Open AccessInfrared absorption change in single‐walled carbon nanotubes observed by combination spectroscopy of synchrotron radiation and laser
Author(s) -
Azuma Junpei,
Itoh Minoru,
Koike Masahiro,
Kamada Masao,
Endo Morinobu
Publication year - 2006
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049506034650
Subject(s) - excited state , materials science , carbon nanotube , synchrotron radiation , spectroscopy , laser , absorption (acoustics) , sapphire , drude model , infrared , synchrotron , absorption spectroscopy , infrared spectroscopy , atomic physics , molecular physics , optics , chemistry , nanotechnology , physics , organic chemistry , quantum mechanics , composite material
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.