Molecular dynamics and phase transition in one-dimensional crystal of C 60 encapsulated inside single wall carbon nanotubes

Edy Abou Hamad, Y. Kim, T. Wågberg, D. Boesch, S. Aloni, A. Zettl, A. Rubio, D. E. Luzzi, C. Goze-Bac*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    30 Scopus citations

    Abstract

    One-dimensional crystals of 25% 13C-enriched C 60 encapsulated inside highly magnetically purified SWNTs were investigated by following the temperature dependence of the 13C NMR line shapes and the relaxation rates from 300 K down to 5 K. High-resolution MAS techniques reveal that 32% of the encapsulated molecules, so-called the C 60 α, are blocked at room temperature and 68%, labeled C 60 β, are shown to reversly undergo molecular reorientational dynamics. Contrary to previous NMR studies, spin-lattice relaxation time reveals a phase transition at 100 K associated with the changes in the nature of the C 60 β dynamics. Above the transition, the C 60 β exhibits continuous rotational diffusion; below the transition, C 60 β executes uniaxial hindered rotations most likely along the nanotubes axis and freeze out below 25 K. The associated activation energies of these two dynamical regimes are measured to be 6 times lower than in fcc-C 60, suggesting a quiet smooth orientational dependence of the interaction between C 60 β molecules and the inner surface of the nanotubes.

    Original languageEnglish (US)
    Pages (from-to)3878-3883
    Number of pages6
    JournalACS Nano
    Volume3
    Issue number12
    DOIs
    StatePublished - Dec 22 2009

    Keywords

    • Carbon nanostructures
    • Dynamical properties
    • Nuclear magnetic resonance
    • Phase transition

    ASJC Scopus subject areas

    • Materials Science(all)
    • Engineering(all)
    • Physics and Astronomy(all)

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