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Wüstite nanocrystals: Synthesis, structure and superlattice formation

Published online by Cambridge University Press:  31 January 2011

Ming Yin ,
Zhuoying Chen ,
Brian Deegan  and
Stephen O’Brien
Ming Yin*
Affiliation:
Materials Research Science and Engineering Center, Columbia University, Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027
Zhuoying Chen
Affiliation:
Materials Research Science and Engineering Center, Columbia University, Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027
Brian Deegan
Affiliation:
Materials Research Science and Engineering Center, Columbia University, Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027
Stephen O’Brien*
Affiliation:
Materials Research Science and Engineering Center, Columbia University, Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027
*
a)Current address: Los Alamos National Laboratory, Los Alamos, NM 87545
b)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Monodisperse ligand-capped cubic wüstite FexO nanocrystals were prepared by a novel thermal decomposition method of iron (II) acetate in the presence of oleic acid as the surfactant. Controlled size distributions of cubic nanoparticles possessing the rock salt crystal structure were isolated in the range 10–18 nm. The influence of molar ratio of surfactant to precursor was investigated to understand size control and monodispersity. Using inexpensive, nontoxic metal salts as reactants, we were able to synthesize gram-scale quantities of relatively monodisperse nanocrystals in a single reaction, without further size selection, characterized by x-ray diffraction and transmission electron microscopy. The procedure enables the collection of samples of uniform size as a function of time, thus permitting a preliminary solid-state kinetic analysis of the reaction as a function of increasing particle size. Following controlled evaporation from nonpolar solvents, self-assembly into two-dimensional arrays, three-dimensional single-component superlattices, and binary superlattices with gold nanoparticles were observed and characterized.

Keywords

NanoscaleNanostructureOxide
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 7 , July 2007 , pp. 1987 - 1995
Copyright
Copyright © Materials Research Society 2007

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References

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