Journal
CHEMICAL PHYSICS LETTERS
Volume 349, Issue 5-6, Pages 383-388Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0009-2614(01)01208-8
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Single-walled carbon nanotubes (SWNTs) were grown from the condensed phase by thermally post-annealing of a soot-like material, possibly containing precursors for SWNT growth. The soot-like material was obtained by laser ablation of Ni-Co-graphite composite targets at 550-700 degreesC. This initial material did not contain any SWNTs but postannealing treatment inside an electric furnace at 1200 degreesC under argon flow resulted in SWNTs. The soot-like material prepared at lower temperatures (room temperature to 400 degreesC did not yield SWNTs even after post-annealing. These results indicate that the precursors for the growth of SWNTs can form only above a certain threshold temperature, about 550 degreesC. Once these precursors are present, SWNTs can grow by annealing of the metal-carbon mixture. A growth model is proposed based on these results. (C) 2001 Elsevier Science BN. All rights reserved.
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