Abstract
Previously unexplored low-frequency Raman modes of single-wall carbon nanotubes (SWNTs) are reported. Gold deposited onto a randomly-oriented top layer of vertically aligned carbon nanotube arrays was used to induce surface-enhanced Raman scattering (SERS) ``hot spots'' on large-diameter SWNTs with SERS intensities up to 1900 times greater than normal Raman intensities from undecorated arrays. The linewidths of the resonances (down to $0.3\text{ }{\text{cm}}^{\ensuremath{-}1}$) are ten times narrower than previously measured for individual SWNTs. Pairs of intense sharp resonances with identical excitation profiles were found and tentatively interpreted as the low-energy longitudinal optical and radial breathing modes of the same nanotube. SERS lines in the region of $14--30\text{ }{\text{cm}}^{\ensuremath{-}1}$ were tentatively assigned to the ring modes of SWNTs in agreement with existing theories.
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