Phys. Rev. B 76, 113402 (2007) [4 pages]Identification of inner and outer shells of double-wall carbon nanotubes using high-pressure Raman spectroscopyReceived 13 April 2007; revised 12 July 2007; published 7 September 2007 The high-pressure Raman response of double-wall carbon nanotubes (DWCNTs) in the radial breathing mode (RBM) frequency region can be used for the identification of both the inner and their respective outer tubes. A simple anharmonic model of this system demonstrates that the pressure response of the inner tube in a DWCNT is uniquely defined by the inner-outer tube spacing. Consequently, a plot of the normalized pressure coefficients of the inner tube RBM frequencies as a function of their ambient pressure frequency serves as a map which allows the identification of unknown DWCNTs. The present experimental results form the basis of such a plot. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.76.113402
DOI:
10.1103/PhysRevB.76.113402
PACS:
78.67.Ch, 62.50.+p, 63.22.+m, 78.30.Na
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