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Softening of the Radial Breathing Mode in Metallic Carbon Nanotubes
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SYSNO ASEP 0334490 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Softening of the Radial Breathing Mode in Metallic Carbon Nanotubes Title Zmenšování frekvence radiálního dýchacího modu v kovových uhlíkových nanotubách Author(s) Farhat, H. (ed. US)
Sasaki, K. (JP)
Kalbáč, Martin (UFCH-W) RID, ORCID
Hofmann, M. (US)
Saito, R. (JP)
Dresselhaus, M. S. (US)
Kong, J. (US)Source Title Physical Review Letters. - : American Physical Society - ISSN 0031-9007
Roč. 102, č. 12 (2009), 126804-1-126804-4Number of pages 4 s. Language eng - English Country US - United States Keywords metallic carbon nanotubes ; radial breathing mode ; single waled carbon nanotubes Subject RIV CG - Electrochemistry CEZ AV0Z40400503 - UFCH-W (2005-2011) UT WOS 000264632100052 DOI 10.1103/PhysRevLett.102.126804 Annotation The softening of the radial breathing mode (RBM) of metallic single walled carbon nanotubes (MSWNTs) due to electron-phonon coupling has been studied by observing the Fermi level (EF) dependence of the RBM Raman peak. In situ Raman spectra were obtained from several individual MSWNTs while varying EF electrochemically. The RBM frequency of an intrinsic MSWNT is shown to be down-shifted relative to highly doped tubes by ~2 cm-1. The down-shift is greatest for small diameter and small chiral angle SWNTs. Most tubes show no change in RBM linewidth. A comparison is drawn between the RBM and the G band (ALO phonon) with respect to the EF dependence of their frequencies and linewidths. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2010
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