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Gas analysis of the CVD process for high yield growth of carbon nanotubes over metal-supported catalysts |
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| Authors: | Hiroki Ago Naoyasu Uehara Masaharu Tsuji Motoo Yumura Toshihiko Setoguchi |
| Affiliation: | a Institute for Materials Chemistry and Engineering, Kyushu University and CREST-JST, Kasuga, Fukuoka 816-8580, Japan b Graduate School of Engineering Sciences, Kyushu University, Fukuoka 816-8580, Japan c Research Center for Advanced Carbon Materials, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan d Nagasaki Research and Development Center, Technical Headquarter, Mitsubishi Heavy Industries, Ltd., Nagasaki 851-0392, Japan |
| Abstract: | Changes in the gas composition during the methane chemical vapor deposition growth of single- and double-walled carbon nanotubes over metal-supported MgO catalysts were investigated in an attempt to increase the nanotube yield. Monitoring the gas composition by gas chromatography as a function of the reaction time provides information on the activity and lifetime of the catalyst. The degree of methane decomposition, i.e., the C-H bond dissociation, was closely related to the nanotube yield, and the Fe-Mo binary catalyst exhibited a high activity. The effects of water vapor on the catalytic nanotube growth were also studied by introducing water vapor in the inlet gas. An appropriate amount of water prolonged the lifetime of the catalyst and increased the nanotube yield by 35%. |
| Keywords: | Carbon nanotubes Chemical vapor deposition Catalyst Chromatography Carbon yield |
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