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Chemical synthesis and characterization of MnO2-coated Co nanoparticles

Published online by Cambridge University Press:  31 January 2011

Jing An ,
Jun He ,
Dongliang Zhao  and
Zhongyuan Liu
Dongliang Zhao
Affiliation:
Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China
Zhongyuan Liu
Affiliation:
State Key Lab of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
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Abstract

Co/MnO2 particles are synthesized by a simple two-step chemical process. It includes the reduction of Co2+ cations to Co nanoparticles with sodium borohydride (NaBH4) in aqueous solution, followed by coating the sample with a surface layer of MnO2. The coating is accomplished using a simple decomposition reaction, in aqueous KMnO4 solution with acid environment at room temperature. Transmission electron microscopy (TEM) analysis demonstrates that the core of the particles is composed of Co clusters that have a narrow size distribution. The strong interface effect of the Co/MnO2 particles is also studied by the detection of exchange bias phenomena of hysteresis curves.

Keywords

NanostructureChemical SynthesisMagnetic Properties
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 9 , September 2010 , pp. 1748 - 1754
Copyright
Copyright © Materials Research Society 2010

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