Raman spectroelectrochemical study of electrodeposited polyaniline doped with polymeric sulfonic acids of different structuresстатья
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Дата последнего поиска статьи во внешних источниках: 26 декабря 2017 г.
Аннотация:Polyaniline (PANI) films were prepared by
electrochemical polymerization of aniline on Pt-electrode
in aqueous medium in the presence of polymeric sulfonic
acids distinguished by different flexibility of the polymer
chain: (1) poly(2-acrylamido-2-methyl-1-propanesulfonic
acid) (PAMPSA, flexible chain); (2) poly(4-styrenesulfonic
acid) (PSSA, flexible chain), (3) poly-4,40-(2,20-disulfoacid)-
diphenylene-iso-phthalamide (i-PASA, semi-rigid
chain); and (4) poly-4,40-(2,20-disulfoacid)-diphelylenetere-
phthalamide (t-PASA, rigid chain). Raman spectroelectrochemical
studies using 532 nm laser excitation were
carried out in aqueous HCl. The conventional HCl-doped
PANI films were also studied for comparison. The results
allowed one to distinguish the potential-dependent vibrations
belonging to PANI and potential-independent vibrations
belonging to the polyacids. In addition, amide C=O
vibration was separated in the spectra by comparing the
results for amide-containing (PAMPSA, i-PASA, and
t-PASA) and amide-free (PSSA) PANI-polyacid complexes.
The films of PANI-polyacid complexes demonstrated
increased content of radical cation moieties at low
potentials compared to PANI–HCl films.