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Synthesis of vapor-grown carbon fibers from camphor without catalyst and their characterization

Published online by Cambridge University Press:  31 January 2011

Debabrata Pradhan
Affiliation:
Department of Chemistry, Indian Institute of Technology, Bombay, Mumbai 400 076, India
Maheshwar Sharon
Affiliation:
Department of Chemistry, Indian Institute of Technology, Bombay, Mumbai 400 076, India
Indrajit Mukhopadhyay
Affiliation:
Department of Material Chemistry, Shinshu University, Ueda-386, Japan
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Abstract

Vapor-grown carbon fibers and carbon micro-beads were produced in the absence of catalysts from a natural precursor, camphor, by a thermal chemical vapor deposition process, at different temperatures in an argon medium. Scanning and transmission electron microscopy, Raman spectra, and electrical conductivity studies were used to characterize these fibers. It was observed that cylindrical fibers (diameter ∼3 μm) were obtained at 1033 K and rippled fibers (diameter ∼5 μm) were formed at 1273 K while carbon beads (diameter ∼0.5–1 μm) were formed at 1173 K. It is proposed that agglomeration of carbon beads predominate at pyrolysis temperature greater than 1173 K, resulting into rippled type fibers.

Type
Articles
Copyright
Copyright © Materials Research Society 2003

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