Infrared absorption change in single-walled carbon nanotubes observed by combination spectroscopy of synchrotron radiation and laser.
The Drude tail due to photo-excited carriers in single-walled carbon nanotubes (SWNTs) has been observed in the mid-infrared region by using combination spectroscopy of synchrotron radiation and Ti:sapphire laser. It is found that the density of photo-excited carriers increases as the sample temperature is raised from 12 to 300 K, and their lifetime is of the order of minutes at 300 K. These facts suggest that the movement of photo-excited carriers is largely affected by some extrinsic defect, thus resulting in the long-lasting Drude reflection in SWNTs.
Azuma
Junpei
J
Synchrotron Light Application Center, Saga University, Honjo 1, Saga 840-8502, Japan. azuma@cc.saga-u.ac.jp
Itoh
Minoru
M
Koike
Masahiro
M
Kamada
Masao
M
Endo
Morinobu
M
D000042:Absorption; D007259:Infrared Rays; D007834:Lasers; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000528:radiation effects; D011829:Radiation Dosage; D011874:Radiometry / Q000379:methods*; D012542:Scattering, Radiation; D013052:Spectrometry, X-Ray Emission / Q000379:methods*; D017356:Synchrotrons
D037742:Nanotubes, Carbon