期刊
ACS NANO
卷 4, 期 9, 页码 5087-5094出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn100944n
关键词
carbon nanotubes; nanotube orientation; plasma enhanced chemical vapor deposition
类别
资金
- National Science Foundation (NSF) [CBET-0613629]
- NSF-NNIN
We examined the structure, morphology, and orientation of catalyst nanoparticles used for seeding and growing multiwall carbon nanotubes (MWCNTs) by plasma enhanced chemical vapor deposition in CH4/H-2 gas mixtures. Iron catalyst nanocrystals are converted to Fe3C in CH4/H-2 plasmas and the MWCNTs grow from Fe3C nanocrystals. Initially faceted and equiaxed catalyst nanooystals are distorted and elongated significantly once a tubular (NT structure is formed around the catalyst particles. Eventually, catalysts deform into elongated tear-drop shapes. Once this morphology forms, (NT structures produced are straight and have uniform diameters. Surprisingly, the Fe3C nanocrystals located inside the base of well-graphitized nanotubes do not exhibit a preferred orientation relative to the nanotube axis. Catalyst nanocrystals in a variety of orientations relative to the nanotube axis still produce well-graphitized nanotubes with similar diameters and structures.
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