Carbon nanoflake growth from carbon nanotubes by hot filament chemical vapor deposition

Sahoo, Subasa C and Mohapatra, Dipti R and Lee, Hak-Joo and Jejurikar, Suhas M and Kim, Inho and Lee, Seung-Cheol and Park, Jong-Keuk and Baik, Young-Loon and Lee, Wook-Seong (2014) Carbon nanoflake growth from carbon nanotubes by hot filament chemical vapor deposition. In: CARBON, 67 . pp. 704-711.

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Abstract

We report the growth of carbon nanoflakes (CNFs) on Si substrate by the hot filament chemical vapor deposition without the substrate bias or the catalyst. CNFs were grown using the single wall carbon nanotubes and the multiwall carbon nanotubes as the nucleation center, in the Ar-rich CH4-H-2-Ar precursor gas mixture with 1% CH4, at the chamber pressure and the substrate temperature of 7.5 Ton and 840 degrees C, respectively. In the H-2-rich condition, CNF synthesis failed due to severe etch-removal of carbon nanotubes (CNTs) while it was successful at the optimized Ar-rich condition. Other forms of carbon such as nano-diamond or mesoporous carbon failed to serve as the nucleation centers for the CNF growth. We proposed a mechanism of the CNF synthesis from the CNTs, which involved the initial unzipping of CNTs by atomic hydrogen and subsequent nucleation and growth of CNFs from the unzipped portion of the graphene layers. (C) 2013 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	CARBON
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copyright for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, ENGLAND
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	10 Feb 2014 10:16
Last Modified:	10 Feb 2014 10:16
URI:	http://eprints.iisc.ac.in/id/eprint/48329

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