Synthesis of ultrafine Gd2O3 nanoparticles inside single-wall carbon nanohorns

Jin Miyawaki, Masako Yudasaka, Hideto Imai, Hideki Yorimitsu, Hiroyuki Isobe, Eiichi Nakamura, Sumio Iijima

    Research output: Contribution to journalArticlepeer-review

    68 Citations (Scopus)


    The large diameter of single-wall carbon nanohorns (SWNHs) allows various molecules to be easily incorporated in hollow nanospaces. In this report, we prove that the nanospaces of SWNHs even work as the chemical reaction field at high temperature; that is, Gd-acetate clusters inside SWNHs were transformed into ultrafine Gd2O3 nanoparticles with their particle size retained even after heat-treatment at 700°C. This indicates that the confinement of the Gd-acetate clusters in a deep potential well of the SWNH nanospaces prevented a migration to form larger particles, giving rise to ultrafine Gd2O3 nanoparticles of 2.3 nm in average diameter, which is much smaller than the case without SWNHs. The Gd 2O3 nanoparticles thus obtained were demonstrated to be actually useful to the magnetic resonance imaging. We believe that the presented effectiveness of the inner hollow spaces of SWNHs, therefore, also those of the carbon nanotubes, for high-temperature chemical reactions should be highlighted, and that the thus produced novel nanomaterials are promising to expand the fields of nanoscience.

    Original languageEnglish
    Pages (from-to)5179-5181
    Number of pages3
    JournalJournal of Physical Chemistry B
    Issue number11
    Publication statusPublished - 2006 Mar 23

    ASJC Scopus subject areas

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


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