Semi-quantitative study on the fabrication of densely packed and vertically aligned single-walled carbon nanotubes |
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Authors: | Guo Fang Zhong Takayuki Iwasaki Hiroshi Kawarada |
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Affiliation: | School of Science and Engineering, Waseda University, Building 61-504, Okubo 3-4-1, Shinjuku-ku, Tokyo 169-8555, Japan |
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Abstract: | This paper presents, for the first time, a semi-quantitative study on the production of densely packed and vertically aligned (DPVA) single-walled carbon nanotubes (SWNTs) from ultra-thin catalytic films. An up-to-date highest volume density (60-70 kg m−3) and the corresponding high surface density on the order of 1016 m−2 of DPVA-SWNTs have been achieved by point-arc microwave plasma chemical vapor deposition. The precise thickness control of the sandwich-like catalytic nanostructure of 0.5 nm Al2O3/0.5 nm Fe/>5 nm Al2O3, developed by the authors, and a short-time (5 min) heat pretreatment of substrates at a temperature as low as 600 °C play the very key role in the process of fabricating DPVA-SWNTs. |
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Keywords: | Carbon nanotubes Chemical vapor deposition Catalyst Density Particle size |
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