Synthesis of FePt nanocubes and their oriented self-assembly
Synthesis of FePt nanocubes and their oriented self-assembly
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DOI：
10.1021/ja061704x
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发表时间：
2006-06-07
影响因子：
15
通讯作者：
Sun, Shouheng
中科院分区：
文献类型：
--
作者：
Chen, Min;Kim, Jaemin;Sun, Shouheng
通过控制Fe(CO)5的分解和Pt(acac)2的还原以及油酸和油胺的添加顺序，在205℃下合成了单分散FePt纳米立方体。与呈现 3D 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了超晶格阵列，每个 FePt 立方体呈现出（100）纹理。热退火将化学无序的 fcc FePt 转化为化学有序的 fct FePt，并且退火后的组件在平行和垂直于基板的方向上都显示出强的 (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体应用的磁对准 FePt 纳米晶体阵列提供了一种有前途的方法。
Monodisperse FePt nanocubes are synthesized at 205 °C by controlling decomposition of Fe(CO)5and reduction of Pt(acac)2and 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.