Size and shape control of monodisperse FePt nanoparticles
Size and shape control of monodisperse FePt nanoparticles
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DOI：
10.1021/jp068330e
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发表时间：
2007-03-22
影响因子：
3.7
通讯作者：
Liu, J. Ping
中科院分区：
文献类型：
--
作者：
Nandwana, Vikas;Elkins, Kevin E.;Liu, J. Ping
对FePt纳米粒子的形貌控制进行了系统的研究。通过改变合成参数，包括前体、溶剂、表面活性剂的量和溶液的加热速率，可以以1 nm的精度调节2至9 nm的粒度。虽然大多数颗粒的形状是球形的，但当颗粒大于7nm时可以获得立方体颗粒。还获得了棒状纳米颗粒。合成的纳米粒子被发现是超顺磁性在室温下，其阻断温度是大小依赖的，随着粒径的增加。在还原性气氛中退火后，纳米颗粒形成了具有有序fct结构的硬磁薄膜，其矫顽力高达2.7T。
Morphological control of FePt nanoparticles has been systematically studied. By varying synthetic parameters including precursors, solvents, amount of surfactants, and heating rate of the solution, the particle size from 2 to 9 nm can be tuned with 1 nm accuracy. While most particles are spherical in shape, cubic particles can be obtained when particles are greater than 7 nm. Rod-shape nanoparticles have also been obtained. The as-synthesized nanoparticles are found to be superparamagnetic at room temperature and their blocking temperature is size dependent that increases with particle size. After annealing in a reducing atmosphere, the nanoparticles form hard magnetic films with ordered fct structure and high coercivity up to 2.7 T.