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Formation of graphite encapsulated ferromagnetic particles and a mechanism for their growth

Published online by Cambridge University Press:  31 January 2011

A. A. Setlur ,
J. Y. Dai ,
J. M. Lauerhaas ,
P. L. Washington  and
R. P. H. Chang
A. A. Setlur
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
J. Y. Dai
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
J. M. Lauerhaas
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
P. L. Washington
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
R. P. H. Chang
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
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Abstract

Graphite encapsulated nanoparticles have numerous possible applications due to their novel properties and their ability to survive rugged environments. Evaporation of Fe, Ni, or Co with graphite in a hydrogen atmosphere results in graphite encapsulated nanoparticles found on the chamber walls. Similar experiments in helium lead to nanoparticles embedded in an amorphous carbon/fullerene matrix. Comparing the experimental results in helium and hydrogen, we propose a mechanism for the formation of encapsulated nanoparticles. The hydrogen arc produces polycyclic aromatic hydrocarbon (PAH) molecules, which can act as a precursor to the graphitic layers around the nanoparticles. Direct evidence for this mechanism is given by using pyrene (C16H10), a PAH molecule, as the only carbon source to form encapsulated nanoparticles.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 8 , August 1998 , pp. 2139 - 2143
Copyright
Copyright © Materials Research Society 1998

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