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Pump-probe spectroscopy of exciton dynamics in (6,5) carbon nanotubes

Pump-probe spectroscopy of exciton dynamics in (6,5) carbon nanotubes
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 tentatively attributed to subdiffusive trapping of dark excitons. Spectral transients of bright singlet excitons within the E11 and E22 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 E11 manifold.
1932-7447
3831–3835
Zhu, Zipeng
5731e522-931c-4513-a4b5-a07e1d4fac31
Crochet, Jared
5ca0ecbe-5974-4f5c-b6cf-c7941f30f13c
Arnold, Michael S.
7c29a8c0-7c9f-4685-8e58-a8c10203ab53
Hersam, Mark C.
b7fdf8a4-f148-4593-9c74-dfa9d5a555d7
Ulbricht, Hendrik
5060dd43-2dc1-47f8-9339-c1a26719527d
Resasco, Daniel
fea1d8cf-4a32-4092-995b-7fd82c5a78a3
Hertel, Tobias
21a7bbb5-4907-4fd4-a86c-8dca4b7a1e60
Zhu, Zipeng
5731e522-931c-4513-a4b5-a07e1d4fac31
Crochet, Jared
5ca0ecbe-5974-4f5c-b6cf-c7941f30f13c
Arnold, Michael S.
7c29a8c0-7c9f-4685-8e58-a8c10203ab53
Hersam, Mark C.
b7fdf8a4-f148-4593-9c74-dfa9d5a555d7
Ulbricht, Hendrik
5060dd43-2dc1-47f8-9339-c1a26719527d
Resasco, Daniel
fea1d8cf-4a32-4092-995b-7fd82c5a78a3
Hertel, Tobias
21a7bbb5-4907-4fd4-a86c-8dca4b7a1e60

Zhu, Zipeng, Crochet, Jared, Arnold, Michael S., Hersam, Mark C., Ulbricht, Hendrik, Resasco, Daniel and Hertel, Tobias (2006) Pump-probe spectroscopy of exciton dynamics in (6,5) carbon nanotubes. The Journal of Physical Chemistry C, 111 (10), 3831–3835. (doi:10.1021/jp0669411). (In Press)

Record type: Article

Abstract

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 E11 and E22 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 E11 manifold.

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Accepted/In Press date: 19 December 2006

Identifiers

Local EPrints ID: 418195
URI: https://eprints.soton.ac.uk/id/eprint/418195
ISSN: 1932-7447
PURE UUID: 1316708e-3e62-425c-9a26-f7d5c8f14361

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Date deposited: 23 Feb 2018 17:30
Last modified: 13 Mar 2019 18:52

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Contributors

Author: Zipeng Zhu
Author: Jared Crochet
Author: Michael S. Arnold
Author: Mark C. Hersam
Author: Daniel Resasco
Author: Tobias Hertel

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