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

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Rajamathi,  Catherine R.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Singh,  Sanjay
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser,  Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Nethravathi, C., Rajamathi, C. R., Singh, S., Rajamathi, M., & Felser, C. (2017). High coercivity stellated cobalt metal multipods through solvothermal reduction of cobalt hydroxide nanosheets. RSC Advances, 7, 1413-1417. doi:10.1039/C6RA25309A.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002C-8E6E-2
Abstract
Solvated 2D nanosheets of dodecylsulphate intercalated [small alpha]-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 [small alpha]-cobalt hydroxide nanosheets into [small beta]-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.