Pump-Probe Spectroscopy of Exciton Dynamics in (6,5) Carbon Nanotubes

We investigate exciton dynamics in isopycnically enriched (6,5) nanotube-DNA suspensions using femtosecond time-resolved pump−probe spectroscopy. The ground state recovery is characterized by a t -0.45 ± 0.03 power law behavior, indicative of a one-dimensional diffusion-limited reaction that is tent...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2007-03, Vol.111 (10), p.3831-3835
Main Authors: Zhu, Zipeng, Crochet, Jared, Arnold, Michael S, Hersam, Mark C, Ulbricht, Hendrik, Resasco, Daniel, Hertel, Tobias
Format: Article
Language:English
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Summary:We investigate exciton dynamics in isopycnically enriched (6,5) nanotube-DNA suspensions using femtosecond time-resolved pump−probe spectroscopy. The ground state recovery is characterized by a t -0.45 ± 0.03 power law behavior, indicative of a one-dimensional diffusion-limited reaction that is tentatively attributed to subdiffusive trapping of dark excitons. Spectral transients of bright singlet excitons within the E 11 and E 22 manifolds exhibit a photobleach (PB) and a photoabsorption (PA) signal of similar strength. The PA is blue-shifted with respect to the PB-signal by 7.5 meV and is attributed to a transition from the dark singlet exciton to a  +  state within the two exciton E 11 manifold.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp0669411