Abstract
We study the photo-induced transmission change (ΔT/T) upon quasi-continuum laser excitation, for different modulation frequency and excitation intensity in films of (6, 5) enriched CoMoCat single wall nanotubes (SWNTs) embedded in a polymeric matrix. This technique probes long-lived excited species, with lifetime in the 1 ms–1 s domain. The observed line-shape of ΔT/T spectra that can be assigned to a superposition of ground state bleaching and absorption modulation. We speculate that photo-excitation creates charges which get trapped in the sample, acquiring ms lifetime. This causes bleaching of the ground state absorption due to state filling and possibly a tube diameter expansion, with consequent blue shift of the optical transition.
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Sciascia, C., Crochet, J., Hertel, T. et al. Long lived photo excitations in (6, 5) carbon nanotubes. Eur. Phys. J. B 75, 115–120 (2010). https://doi.org/10.1140/epjb/e2009-00374-1
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DOI: https://doi.org/10.1140/epjb/e2009-00374-1