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Influence of Capping Groups on the Synthesis of γ-Fe2O3 Nanocrystals

Published online by Cambridge University Press:  03 March 2011

Ming Yin ,
Amanda Willis ,
Franz Redl ,
Nicholas J. Turro  and
Stephen P. O’Brien
Ming Yin
Affiliation:
Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027
Amanda Willis
Affiliation:
Department of Chemistry, Columbia University, New York, New York 10027
Franz Redl
Affiliation:
Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027
Nicholas J. Turro
Affiliation:
Department of Chemistry, Columbia University, New York, New York 10027
Stephen P. O’Brien*
Affiliation:
Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027
*
a)Address all correspondence to this author. e-mail: so188@columbia.edu
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Abstract

Monodisperse and uniform γ-Fe2O3 (maghemite) nanocrystals of variable size were prepared by thermal decomposition of iron pentacarbonyl [Fe(CO)5] in the presence of surfactants, following controlled oxidation with trimethylamine N-oxide as a mild oxidant. The influence of carboxylic acids with variable alkyl carbon chain lengths on the synthesis of γ-Fe2O3 nanocrystals was investigated. The effect of the molar ratios of surfactant to iron precursor was also studied. The nanocrystals were characterized by x-ray diffraction (XRD) and transmission electron microscopy (TEM). XRD showed the particles were highly crystalline at the nanometer scale. The results showed that the size and shape of the nanocrystal is strongly influenced by the decomposition temperature of iron pentacarbonyl and closely related to the length of carbon chain of the capping groups and the molar ratio of surfactant to iron precursor. Following controlled evaporation from nonpolar solvents, self-assembly into two-dimensional arrays could be observed by TEM. It was also found that the distance between the nanocrystals in self-assembled structures matched the length of the capping molecules very well.

Keywords

Iron oxideNanoparticleNanocrystal
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 4 , April 2004 , pp. 1208 - 1215
Copyright
Copyright © Materials Research Society 2004

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References

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