Abstract
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-4,4′-(2,2′-disulfoacid)-diphenylene-iso-phthalamide (i-PASA, semi-rigid chain); and (4) poly-4,4′-(2,2′-disulfoacid)-diphelylene-tere-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.
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Acknowledgements
This work was supported by the Russian Science Foundation (Grant No. 15-13-00170). O. Iakobson is grateful to the Grant Council of the President of the Russian Federation for financial support (SP-2994.2015.1).
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Nekrasov, A.A., Gribkova, O.L., Iakobson, O.D. et al. Raman spectroelectrochemical study of electrodeposited polyaniline doped with polymeric sulfonic acids of different structures. Chem. Pap. 71, 449–458 (2017). https://doi.org/10.1007/s11696-016-0087-2
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DOI: https://doi.org/10.1007/s11696-016-0087-2