Surfactant free thin films of single-wall carbon nanotubes (SWNTs) have been prepared
and their spectral and time resolved transient absorption signatures have been evaluated
within the region of their first exciton (E1) absorption.
Doped samples show a stable bleaching of the E1 absorption which reveals a transient
photoinduced absorption due to the excited state transition from the E1 to the E2
Baked samples show recovery of the intrinsic optical properties of our SWNTs with
a uniform transient photoinduced bleach over the whole E1 spectral region.