单分散Fe_3O_4纳米粒子的合成、表征及其自组装

Synthesis,characterization and self-assembly of monodispersed Fe_3O_4 nanoparticles

采用高温有机前驱体分解法,以Fe(acac)3为前驱体制备出单分散性较好的Fe3O4纳米粒子,粒径为(6.4±0.90)nm。利用TEM、XRD、HPPS、FTIR等手段对粒子的形貌及性质进行了研究,证实得到的是Fe3O4单晶,粒子表层的铁原子通过共价键和油酸分子中—COO的两个氧原子结合在一起。通过对自组装过程的初步研究表明随磁性纳米粒子浓度的增加,粒子排布逐渐由零星的无规排列变为规整的单层和多层有序结构。

Monodisperise Fe3O4 nanoparticles with narrow size distribution were synthesized by a high-temperature solution-phase method. The diameter of the as-synthesized nanoparticles is （6.4±0.90）nm. Studied the shape and character of the as-synthesized nanoparticles by TEM, XRD, HPPS and FTIR. Under low evaporate velocity, as-synthesized Fe3O4 nanoparticles formed orderly layers structure by self-assembly. Found the concentration of the nanoparticles playing as the key factor for the self-assembly process. With the increase of the concentration, the arrangement of the nanoparticles changed from disordered to ordered monolayer, then to ordered multilayer.