Effects of N2 and glow discharge on growth behaviours of carbon nanotubes prepared by the hot filament chemical vapour deposition method
Wang Bi-Ben (王必本)abc, Gu Chang-Zhi (顾长志)a, Dou Yan (窦艳)a, Wang Guo-Ju (王国菊)c, Li Hai-Jun (李海均)ac, Zhu Man-Kang (朱满康)c
a State Key Laboratory of Surface Physics, Institute of Physics, Chinese Academe of Sciences, Beijing 100080, China; b College of Applied Mathematics and Physics, Beijing University of Technology, Beijing 100022, China; c Quantum Materials Laboratory, Beijing University of Technology, Beijing 100022, China
Abstract Carbon nanotubes (CNTs) are prepared by the hot filament chemical vapour deposition method using CH$_4$ and H$_2$ as reaction gases, and the growth behaviours are investigated by scanning electron microscopy and transmission electron microscopy. The results indicate that the CNTs prepared in the absence of N$_2$ or glow discharge are bent; however, they are in an aligned state after introducing N$_2$ into the chamber or forming glow discharge under a negative biased voltage. The results also indicate that the CNTs are of a bamboo-like structure when N$_2$ is intruded as a reaction gas and the alignment degree of the CNTs grown under glow discharge is higher than that grown in N$_2$. This illustrates that the nitric environment and glow discharge play important roles in the growth of CNTs. Combining with the theory related to alloy thermodynamics and collisions, we have analysed the growth mechanism of the CNTs in nitric environment and glow discharge.
Received: 09 May 2003
Revised: 23 June 2003
Accepted manuscript online:
(Scanning electron microscopy (SEM) (including EBIC))
Fund: Project supported by the National Natural Science Foundation of China (Grant No 60021403) and by the State Key Development Program for Basic Research of China (Grant 2002CB613500).
Cite this article:
Wang Bi-Ben (王必本), Gu Chang-Zhi (顾长志), Dou Yan (窦艳), Wang Guo-Ju (王国菊), Li Hai-Jun (李海均), Zhu Man-Kang (朱满康) Effects of N2 and glow discharge on growth behaviours of carbon nanotubes prepared by the hot filament chemical vapour deposition method 2003 Chinese Physics 12 1459
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