Self-Assembly and Enhanced Magnetic Properties of Three-Dimensional Superlattice Structures Composed of Cube-Shaped EuS Nanocrystals
Self-Assembly and Enhanced Magnetic Properties of Three-Dimensional Superlattice Structures Composed of Cube-Shaped EuS Nanocrystals
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DOI：
10.1021/cm9032513
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发表时间：
2010-01
影响因子：
8.6
通讯作者：
A. Tanaka;H. Kamikubo;Y. Doi;Y. Hinatsu;M. Kataoka;T. Kawai;Y. Hasegawa
中科院分区：
文献类型：
--
作者：
A. Tanaka;H. Kamikubo;Y. Doi;Y. Hinatsu;M. Kataoka;T. Kawai;Y. Hasegawa
报道了立方EuS纳米晶组装的超晶格结构及其优异的磁性。以油胺为表面改性剂，四（二乙基二硫代氨基甲酸）铕配合物为单一前驱体，通过热还原法制备了立方体形的EuS纳米粒子。用TEM、小角XRD和电子透射断层分析表征了EuS纳米碳组装的三维（3D）SLS的精细结构。用SQUID对聚合物薄膜上的SLS进行了磁性测量，结果表明，与立方体EuS纳米粒子组装的SLS的矫顽场是立方体EuS纳米粒子组装的SLS的矫顽场的2倍。增强的磁性归因于SLS结构中立方体形状EuS NC之间的磁偶极相互作用。
Superlattice structures (SLSs) assembled with cube-shaped EuS nanocrystals (NCs) and their remarkable magnetic properties are reported. The cube-shaped EuS NCs are prepared by the thermal reduction of single source precursor, tetra(diethyldithiocarbamate) europium complex with oleylamine as a surface modified regent. The fine structures of the three-dimensional (3D) SLSs assembled with EuS NCs are characterized by TEM, small-angle XRD, and electron transmission tomographic analysis. Magnetic measurements of the SLSs on polymer films with SQUID show that the coercive field of the SLSs assembled with cube-shaped EuS NCs are twice larger than those of cube-shaped EuS NCs powder. The enhanced magnetic properties are attributed to magnetic dipole interaction between cube-shaped EuS NCs in SLS structures.