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Issue 3, 2017
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High coercivity stellated cobalt metal multipods through solvothermal reduction of cobalt hydroxide nanosheets

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Abstract

Solvated 2D nanosheets of dodecylsulphate intercalated α-cobalt hydroxide in 1-butanol are solvothermally reduced to hexagonal close packed (hcp) Co metal multipods in the presence of oleylamine. 1-Butanol, being a reducing solvent, facilitates the formation of Co metal. In addition to being a reducing agent, oleylamine also acts as a base which converts the metastable α-cobalt hydroxide nanosheets into β-hydroxide sheets. These sheets yield face centered cubic (fcc) CoO spheres which eventually grow into hcp Co metal multipods. All the pods are single crystalline with growth direction being [001], making the multipods resemble stellated polyhedra with overgrown branches. The stellated Co metal multipods exhibit high coercivity (Hc), of 880 and 552 Oe at 2 K and 300 K respectively, due to shape anisotropy.

Graphical abstract: High coercivity stellated cobalt metal multipods through solvothermal reduction of cobalt hydroxide nanosheets

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Article information


Submitted
16 Oct 2016
Accepted
14 Nov 2016
First published
05 Jan 2017

This article is Open Access

RSC Adv., 2017,7, 1413-1417
Article type
Paper

High coercivity stellated cobalt metal multipods through solvothermal reduction of cobalt hydroxide nanosheets

C. Nethravathi, C. R. Rajamathi, S. Singh, M. Rajamathi and C. Felser, RSC Adv., 2017, 7, 1413
DOI: 10.1039/C6RA25309A

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