Ultrahigh-vacuum-assisted control of metal nanoparticles for horizontally aligned single-walled carbon nanotubes with extraordinary uniform diameters

Hiroki Ago, Takafumi Ayagaki, Yui Ogawa, Masaharu Tsuji

    Research output: Contribution to journalArticle

    30 Citations (Scopus)

    Abstract

    Uniform diameter, horizontally aligned single-walled carbon nanotubes (SWNTs) are grown on sapphire substrate through the control of Fe nanoparticle size by annealing in ultrahigh vacuum (UHV). We find that thermal annealing in UHV reduces the Fe nanoparticle size and significantly narrows their size distribution. These size-controlled Fe nanoparticles enable the catalytic growth of uniformdiameter SWNTs while maintaining their horizontal alignment. Systematic analyses of Raman radial breathing modes with three laser wavelengths indicate that ∼76% of the horizontally aligned SWNTs have diameters in the range of 1.3-1.4 nm under optimized annealing conditions. Longer UHV annealing induces the increase in the Fe nanoparticle size, giving large-diameter SWNTs. Precise correlation between the metal nanoparticle size and SWNT diameter is demonstrated. Effects of UHV annealing on the nanoparticle size are discussed in terms of evaporation, subsurface diffusion, and surface precipitation of catalyst metals.

    Original languageEnglish
    Pages (from-to)13247-13253
    Number of pages7
    JournalJournal of Physical Chemistry C
    Volume115
    Issue number27
    DOIs
    Publication statusPublished - Jul 14 2011

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Energy(all)
    • Physical and Theoretical Chemistry
    • Surfaces, Coatings and Films

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