CoPt和CoPt3合金纳米颗粒的湿化学合成及其性质

Wet-chemical synthesis and properties of CoPt and CoPt3 alloy nanoparticles.

作者信息

Frommen Christoph, Rösner Harald, Fenske Dieter

机构信息

Forschungszentrum Karlsruhe GmbH, Institut für Nanotechnologie, Postfach 3640, D-76021 Karlsruhe, Germany.

出版信息

J Nanosci Nanotechnol. 2002 Oct;2(5):509-15. doi: 10.1166/153348802760394098.

DOI:10.1166/153348802760394098

PMID:12908289

Abstract

Surface-protected, air-stable nanoparticles of CoPt and CoPt3 were prepared by thermal decomposition/reduction of organometallic precursors with a long-chain aliphatic diol, also known as the polyol process. Particles 3 nm in diameter showed ferromagnetic behavior up to 350 K (Hc = 65 Oe at T = 300 K; Hc = 410 Oe at T = 5K) and underwent a disordering-ordering phase transformation after annealing that resulted in an increase in coercivity (Hc = 170 Oe at T = 300 K; Hc = 2000 Oe at T = 5 K).

摘要

通过用长链脂肪族二醇对有机金属前驱体进行热分解/还原（即多元醇法）制备了表面有保护、空气稳定的CoPt和CoPt3纳米颗粒。直径为3 nm的颗粒在高达350 K时表现出铁磁行为（T = 300 K时Hc = 65 Oe；T = 5K时Hc = 410 Oe），退火后经历无序-有序相变，导致矫顽力增加（T = 300 K时Hc = 170 Oe；T = 5 K时Hc = 2000 Oe）。