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Nucleation, Cluster Growth, and Structure of Crystalline C60 and C70

Published online by Cambridge University Press:  25 February 2011

Nan Yao
Affiliation:
Exxon Research and Engineering Company, Annandale, New Jersey 08801-0998, USA
S. K. Behal
Affiliation:
Exxon Research and Engineering Company, Annandale, New Jersey 08801-0998, USA
C. F. Klein
Affiliation:
Exxon Research and Engineering Company, Annandale, New Jersey 08801-0998, USA
M. M. Disko
Affiliation:
Exxon Research and Engineering Company, Annandale, New Jersey 08801-0998, USA
S. C. Fung
Affiliation:
Exxon Research and Engineering Company, Annandale, New Jersey 08801-0998, USA
R. D. Sherwood
Affiliation:
Exxon Research and Engineering Company, Annandale, New Jersey 08801-0998, USA
K. M. Creegan
Affiliation:
Exxon Research and Engineering Company, Annandale, New Jersey 08801-0998, USA
D. M. Cox
Affiliation:
Exxon Research and Engineering Company, Annandale, New Jersey 08801-0998, USA
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Abstract

The nucleation and cluster growth of C60 and C70 crystallites on various substrates at ambient temperature have been investigated using electron microscopy. It was found that the initial nucleation is closely associated with surface defects, and the fullerenes are much more strongly bonded to each other than to the substrate. Sublimed C60 or C70 crystallites nucleate at the step edge in the liquid state and are aligned with the step walls and terraces through the process of coalescence. Reflection Electron Microscopy (REM) studies have shown an abnormal profile of C60 grown crystals as a result of the interaction of C60 molecules with the surface strain field during crystal growth. Transmission electron diffraction patterns reveal a twin structure with (110) habit plane for the low temperature ordered phase.

Type
Research Article
Copyright
Copyright © Materials Research Society 1992

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References

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