Self-Assembly and Enhanced Magnetic Properties of Three-Dimensional Superlattice Structures Composed of Cube-Shaped EuS Nanocrystals

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• 作者：Atsushi Tanaka ; Hironari Kamikubo ; Yoshihiro Doi ; Yukio Hinatsu ; Mikio Kataoka ; Tsuyoshi Kawai ; Yasuchika Hasegawa
• 刊名：Chemistry of Materials
• 出版年：2010
• 出版时间：March 9, 2010
• 年：2010
• 卷：22
• 期：5
• 页码：1776-1781
• 全文大小：829K
• 年卷期：v.22,no.5(March 9, 2010)
• ISSN：1520-5002

文摘

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.