Journal
NANO LETTERS
Volume 7, Issue 7, Pages 2116-2121Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl0711155
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Resonance Raman spectra of individual strained ultralong single-wall carbon nanotubes (SWNTs) are studied. Torsional and uniaxial strains are introduced by atomic force microscopy manipulation. Torsional strain strongly affects the Raman spectra, inducing a large downshift in the E-2 symmetry mode in the G(+) band, but a slight upshift for the rest of the G modes and also an upshift in the radial breathing mode (RBM). Whereas uniaxial strain has no effect on the frequency of either the E-2 symmetry mode in the G(+) band or the RBM, it downshifts the rest of the G modes. The Raman intensity change reflects the effect of these strains on the SWNT electronic band structure.
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