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Ferromagnetic Cobalt Nanodots, Nanorices, Nanowires and Nanoflowers by Polyol Process

Published online by Cambridge University Press:  01 August 2005

Seung I. Cha ,
Chan B. Mo ,
Kyung T. Kim  and
Soon H. Hong
Seung I. Cha
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yusung-gu, Daejon 305-701, Korea
Chan B. Mo
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yusung-gu, Daejon 305-701, Korea
Kyung T. Kim
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yusung-gu, Daejon 305-701, Korea
Soon H. Hong*
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yusung-gu, Daejon 305-701, Korea
*
a) Address all correspondence to this author. e-mail: shhong@kaist.ac.kr
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Abstract

Various shapes and sizes of colloidal Co nanoparticles were fabricated by the polyol process using Co(acac)3, 1,2-hexadecanediol, oleylamine, and oleic acid within octylether. The rice-shaped Co nanoparticles with size of 30 nm and aspect ratio of 1.8 can be fabricated into a self-assembled form without assistance of surfactants. The addition of oleylamine as surfactant decreased the particle size and aspect ratio, and the addition of oleic acid made the surface of particle faceted without decreasing particle size from that of rice shape. The mixture of oleylamine and oleic acid produce differently shaped Co nanoparticles, including nanoprism, nanowire, and nanoflower according to the ratio of components, total amount of surfactant mixture, and reaction time. The fabricated nanoparticles showed ferromagnetic properties. These results showed that the various size and shape of metallic nanoparticles can be fabricated by the polyol process into controlled forms.

Keywords

Chemical synthesisMagnetic propertiesNanoparticle
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 8 , August 2005 , pp. 2148 - 2153
Copyright
Copyright © Materials Research Society 2005

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