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The 0.9 eV Absorption Band of Polyaniline: A Morphologically Sensitive Electronic Absorption

Published online by Cambridge University Press:  25 February 2011

D. Zhang ,
J.-H. Hwang  and
S. C. Yang
D. Zhang
Affiliation:
Department of Chemistry, University of Rhode Island, Kingston, RI 02881
J.-H. Hwang
Affiliation:
Department of Chemistry, University of Rhode Island, Kingston, RI 02881
S. C. Yang
Affiliation:
Department of Chemistry, University of Rhode Island, Kingston, RI 02881
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Extract

The optical absorption spectra of polyaniline in the visible and UV spectral regions have been characterized before. The electrically conductive form has a band gap absorption at 3.8 eV and polaron absorptions at 2.9 and 1.5 eV [1,2] . An additional electronic absorption band at 0.9 eV was found to be also related to the existence of polaron. The assignment of this transition has yet to be made. Epstein and co-workers [31 have found a photo-induced absorption band at 0.9 eV by photo-exciting emeraldine base (insulator) with 2.0 eV light. It is not known yet whether these two 0.9 eV transitions belong to the same set of electronic energy levels of polaron, or they belong to two different electronic systems but are coincidentally have the same transition energy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 173: Symposium Q – Advanced Organic Solid State Materials , 1989 , 305
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

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