Monodisperse FePt nanoparticles and ferromagnetic FePt nanocrystal superlattices
Monodisperse FePt nanoparticles and ferromagnetic FePt nanocrystal superlattices
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DOI：
10.1126/science.287.5460.1989
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发表时间：
2000-03-17
期刊：
影响因子：
56.9
通讯作者：
Moser, A
中科院分区：
文献类型：
--
作者：
Sun, SH;Murray, CB;Moser, A
报道了在油酸和油胺稳定剂存在下，通过还原乙酰丙酮铂和分解五羰基铁合成单分散铁铂纳米粒子。FePt颗粒组成易于控制，尺寸在3- 10纳米直径范围内可调，标准偏差小于5%。这些纳米粒子自组装成三维超晶格。热退火将内部颗粒结构从无序的面心立方相转变为有序的面心四方相，并将纳米粒子超晶格转变为铁磁性纳米晶体组件。这些组件在化学上和机械上都很坚固，可以支持高密度的磁化反转转变。
Synthesis of monodisperse iron-platinum (FePt) nanoparticles by reduction of platinum acetylacetonate and decomposition of iron pentacarbonyl in the presence of oleic acid and oleyl amine stabilizers is reported. The FePt particle composition is readily controlled, and the size is tunable from 3- to 10-nanometer diameter with a standard deviation of Less than 5%. These nanoparticles self-assemble into three-dimensional superlattices. Thermal annealing converts the internal particle structure from a chemically disordered face-centered cubic phase to the chemically ordered face-centered tetragonal phase and transforms the nanoparticle superlattices into ferromagnetic nanocrystal assemblies. These assemblies are chemically and mechanically robust and can support high-density magnetization reversal transitions.