A systematic resonance Raman study has been carried out on DNA-wrapped single walled carbon nanotubes (SWCNTs) of three different average lengths 〈Ltube〉 using seven different values of laser excitation energy Elaser. The dependence of the intensity ratio of the D-band and G-band Raman features (ID/IG) on 〈L tube〉 indicates that nanotube length can be used as an important structural parameter for Raman characterization. By systematically varying Elaser, the ratio ID/IG is found to be much stronger for metallic than for semiconducting SWCNTs but appears to have the same functional dependence on Elaser and 〈Ltube〉 or crystallite size as does nanographite.
|Journal||Applied Physics Letters|
|Publication status||Published - 2007|
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)