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

Title
Carbon nanoflake growth from carbon nanotubes by hot filament chemical vapor deposition
Authors
Subasa C. SahooDipti R. Mohapatra이학주Suhas M. Jejurikar김인호이승철박종극백영준이욱성
Issue Date
2014-02
Publisher
Carbon
Citation
VOL 67, 704-711
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–H2–Ar precursor gas mixture with 1% CH4, at the chamber pressure and the substrate temperature of 7.5 Torr and 840 ℃, respectively. In the H2-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.
URI
http://pubs.kist.re.kr/handle/201004/46686
ISSN
00086223
Appears in Collections:
KIST Publication > Article
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