Chen Min, Kim Jaemin, Liu J P, Fan Hongyou, Sun Shouheng
IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, USA.
J Am Chem Soc. 2006 Jun 7;128(22):7132-3. doi: 10.1021/ja061704x.
Monodisperse FePt nanocubes are synthesized at 205 degrees C by controlling decomposition of Fe(CO)5 and reduction of Pt(acac)2 and addition sequence of oleic acid and oleylamine. Different from the assembly of the sphere-like FePt nanoparticles, which shows 3D random structure orientation, self-assembly of the FePt nanocubes leads to a superlattice array with each FePt cube exhibiting (100) texture. Thermal annealing converts the chemically disordered fcc FePt to chemically ordered fct FePt, and the annealed assembly shows a strong (001) texture in the directions both parallel and perpendicular to the substrate. This shape-controlled synthesis and self-assembly offers a promising approach to fabrication of magnetically aligned FePt nanocrystal arrays for high density information storage and high performance permanent magnet applications.
通过控制五羰基铁（Fe(CO)₅）的分解、乙酰丙酮铂（Pt(acac)₂）的还原以及油酸和油胺的添加顺序，在205摄氏度下合成了单分散的FePt纳米立方体。与呈现三维随机结构取向的球状FePt纳米颗粒的组装不同，FePt纳米立方体的自组装导致形成超晶格阵列，其中每个FePt立方体呈现出（100）织构。热退火将化学无序的面心立方（fcc）FePt转变为化学有序的体心四方（fct）FePt，并且退火后的组装体在平行和垂直于基板的方向上均呈现出强烈的（001）织构。这种形状控制的合成和自组装为制造用于高密度信息存储和高性能永磁应用的磁取向FePt纳米晶体阵列提供了一种有前景的方法。
