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Author(s): |
Jian-guo Zhao, Institute of Carbon Materials Science, Shanxi Datong University, Datong, 037009, China
Quan-gui Guo, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
Xiang-yun Guo, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
Ling Gu, Institute of Carbon Materials Science, Shanxi Datong University, Datong, 037009, China
Jiang Li, Institute of Carbon Materials Science, Shanxi Datong University, Datong, 037009, China
Wen-shan Qv, Institute of Carbon Materials Science, Shanxi Datong University, Datong, 037009, China
Yong Guo, Institute of Carbon Materials Science, Shanxi Datong University, Datong, 037009, China |
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Abstract: |
Helical carbon nanotubes were synthesized by a catalytic chemical vapor deposition using acetylene as a carbon source and a mixture of tin powder and cobalt nitrate as catalyst. The tin powder has great influence on the appearance, diameter and pitch of the helical carbon nanotubes. By adjusting the process parameters, It is easier to get helical carbon nanotubes with 80% purity, a diameter between 80 nm and 100 nm, and a pitch of 100 nm to 120 nm. The result shows that tin plays an important role in the formation of helix- shaped carbon nanotubes. Since the presence of liquid tin, the growth of carbon nanotubes isotropic environment has changed, so helix-shaped carbon nanotubes were synthesized.
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