SEM, TEM and VSM. The effects of reaction time and temperature on the morphology of product were also studied. It is revealed that 200℃ and 12 h were suitable synthetic parameters for the particles with morphology being uniform and high dispersion at an average size about 400 nm. The product obtained exhibits a ferromagnetic behavior with saturation magnetization value of 73.51 emu/g. It is not only a simple but also effective approach to synthesize Fe3O4 microspheres with hollow structures in one step using ammonia bubbles generated in situ as soft template.