Phonon control in metallic carbon nanotubes due to laser-induced defects

Kang, D.; Kato, K.; Kojima, K.; Uchida, T.; Tachibana, M.
September 2008
Applied Physics Letters;9/29/2008, Vol. 93 Issue 13, p133102
Academic Journal
Single-walled carbon nanotubes (SWNTs) irradiated with laser were investigated by Raman spectroscopy. The intensity of D band related to defects increased with the laser irradiation. It should be noticed that the corresponding change was observed for G- peak associated with metallic SWNTs that is related to the electron-phonon coupling with Kohn anomaly. The upshift and narrowing of the G- peak occur due to the laser irradiation. The G- peak can recover the original one due to the thermal annealing. On the other hand, G band associated with semiconducting SWNTs remained unchanged even after the laser irradiation. This means that the laser-induced defects significantly affect phonons in metallic SWNTs, compared with semiconducting ones, and can control the electron-phonon coupling.


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