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Raman signature to identify the structural transition of single-wall carbon nanotubes under high pressure
Umeå University, Faculty of Science and Technology, Physics.
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2008 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, Vol. 78, no 20, 205411- p.Article in journal (Refereed) Published
Abstract [en]

Raman spectra of single-walled carbon nanotubes (SWNTs) with diameters of 0.6–1.3 nm have been studied under high pressure. A “plateau” in the pressure dependence of the G-band frequencies was observed in all experiments, both with and without pressure transmission medium. Near the onset of the G-band plateau, the corresponding radial breathing mode (RBM) lines become very weak. A strong broadening of the full width at half maximum of the RBMs just before the onset of the G-band plateau suggests that a structural transition starts in the SWNTs. Raman spectra from SWNTs released from different pressures also indicate that a significant structural transition occurs during the G-band plateau process. Simulations of the structural changes and the corresponding Raman modes of a nanotube under compression show a behavior similar to the experimental observations. Based on the experimental results and the theoretical simulation, a detailed model is suggested for the structural transition of SWNTs, corresponding to the experimentally obtained Raman results in the high-pressure domain.

Place, publisher, year, edition, pages
2008. Vol. 78, no 20, 205411- p.
Keyword [en]
carbon nanotubes, high-pressure effects, Raman spectra, solid-state phase transformations
National Category
Condensed Matter Physics
Research subject
URN: urn:nbn:se:umu:diva-11386DOI: doi:10.1103/PhysRevB.78.205411OAI: diva2:151057
Available from: 2008-12-17 Created: 2008-12-17 Last updated: 2009-03-13Bibliographically approved

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Yao, MingguangSundqvist, Bertil
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