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Nonlinear Optical Properties of Polyaniline

Published online by Cambridge University Press:  25 February 2011

A. J. Epstein ,
J. M. Ginder ,
M. G. Roe ,
T. L. Gustafson ,
M. Angelopoulos  and
A. G. Macdiarmid
A. J. Epstein
Affiliation:
Department of Physics and Department of Chemistry, The Ohio State University, Columbus, Ohio 43210-1106
J. M. Ginder
Affiliation:
Department of Physics, The Ohio State University, Columbus, Ohio 43210-1106
M. G. Roe
Affiliation:
Department of Physics, The Ohio State University, Columbus, Ohio 43210-1106
T. L. Gustafson
Affiliation:
Sohio R&D, Cleveland, Ohio 44128
M. Angelopoulos
Affiliation:
Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323
A. G. Macdiarmid
Affiliation:
Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323
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Abstract

Polyaniline is a family of polymers whose electronic and optical properties can be controlled through variation of the number of electrons and protons on the polymer chain. For example, the emeraldine base form of the polymer (EB) is insulating while the emeraldine salt form (ES) is metallic. We present here results for photoinduced absorption spectroscopy of the emeraldine base form of polyaniline. Unlike earlier studied polymers, the spectrum of emeraldine base contains both subgap photoinduced bleaching (at 1.8 eV) and photoinduced absorption (at 0.9, 1.4, and 3.0 eV). The existence of the bleaching peak is consistent with a model of optically excited localized molecular excitons in the emeraldine base polymer. The energies of the three photoinduced absorptions peaks and an associated interband bleaching (at energies greater than ∼3.5 eV) are in agreement with the photogeneration of polaron pairs. Laser intensity studies support that the excitons decay monomolecularly while the polarons decay bimolecularly. Picosecond time-resolved spectroscopy of the exciton decay demonstrates the rapid response of this system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 109: Symposium K – Nonlinear Optical Properties of Polymers , 1987 , 313
Copyright
Copyright © Materials Research Society 1988

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References

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