Abstract
AbstractRaman spectra of individual double wall carbon nanotubes(DWs) on silica show a splitting of the G band due to contributions of the inner and outer tube when using a excitation energy in resonance with the inner metallic tube and outer semiconducting tube. The spectral splitting indicates strong coupling while a previous report [Nanoletters 8, 3879 (2008)] shows uncoupled inner and outer tubes. The spectral line widths are comparable to what has been observed for individual single wall carbon nanotubes (SWs) or graphene. The spectral position of the inner tube is consistent with previous extrapolations from measurements under high pressure and on chemically doped double wall tubes. Bundling of DWs leads to heterogeneous increase of the G band line width. Increased laser power shifts the G band of the outer tube to higher energies and modifies its line shape.
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