Raman D-band spectra are reported for several different SWNTs using two different laser energies (E laser =1.58 and 2.41 eV). At a fixed E laser , individual isolated SWNTs exhibit different diameter-dependent D-band frequencies ω D around an average value. For both semiconducting and metallic tubes, ω D decreases with decreasing nanotube diameter, though ω D for isolated metallic SWNTs is higher than for isolated semiconducting SWNTs. The average D-band frequency depends linearly on E laser , 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