单分散Fe3O4纳米颗粒的控制合成和表征

以十八烯为溶剂、乙酰丙酮铁为铁源，并在油酸、油胺的辅助作用下，通过热分解法成功合成了单分散Fe3O4纳米颗粒。讨论了实验参数如反应温度、表面活性剂的量和种类、溶剂、油酸、油胺对单分散Fe3O4纳米颗粒的尺寸及形貌的影响。利用X射线衍射（XRD）、透射电子显微镜（TEM）、选区电子衍射（SAED）和高分辨透射电子显微镜（HRTEM）对所得产物的物相、结构、尺寸和形貌进行了表征分析。通过振动样品磁强计（VSM）表征产物磁性能，表明在室温下，Fe3O4纳米颗粒的饱和磁化强度（Ms）和矫顽力（Hc）分别为74.0 emu/g，72.6 Oe。

Controlled Synthesis and Characterization of Monodisperse Fe3O4 Nanoparticles

Monodisperse Fe₃O₄ nanoparticles were successfully synthesized through the thermal decomposition of iron acetylacetonate in octadecene solvent in the presence of oleic acid and oleylamine. The influences of experimental parameters, such as reacting temperature, amounts and kinds of surfactants, solvents, oleic acid and oleylamine, on the size and shape of monodisperse Fe₃O₄ nanoparticles were discussed. The phase structures, morphology, and size of the as‐prepared products were investigated in detail by X‐ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and high‐resolution transmission electron microscopy (HRTEM). Magnetic property was measured using a vibrating sample magnetometer (VSM) at room temperature, which revealed that Fe₃O₄ nanoparticles were of ferromagnetism with a saturation magnetization (M_s) of 74.0 emu/g and coercivity (H_c) of 72.6 Oe.