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Melting Behavior of Copper Nanocrystals Encapsulated in Onion-like Carbon Cages

Published online by Cambridge University Press:  01 July 2005

Andreas K. Schaper ,
Fritz Phillipp  and
Haoqing Hou
Andreas K. Schaper*
Affiliation:
Material Sciences Center, Philipps University, 35032 Marburg, Germany
Fritz Phillipp
Affiliation:
Max Planck Institute for Metals Research, 70569 Stuttgart, Germany
Haoqing Hou
Affiliation:
Chemistry College of Jiangxi Normal University, Nanchang, JX 330027, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Nanoparticulate materials are promising objects for studying the processes that triggermelting of solids. On a pyrolytic route, we successfully encapsulated 20–60 nm diameter Cu nanocrystals within multilayer graphitic carbon spheres. In situ electron microscope observations of the melting and displacement of the encapsulated Cu nanocrystals at temperatures up to 1175 K have provided clear evidence of the process of surface melting and its dependence on the quality of the metal/carbon interface. Detection of crystal defects inside the Cu particles during melting and vaporization has proved that the metal phase maintains its solid crystalline state in the particle center. Indications of the influence of surface anisotropy on the melting behavior were obtained. The carbon cages as a whole remained unchanged during the observations.

Keywords

CatalyticDiffusionFullerene
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 7 , July 2005 , pp. 1844 - 1850
Copyright
Copyright © Materials Research Society 2005

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