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Synthesis of Cobalt Nanoparticles, Nanorods and Nanowires assisted by Oleic Acid and Oleylamine based Mixtures.

Published online by Cambridge University Press:  11 February 2011

F. Dumestre ,
C. Amiens ,
B. Chaudret ,
M. C. Fromen ,
M. J. Casanove ,
P. Renaud  and
P. Zurcher
F. Dumestre
Affiliation:
LCC-CNRS, 205 Route de Narbonne, 31077 Toulouse, France Motorola Inc., Semiconductor Products Sector, Toulouse, France
C. Amiens
Affiliation:
LCC-CNRS, 205 Route de Narbonne, 31077 Toulouse, France
B. Chaudret
Affiliation:
LCC-CNRS, 205 Route de Narbonne, 31077 Toulouse, France
M. C. Fromen
Affiliation:
CEMES-CNRS, 29 Rue Jeanne Marvig, 31055 Toulouse, France
M. J. Casanove
Affiliation:
CEMES-CNRS, 29 Rue Jeanne Marvig, 31055 Toulouse, France
P. Renaud
Affiliation:
Motorola Inc., Semiconductor Products Sector, Toulouse, France
P. Zurcher
Affiliation:
Motorola Inc., Semiconductor Products Sector, Tempe, AZ 85284
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Abstract

In this paper we report on the synthesis in solution of cobalt nanoparticles, nanorods and nanowires achieved through the decomposition of an organometallic precursor Co(η3-C8H13)(η4-C8H12) and stabilized by carboxylic acid / amine based mixtures. Through decomposition of the precursor in the presence of a 1/1 mixture of oleylamine / oleic acid during 3 hours, the formation of 3 nm spherical nanoparticles is observed while hcp-cobalt nanorods are obtained if the reaction is pursued for 48 hours. Increasing the amount of oleic acid to 2 equivalents with respect to the amine results in the formation of hcp-cobalt nanowires, micrometers in length and 6 nm mean diameter‥ By using amines with various chain lengths we have observed a modification of the aspect ratio of the cobalt nanorods1. For example, the decomposition of Co(η3-C8H13)(η4-C8H12) in the presence of octadecyl-, hexadecyl-, dodecyl- and octylamine in association with oleic acid allows to selectively produce nanorods of varying aspect ratio.

Physical characterization using TEM and HRTEM, shows that the nanoparticles, nanorods and nanowires are all hcp single crystals. The magnetic properties reveal a saturation magnetization similar to that of bulk and a ferromagnetic behavior at room temperature for the nanorods and nanowires while the 3 nm nanoparticles remain super-paramagnetic.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 735: Symposium C – Bioinspired Nanoscale Hybrid Systems , 2002 , C10.4
Copyright
Copyright © Materials Research Society 2003

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References

REFERENCES

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