Abstract
It is acknowledged that conjugated polymers with highly extended π-electron system possess large femtosecond scale third-order nonlinearity. Among such polymers polyaniline (PANI) is unique because it exhibits drastic changes of properties upon protonic doping: protonation and deprotonation reactions leading to the formation of highly conducting, stable, delocalized polysemiquinone cation radical polymer salt, a polyelectrolyte macromolecule in which the molecular conformation (coil-like structure) depends on the doping [1].
© 1996 Optical Society of America
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