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Synthesis of cobalt oxide nanocrystal self-assembled materials

Published online by Cambridge University Press:  31 January 2011

J. S. Yin  and
Z. L. Wang
J. S. Yin
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245
Z. L. Wang*
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245
*
a)Address all correspondence to this author. e-mail: zhong.wang@mse.gatech.edu
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Abstract

Self-assembling of size, shape, and phase-selected nanocrystals into superlattices in a new approach for synthesizing a new generation of advanced materials with functionality. In this paper, high purity and monodispersive tetrahedral of CoO, with edge lengths of 4.4 ± 0.2 nm, have been synthesized and separated from Co nanocrystals using colloidal chemistry and magnetic separation. The tetrahedral CoO nanocrystals behave like a molecular matter, and their assembling forms superlattices with translational symmetry. The phase transformation of the CoO nanocrystals is examined by ex situ annealing in oxygen, and the results showed the formation of Co3O4 with spinel structure.

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Articles
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Journal of Materials Research , Volume 14 , Issue 2 , February 1999 , pp. 503 - 508
Copyright
Copyright © Materials Research Society 1999

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