Selective etching of thin single-walled carbon nanotubes

Raman spectroscopy and in situ Raman spectroelectrochemistry are used for studying the selective etching of thin tubes by lithium vapor in doped single-walled carbon nanotubes (SWCNTs). The strong doping of SWCNTs after the reaction with Li vapor is confirmed by the vanishing of the radial breathing mode (RBM) and by a strong attenuation of the tangential displacement (TG) band in the Raman spectra.