Size control of metal nanoparticle catalysts for the gas-phase synthesis of single-walled carbon nanotubes

Takeshi Saito, Satoshi Ohshima, Wei Chun Xu, Hiroki Ago, Motoo Yumura, Sumio Iijima

    Research output: Contribution to journalArticle

    86 Citations (Scopus)

    Abstract

    Nanoparticle catalysts are essential and indispensable for all syntheses of single-walled carbon nanotubes (SWCNTs). We have prepared size-controlled Co, Co-Mo, and Fe-Mo nanoparticles by the reversed micelle method as the catalysts for the gas-phase pyrolytic synthesis of SWCNTs. From the investigation of the relation between the sizes of the nanoparticles and the alkyl-chain lengths of the cationic surfactants, dialkyldimethylammonium bromides, it has been found that the alkyl groups of the surfactants could play a role in controlling the sizes of the nanoparticles and that the alkyl chain of the surfactant should be preferably less than 10 carbon atoms at most to prepare smaller-size nanoparticles with a narrow size distribution. The reduction of the particle size increases the number of nanoparticles in the colloidal solution and leads to a higher yield of SWCNTs.

    Original languageEnglish
    Pages (from-to)10647-10652
    Number of pages6
    JournalJournal of Physical Chemistry B
    Volume109
    Issue number21
    DOIs
    Publication statusPublished - Jun 2 2005

    All Science Journal Classification (ASJC) codes

    • Physical and Theoretical Chemistry
    • Surfaces, Coatings and Films
    • Materials Chemistry

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