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Nucleation and growth of carbon nanotubes in a mechano-thermal process

journal contribution
posted on 01.01.2004, 00:00 authored by Ying (Ian) ChenYing (Ian) Chen, M Conway, J Fitzgerald, J Williams, L Chadderton
Separate nucleation and growth processes of carbon nanotubes were found in a mechano-thermal method in which carbon nanotubes are produced by first mechanical milling of graphite powder at room temperature and subsequent thermal annealing up to 1400 °C. The ball-milled graphite contains nucleation structures (nanosized metal particles and deformed (0 0 2) layers containing pentagons), and disordered carbon as a free carbon atom source. The subsequent annealing activates the growth of two types of multi-walled nanotubes in the absence of carbon vapor. Thin nanotubes (diameter <20 nm) are formed via crystallization of the disordered carbon with the preferred formation of the (0 0 2) basal planes. Thick nanotubes (diameter >20 nm) are formed through a metal catalytic solution–precipitation process (solid–liquid–solid). In both cases, carbon nanotubes grew out from disordered carbon particles with closed tips.

History

Journal

Carbon

Volume

42

Issue

8-9

Pagination

1543 - 1548

Publisher

Elsevier Ltd

Location

New York, N.Y.

ISSN

0008-6223

eISSN

1873-3891

Language

eng

Notes

Available online 16 March 2004

Publication classification

C1.1 Refereed article in a scholarly journal; C Journal article

Copyright notice

2004, Elsevier Ltd