Raman D-band spectra are reported for several different SWNTs using two different laser energies (Elaser =1.58 and 2.41 eV). At a fixed Elaser, individual isolated SWNTs exhibit different diameter-dependent D-band frequencies ωD around an average value. For both semiconducting and metallic tubes, ωD decreases with decreasing nanotube diameter, though ωD for isolated metallic SWNTs is higher than for isolated semiconducting SWNTs. The average D-band frequency depends linearly on Elaser, as previously observed for SWNT bundles, suggesting that the D-band in SWNTs is activated by defects or by the finite size of the SWNTs.
|Number of pages||4|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2001 Jul 15|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics