Highly ordered self-assembly with large area of Fe3O4 nanoparticles and the magnetic properties.
Highly ordered self-assembly with large area of Fe3O4 nanoparticles and the magnetic properties.
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DOI：
10.1021/jp054291f
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发表时间：
2005-11
期刊：
影响因子：
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通讯作者：
Tianzhong Yang;Chengmin Shen;Zi-An Li;Huairuo Zhang;Congwen Xiao;Shutang Chen;Zhichuan J. Xu;
中科院分区：
文献类型：
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作者：
Tianzhong Yang;Chengmin Shen;Zi-An Li;Huairuo Zhang;Congwen Xiao;Shutang Chen;Zhichuan J. Xu;
采用高温液相法合成了尺寸分布窄的单分散Fe3O4纳米颗粒。通过改变反应条件，合成的纳米粒子直径可在2 ~ 14 nm范围内调节。成功地获得了面积超过0.8 μ m × 0.7 μ m的Fe3O4 NPs的高度有序超晶格结构。研究了它们在不同状态下的磁性能，如在固体状态下和在不同浓度的蜡中稀释时。随着粒子间距的增大，材料的剩余磁化强度和低温矫顽力等磁性能得到增强。此外，我们还观察到饱和磁化强度随温度的变化与预期的一致。对上述性质提出了初步的解释。
Monodisperse Fe3O4 nanoparticles (NPs) with narrow size distribution are synthesized by a high-temperature solution-phase method. The diameter of the as-synthesized NPs is tuned from 2 to 14 nm by varying the reaction conditions. Highly ordered superlattice structures of the Fe3O4 NPs with areas extending over 0.8 microm x 0.7 microm have been successfully obtained. The magnetic properties are investigated in their different states, such as in the solid state and diluted in wax with different concentrations. Some magnetic properties enhanced by increasing interparticle distances, such as the remanent magnetization and coercive field at low temperature, were noticed. Furthermore, we also observed that the saturation magnetization changed with temperature as expected. The preliminary explanation for the properties mentioned above is proposed.