Abstract
AbstractIn this paper we briefly review the high pressure Raman studies on single and double walled carbon nanotubes focussing on the perssure dependence of the low frequency radial breathing vibrational modes. Previous work on single walled carbon nanotube bundles have shown that the normalized pressure‐induced frequency shift, Φ = (1/ωR) (dωR/dP) ∼ D2, where ωR is the radial mode frequency and D is the nanotube diameter. We show here that the R‐modes due to the inner tubes in double walled carbon nanotubes, have a very small, diameter independent value for Φ, as predicted for the case of isolated tubes. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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