Gas analysis of the CVD process for high yield growth of carbon nanotubes over metal-supported catalysts

Hiroki Ago, Naoyasu Uehara, Naoki Yoshihara, Masaharu Tsuji, Motoo Yumura, Nariyuki Tomonaga, Toshihiko Setoguchi

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    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%.

    Original languageEnglish
    Pages (from-to)2912-2918
    Number of pages7
    JournalCarbon
    Volume44
    Issue number14
    DOIs
    Publication statusPublished - Nov 1 2006

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    All Science Journal Classification (ASJC) codes

    • Chemistry(all)
    • Materials Science(all)

    Cite this

    Ago, H., Uehara, N., Yoshihara, N., Tsuji, M., Yumura, M., Tomonaga, N., & Setoguchi, T. (2006). Gas analysis of the CVD process for high yield growth of carbon nanotubes over metal-supported catalysts. Carbon, 44(14), 2912-2918. https://doi.org/10.1016/j.carbon.2006.05.049