Methane-assisted chemical vapor deposition yielding millimeter-tall single-wall carbon nanotubes of smaller diameter

Zhongming Chen, Dong Young Kim, Kei Hasegawa, Suguru Noda

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    We examined the use of low purity H2 (96 vol % H2 with 4 vol % CH4) in chemical vapor deposition (CVD) using a C 2H2 feedstock, and obtained vertically aligned single-wall carbon nanotubes (VA-SWCNTs) with unexpectedly smaller diameters, larger height, and higher quality compared with those grown using pure H2. During the catalyst annealing, carbon deposited at a small amount from CH 4 on the Fe particles, which kept them small and dense. During CVD, CH4 prevented the Fe particles from coarsening, resulting in an enhanced growth lifetime and suppressed diameter increase of growing SWCNTs. These effects were observed only for CH4, and not for C 2H4 or C2H2. CH4-assisted CVD is an efficient and practical method that uses H2 containing CH4 that is available as a byproduct in chemical factories.

    Original languageEnglish
    Pages (from-to)6719-6728
    Number of pages10
    JournalACS Nano
    Volume7
    Issue number8
    DOIs
    Publication statusPublished - 2013 Aug 27

    Fingerprint

    Carbon Nanotubes
    Methane
    Chemical vapor deposition
    Carbon nanotubes
    methane
    carbon nanotubes
    vapor deposition
    Coarsening
    industrial plants
    Feedstocks
    Byproducts
    Industrial plants
    purity
    Carbon
    Annealing
    methylidyne
    catalysts
    life (durability)
    Catalysts
    annealing

    Keywords

    • CH addition
    • chemical vapor deposition
    • Fe catalyst nanoparticles
    • H annealing
    • Ostwald ripening
    • single-wall carbon nanotubes

    ASJC Scopus subject areas

    • Engineering(all)
    • Materials Science(all)
    • Physics and Astronomy(all)

    Cite this

    Methane-assisted chemical vapor deposition yielding millimeter-tall single-wall carbon nanotubes of smaller diameter. / Chen, Zhongming; Kim, Dong Young; Hasegawa, Kei; Noda, Suguru.

    In: ACS Nano, Vol. 7, No. 8, 27.08.2013, p. 6719-6728.

    Research output: Contribution to journalArticle

    Chen, Zhongming ; Kim, Dong Young ; Hasegawa, Kei ; Noda, Suguru. / Methane-assisted chemical vapor deposition yielding millimeter-tall single-wall carbon nanotubes of smaller diameter. In: ACS Nano. 2013 ; Vol. 7, No. 8. pp. 6719-6728.
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