CoPt nanoparticles by a modified polyol process

被引：16

作者：

An, Boo Hyun ^{[1
]}

Wu, Jun Hua ^{[1
]}

Liu, Hong Ling ^{[2
]}

Ko, Seung Pil ^{[1
]}

Ju, Jae-Seon ^{[3
]}

Kim, Young Keun ^{[2
]}

机构：

[1] Korea Univ, Res Inst Engn & Technol, Dept Mat Sci & Engn, Seoul 136713, South Korea

[2] Korea Univ, Inst Nano Sci, Seoul 136713, South Korea

[3] Sungkyunkwan Univ, Cooperat Ctr Res Facil, Suwon 440746, South Korea

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2008年 / 313卷 / 250-253期

基金：

新加坡国家研究基金会;

关键词：

nanoparticles; CoPt; magnetic; polyol; surfactant;

D O I：

10.1016/j.colsurfa.2007.04.105

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We synthesized monodisperse CoPt nanoparticles by a modified polyol process, in which Co(acac)(3) and Pt(acac)(2) were co-reduced by a diol in the presence of PVP surfactants at high temperature (acac = acetylacetonate, PVP = polyvinylpyrrolidone). It is found that the CoPt nanoparticles assume a face-centered cubic phase and possess high crystallinity, with a particle size of 5.3 nm and a tight size distribution. The nanoparticles show superparamagnetism in the as-synthesized state and become ferromagnetic after annealing. The magnetization process of the nanoparticles prior to heat treatment was analyzed by the Langevin equation and their effective magnetic particle size was thus obtained, in close approximation to the results from the XRD and TEM observation. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：250 / 253

页数：4

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