TY - JOUR
T1 - Gas analysis of the CVD process for high yield growth of carbon nanotubes over metal-supported catalysts
AU - Ago, Hiroki
AU - Uehara, Naoyasu
AU - Yoshihara, Naoki
AU - Tsuji, Masaharu
AU - Yumura, Motoo
AU - Tomonaga, Nariyuki
AU - Setoguchi, Toshihiko
N1 - Funding Information:
This work is supported by the Nano-Carbon Technology (NCT) Project of NEDO, CREST-JST, and a joint project of the Chemical Synthesis Core Research Institutions. HA acknowledges support from the Grant-in-Aid for Scientific Research from the MEXT (#18681020) and the Industrial Technology Research Program in 2005 from NEDO.
PY - 2006/11
Y1 - 2006/11
N2 - 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%.
AB - 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%.
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U2 - 10.1016/j.carbon.2006.05.049
DO - 10.1016/j.carbon.2006.05.049
M3 - Article
AN - SCOPUS:33748790703
VL - 44
SP - 2912
EP - 2918
JO - Carbon
JF - Carbon
SN - 0008-6223
IS - 14
ER -