Synthesis, characterization and self‐assemblies of magnetite nanoparticles
Synthesis, characterization and self‐assemblies of magnetite nanoparticles
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DOI：
10.1002/sia.2329
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发表时间：
2006-06
影响因子：
1.7
通讯作者：
Tianzhong Yang;Chengmin Shen;Haitao Yang;Congwen Xiao;Zhichuan J. Xu;Shutang Chen;D. Shi;Hong-Jun Gao
中科院分区：
文献类型：
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作者：
Tianzhong Yang;Chengmin Shen;Haitao Yang;Congwen Xiao;Zhichuan J. Xu;Shutang Chen;D. Shi;Hong-Jun Gao
采用高温固相法制备了尺寸分布窄的单分散纳米Fe3O4颗粒。通过改变反应条件，将磁性纳米粒子的直径调节到2~13 nm，得到了纳米磁性粒子的单层和多层自组装。介绍了超晶格的几种组装形式，并讨论了驱动粒子形成超晶格的原因。物理性质测试系统(PPMS)结果表明，合成的纳米粒子在低温(5K)下是亚铁磁性的，而在室温(300K)下是超顺磁性的。此外，通过交换反应将颗粒转化为亲水性颗粒。版权所有©2006 John Wiley&Sons，Ltd.
Monodisperse Fe3O4 nanoparticles (NPs) with a narrow size distribution were synthesized by a high‐temperature solution‐phase method. The diameter of magnetic NPs was tuned from 2 to 13 nm by varying the reaction conditions, and the monolayer and multilayer self‐assemblies of the NPs were obtained. A few kinds of the assemblies are presented and the reasons that drive the particles to form the superlattices are discussed. The physical‐property‐measurement system (PPMS) results showed that the as‐synthesized NPs are ferrimagnetic at low temperatures (5 K) while they are superparamagnetic at room temperature (300 K). In addition, the particles were transformed into hydrophilic ones by an exchange reaction. Copyright © 2006 John Wiley & Sons, Ltd.