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A series of studies have been carried out on polyaniline (emeraldine base; EB) thin films deposited on glass substrates from aqueous solutions of polymerizing aniline (“in-situ” EB-I film). These films exhibit a Vis/UV spectrum in which the exciton peak has an absorption maximum at ~600 nm. Exposure of EB-I film to NMP vapor results in a red-shift of the exciton peak to ~650 nm (EB-II film). Doping...
The UV/Vis spectrum of a freshly made chloroform solution of polyaniline (emeraldine base) doped by d,l-camphorsulfonic acid after filtration through a 0.22 μm filter has a localized polaron peak at ~730 nm. After stirring for ~72 hours at room temperature, this localized polaron peak shifts to ~810 nm. A change in color from “blue-green” to green can be observed visually. The GPC chromatogram of...
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