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Mechanism for controlling the shape of Cu nanocrystals prepared by the polyol process

Published online by Cambridge University Press:  03 March 2011

Seung I. Cha ,
Chan B. Mo ,
Kyung T. Kim ,
Yong J. Jeong  and
Soon H. Hong
Seung I. Cha
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yusung-gu, Daejeon 305-701, Korea
Chan B. Mo
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yusung-gu, Daejeon 305-701, Korea
Kyung T. Kim
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yusung-gu, Daejeon 305-701, Korea
Yong J. Jeong
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yusung-gu, Daejeon 305-701, Korea
Soon H. Hong*
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yusung-gu, Daejeon 305-701, Korea
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

This study investigated a mechanism for controlling the shape of Cu nanocrystals fabricated using the polyol process, which considers the thermodynamic transition from a faceted surface to a rough surface and the growth mechanisms of nanocrystals with faceted or rough surfaces. The faceted surfaces were stable at relatively low temperatures because of the low entropy of perfectly faceted surfaces. Nanocrystals fabricated using a coordinative surfactant stabilized the faceted surface at a higher temperature than those fabricated using a noncoordinative surfactant. The growth rate of the surface under a given driving force was dependent on the surface structure, i.e., faceted or rough, and the growth of a faceted surface was a thermally activated process. Surface twins decreased the activation energy for growth of the faceted surface and resulted in rod- or wire-shaped nanocrystals.

Keywords

CuNanostructureParticulate
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 9 , September 2006 , pp. 2371 - 2378
Copyright
Copyright © Materials Research Society 2006

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References

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