Preparation and characterization of Co-Pt bimetallic magnetic nanoparticles

被引：29

作者：

Du, XY ^{[1
]}

Inokuchi, M ^{[1
]}

Toshima, N ^{[1
]}

机构：

[1] Tokyo Univ Sci, Dept Mat Sci & Environm Engn, Onoda, Yamaguchi 7560884, Japan

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2006年 / 299卷 / 01期

基金：

日本学术振兴会;

关键词：

nanoparticles; cobalt; platinum; magnetic properties;

D O I：

10.1016/j.jmmm.2005.03.013

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

COPt3 nanoparticles are synthesized by a two-stage route using NaBH4 as a reductant. The nanoparticles are characterized by thermogravimetry (TG) and differential thermal analysis (DTA), Fourier transform infrared (FT-IR), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Structural and spectroscopic studies show that the nanoparticles adopt a face-centered-cubic (FCC) crystalline structure with an average particle size of 2.6 nm. SQUID studies reveal that as-synthesized nanoparticles are superparamagnetic at room temperature and ferromagnetic at 1.85 K with coercivity of 980 Oe. Annealing of the samples at 500 degrees C causes an increase of particle size and a decrease of coercivity. (C) 2005 Elsevier B.V. All rights reserved.

引用

页码：21 / 28

页数：8

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