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The Molecular Conformation of Non-Doped Polyaniline and its Effect on the Properties of Doped Polyaniline

Published online by Cambridge University Press:  10 February 2011

W. Zheng ,
Y. Min ,
S-J. Lee ,
A. G. Macdiarmid ,
M. Angelopoulos ,
Y-H. Liao  and
A. J. Epstein
W. Zheng
Affiliation:
Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323
Y. Min
Affiliation:
Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323
S-J. Lee
Affiliation:
Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323
A. G. Macdiarmid
Affiliation:
Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323
M. Angelopoulos
Affiliation:
IBM T.J. Watson Research Center, Yorktown Heights, NY 10598
Y-H. Liao
Affiliation:
IBM T.J. Watson Research Center, Yorktown Heights, NY 10598
A. J. Epstein
Affiliation:
Department of Physics, The Ohio State University, Columbus, OH 43210-1106
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Abstract

When thin films of polyaniline (emeraldine base, EB) are deposited on glass substrates from aqueous solutions of polymerizing aniline (“in-situ” EB-I film), they exhibit a Vis/UV spectrum in which the exciton peak has an absorption maximum at ∼600 nm; exposure to NMP vapor results in a shift of this peak to ∼650 nm (EB-II film). Doping of EBI film by aq. HCl gives the characteristic Vis/UV spectrum of “tight coil” doped polyaniline with a localized polaron peak at ∼820 nm. Treatment of EB-II film with HCl in a similar manner gives the characteristic spectrum of “expanded coil” doped polyaniline in which the ∼820 nm peak has disappeared and is replaced by a free carrier tail. It is concluded that EB-I and EB-II exist in “tight coil” and “expanded coil” molecular conformations respectively which do not change on doping in aqueous HCl.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 413: Symposium W – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials III , 1995 , 535
Copyright
Copyright © Materials Research Society 1996

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References

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