We report the emergence of the D band Raman mode in single-walled carbon nanotubes under large axial strain. The D to G mode Raman intensity ratio (ID/IG) is observed to increase with strain quadratically by more than a factor of 100-fold. Up to 5% strain, all changes in the Raman spectra are reversible. The emergence of the D band, instead, arises from the reversible and elastic symmetry-lowering of the sp2 bonds structure. Beyond 5%, we observe irreversible changes in the Raman spectra due to slippage of the nanotube from the underlying substrate, however, the D band intensity resumes its original pre-strain intensity, indicating that no permanent defects are formed. © 2012 Tsinghua University Press and Springer-Verlag Berlin Heidelberg.
CITATION STYLE
Chang, C. C., Chen, C. C., Hung, W. H., Hsu, I. K., Pimenta, M. A., & Cronin, S. B. (2012). Strain-induced D band observed in carbon nanotubes. Nano Research, 5(12), 854–862. https://doi.org/10.1007/s12274-012-0269-3
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