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Double-wall carbon nanotubes ͑DWNT's͒ have been studied by Raman scattering using different excitation wavelengths and their spectra compared to those of single wall nanotubes ͑SWNT's͒ and C 60-SWNT peapods. Raman scattering from the radial and tangential vibrational modes of very small diameter dϳ0.6–0.9 nm secondary ͑interior͒ semiconducting tubes within(More)
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