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Ultrafast Transient Absorption Spectroscopy Investigations of Excited State Dynamics in SWNT/Polymer Composites

Published online by Cambridge University Press:  01 February 2011

David J. Styers-Barnett ,
Steven P. Ellison ,
Cheol Park ,
Kristopher E. Wise  and
John M. Papanikolas
David J. Styers-Barnett
Affiliation:
Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599–3290
Steven P. Ellison
Affiliation:
Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599–3290
Cheol Park
Affiliation:
National Institute of Aerospace, NASA Langley Research Center, MS 226, Hampton, VA 23681–2199
Kristopher E. Wise
Affiliation:
National Institute of Aerospace, NASA Langley Research Center, MS 226, Hampton, VA 23681–2199
John M. Papanikolas
Affiliation:
Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599–3290
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Abstract

Wavelength-resolved femtosecond transient absorption spectroscopy is used to follow the electronic dynamics of single-walled carbon nanotubes in polymers following visible and near IR photoexcitation. Electron-hole (e-h) pairs give rise to sharp features in the transient spectra that decay in amplitude and exhibit rapid spectral shifts. The decay reflects (e-h) recombination on both short (1.3 ps) and long (35 ps) time scales. Transient spectra also exhibit a broad photobleach at early times that arises from the cooling of a hot electron gas created via excitation at the red edge of a π-plasmon band.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 858: Symposium HH – Functional Carbon Nanotubes , 2004 , HH10.5
Copyright
Copyright © Materials Research Society 2005

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References

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