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以Fe(acac)3为原料,乙二醇、聚乙二醇1000和聚乙二醇5000为还原剂和溶剂,在温和的溶剂热的条件下制备了不同尺寸的顺磁性Fe3O4纳米颗粒.利用X射线衍射(XRD)、光电子能谱(XPS)、透射电子显微镜(TEM)和磁性测量技术对制备的Fe3O4纳米颗粒的结构、形貌、磁性能进行了表征测试.结果发现,聚乙二醇分子链的长度对Fe3O4纳米颗粒的平均粒径大小、结晶度和饱和磁化强度均有重要影响.以乙二醇、聚乙二醇1000和聚乙二醇5000为还原剂制备的Fe3O4纳米颗粒的尺寸分别为2～3nm、5nm和7～8nm;相应的纳米Fe3O4颗粒饱和磁化强度分别为55.2、61.5和81.3emu/g;同时结晶度也随分子链的增加而增加.随分子链长度的增加,还原剂还原性的逐渐增加是导致Fe3O4纳米颗粒平均粒径大小、结晶度和饱和磁化强度逐渐增大的重要因素.
Fe (acac) 3 as raw materials, ethylene glycol, polyethylene glycol 1000 and polyethylene glycol 5000 as reductants and solvents, prepared in different conditions under mild solvent heating of paramagnetic Fe3O4 nanoparticles. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and magnetic measurements were used to characterize the structure, morphology and magnetic properties of the prepared Fe3O4 nanoparticles. The length of the molecular chain has an important effect on the average particle size, crystallinity and saturation magnetization of Fe3O4 nanoparticles. Fe3O4 nanoparticles prepared with ethylene glycol, polyethylene glycol 1000 and polyethylene glycol 5000 as reducing agents The sizes of the nanocrystalline Fe3O4nanoparticles were 2 ~ 3nm, 5nm and 7 ~ 8nm, respectively. The saturation magnetization of the corresponding Fe3O4 nanoparticles were 55.2, 61.5 and 81.3emu / g, respectively. Meanwhile, the crystallinity also increased with the increase of the molecular chain. , The reductant reductant gradually increases the average size of the resulting Fe3O4 nanoparticles, crystallinity and saturation magnetization is an important factor.