Jump to main content
Jump to site search

Issue 5, 2014
Previous Article Next Article

Control of the anisotropic shape of cobalt nanorods in the liquid phase: from experiment to theory… and back

Author affiliations

Abstract

The polyol process is one of the few methods allowing the preparation of metal nanoparticles in solution. Hexagonal close packed monocrystalline Co nanorods are easily obtained in basic 1,2-butanediol at 448 K after a few minutes using a Co(II) dicarboxylate precursor. By using a combined experimental and theoretical approach, this study aims at a better understanding of the growth of anisotropic cobalt ferromagnetic nanoparticles by the polyol process. The growth of Co nanorods along the c axis of the hexagonal system was clearly evidenced by transmission electron microscopy, while the mean diameter was found to be almost constant at about 15 nm. Powder X-ray diffraction data showed that metallic cobalt was generated at the expense of a non-reduced solid lamellar intermediate phase which can be considered as a carboxylate ligand reservoir. Density functional theory calculations combined with a thermodynamic approach unambiguously showed that the main parameter governing the shape of the objects is the chemical potential of the carboxylate ligand: the crystal habit was deeply modified from rods to platelets when increasing the concentration of the ligand, i.e. its chemical potential. The approach presented in this study could be extended to a large number of particle types and growth conditions, where ligands play a key role in determining the particle shape.

Graphical abstract: Control of the anisotropic shape of cobalt nanorods in the liquid phase: from experiment to theory… and back

Back to tab navigation

Supplementary files

Article information


Submitted
17 Jul 2013
Accepted
07 Dec 2013
First published
12 Dec 2013

Nanoscale, 2014,6, 2682-2692
Article type
Paper

Control of the anisotropic shape of cobalt nanorods in the liquid phase: from experiment to theory… and back

K. A. Atmane, C. Michel, J. Piquemal, P. Sautet, P. Beaunier, M. Giraud, M. Sicard, S. Nowak, R. Losno and G. Viau, Nanoscale, 2014, 6, 2682
DOI: 10.1039/C3NR03686C

Social activity

Search articles by author

Spotlight

Advertisements