Shape-Controlled Synthesis and Magnetic Properties of Monodisperse Fe3O4 Nanocubes
Shape-Controlled Synthesis and Magnetic Properties of Monodisperse Fe3O4 Nanocubes
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DOI：
10.1021/cg900920q
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发表时间：
2010-07-01
影响因子：
3.8
通讯作者：
Qiu, Guanzhou
中科院分区：
文献类型：
--
作者：
Gao, Guanhua;Liu, Xiaohe;Qiu, Guanzhou
在油酸和油胺存在下，通过简单的溶剂热法在 260 摄氏度下成功合成了单分散 Fe3O4 纳米立方体。无需尺寸选择过程即可获得平均尺寸为 12 nm 的均匀 Fe3O4 纳米立方体的明确组装。通过调整反应参数，所制备的 Fe3O4 纳米粒子的形状可以在球体和立方体之间可逆地互换。通过 X 射线衍射 (X R D)、透射电子显微镜 (TEM) 和高分辨率透射电子显微镜 (HRTEM) 详细研究了所制备产物的相结构、形貌和尺寸。使用量子设计超导量子干涉装置（SQUID）测量了 Fe3O4 纳米立方体的磁性能。磁性研究表明，合成的纳米立方体在 2 K 下具有铁磁性，而在 300 K 下具有超顺磁性。
Monodisperse Fe3O4 nanocubes have been successfully synthesized by a facile solvothermal method at 260 degrees C in the presence of oleic acid and oleylamine. Well-defined assembly of uniform Fe3O4 nanocubes with an average size of 12 nm could be obtained without a size-selection process. The shape of as-prepared Fe3O4 nanoparticles could be reversibly interchanged between spheres and cubes by adjusting the reaction parameters. The phase structures, morphologies, and sizes of as-prepared products were investigated in detail by X-ray diffraction (X R D), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). The magnetic properties of Fe3O4 nanocubcs were measured by using a quantum design superconducting quantum interference device (SQUID). The magnetic study reveals that the assynthesized nanocubcs are ferromagnetic at 2 K while they are superparamagnetic at 300 K.