Synthesis of horizontally-aligned single-walled carbon nanotubes with controllable density on sapphire surface and polarized Raman spectroscopy

Hiroki Ago, Naoyasu Uehara, Ken ichi Ikeda, Ryota Ohdo, Kazuhiro Nakamura, Masaharu Tsuji

    Research output: Contribution to journalArticle

    60 Citations (Scopus)

    Abstract

    We report on the facile synthesis of aligned single-walled carbon nanotube (SWNT) arrays with controllable density on A-face sapphire substrates and the measurement of their polarized Raman spectra. The catalyst was prepared by simply dipping the sapphire substrate into a mixed solution of iron nitrate and molybdenum acetate, where Mo improved the nanotube yield as well as reproducibility. The angle dependence of the Raman spectra measured for the high-density nanotube array indicated the growth of SWNTs aligned mainly in the [ 1 over(1, ̄) 0 0 ] direction and two other directions. This suggests multiple mechanisms for the alignment, such as the pseudo one-dimensional Al arrangement and the presence of shallow grooves.

    Original languageEnglish
    Pages (from-to)399-403
    Number of pages5
    JournalChemical Physics Letters
    Volume421
    Issue number4-6
    DOIs
    Publication statusPublished - Apr 15 2006

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy(all)
    • Physical and Theoretical Chemistry

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