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Citation: Wang Sheng-Gao, Wang Jian-Hua, Wang Chuan-Xin, Ma Zhi-Bin, Man Wei-Dong. Self-bias Induced Aligned Growth of Carbon Nanotubes[J]. Acta Physico-Chimica Sinica, ;2003, 19(09): 864-866. doi: 10.3866/PKU.WHXB20030917 shu

Self-bias Induced Aligned Growth of Carbon Nanotubes

1.
Province Key Laboratory of Plasma Chemistry and Advanced Materials, Department of Material Science and Engineering , Wuhan Institute of Chemical Technology, Wuhan　430073; Institute of Plasma Physics, Chinese Academy of Sciences, Hefei　230031

Received Date: 10 January 2003
Available Online: 15 September 2003

In this paper, under the catalytic effect of nickel particles supported on glass, self-aligned carbon nanotubes were synthesized by microwave plasma chemical vapor deposition under a mixture of methane and hydrogen gases at about 550 ℃.During the process of nanotubes growth, the total pressure in the chamber was kept at 3 kPa, the microwave plasma input power was 300 W, and the flow rates of H2 and CH4 were 50 and 1 standard cubic centimeter (sccm) per minute, respectively. It was found that the carbon nanotubes grew always perpendicular to the substrate surface under the effect of plasma. When the substrate was not contacted with plasma, only entangled carbon nanotubes grew on glass randomly. From the research results, we can demonstrate that the electrical self-bias imposed on the substrate is the primary mechanism responsible for the alignment of carbon nanotubes, and we can envision that this simple method can be of great importance for the fabrication of devices in the future.
- Carbon nanotubes;Aligned growth;Self-bias;Microwave plasma chemical vapor deposition
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