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Rotational dynamics of confined C60 from near-infrared Raman studies under high pressure
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2009 (English)In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 106, no 52, 22135-22138 p.Article in journal (Refereed) Published
Abstract [en]

Peapods present a model system for studying the properties of dimensionally constrained crystal structures, whose dynamical properties are very important. We have recently studied the rotational dynamics of C60 molecules confined inside single walled carbon nanotube (SWNT) by analyzing the intermediate frequency mode lattice vibrations using near-infrared Raman spectroscopy. The rotation of C60 was tuned to a known state by applying high pressure, at which condition C60 first forms dimers at low pressure and then forms a single-chain, nonrotating, polymer structure at high pressure. In the latter state the molecules form chains with a 2-fold symmetry. We propose that the C60 molecules in SWNT exhibit an unusual type of ratcheted rotation due to the interaction between C60 and SWNT in the “hexagon orientation,” and the characteristic vibrations of ratcheted rotation becomes more obvious with decreasing temperature.

Place, publisher, year, edition, pages
2009. Vol. 106, no 52, 22135-22138 p.
Keyword [en]
Single-walled carbon nanotubes, peapods, fullerene-filled nanotubes, Raman spectroscopy, high pressure, infra-red excitation, molecular rotation, fullerene dimers, fullerene chains
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-30483DOI: 10.1073/pnas.0911963106OAI: oai:DiVA.org:umu-30483DiVA: diva2:284104
Available from: 2010-01-04 Created: 2010-01-04 Last updated: 2017-12-12Bibliographically approved

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Yao, MingguangWågberg, ThomasSundqvist, Bertil
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