Journal of Materials Research


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

Seung I. Chaa1, Chan B. Moa1, Kyung T. Kima1, Yong J. Jeonga1 and Soon H. Honga1 c1

a1 Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yusung-gu, Daejeon 305-701, Korea


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.

(Received January 25 2006)

(Accepted May 25 2006)

(Online publication March 03 2011)

Key Words:

  • Cu;
  • Nanostructure;
  • Particulate


c1 Address all correspondence to this author. e-mail: