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

    研究成果: Contribution to journalArticle査読

    31 被引用数 (Scopus)

    抄録

    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.

    本文言語英語
    ページ(範囲)13247-13253
    ページ数7
    ジャーナルJournal of Physical Chemistry C
    115
    27
    DOI
    出版ステータス出版済み - 7 14 2011

    All Science Journal Classification (ASJC) codes

    • 電子材料、光学材料、および磁性材料
    • エネルギー(全般)
    • 物理化学および理論化学
    • 表面、皮膜および薄膜

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