Surface-enhanced Raman scattering from small numbers of purified and oxidised single-walled carbon nanotubes

► Surface-enhanced Raman scattering spectra of purified and oxidised single walled carbon nanotubes. ► Potential evidence for the presence of Stone-Thrower-Wales and heptagonal-pentagonal intramolecular junction defects. ► Effect of chemical introduction of carboxylic acid moieties to the surface of the nanotubes.