Abstract
In situ near-infrared (NIR) spectroelectrochemical studies during growth and dedoping/redoping of polyaniline (PANI) in the range between 1200 to 3000 nm are carried out in 1 M aqueous solutions of HCl, H2SO4, and HClO4 acids andp-toluene sulfonic acid (PTSA). The results show three characteristic absorption bands around 1440, 1900, and 2500 nm. The band at 2500 nm is characteristic of mobile charge carriers. The PANI prepared in HClO4 keeps memory of the size of the doping anion (ClO4 –) and can be redoped only with the same or smaller anions (Cl– and SO4 2– or HSO4 –) while it cannot be redoped to any significant extent by a larger anion (PTSA–).
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Abd-Elwahed, A., Holze, R. In situ Near-Infrared Spectroelectrochemical Investigation of Redox States of Polyaniline during Growth and Doping. Russian Journal of Electrochemistry 39, 391–396 (2003). https://doi.org/10.1023/A:1023362022928
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DOI: https://doi.org/10.1023/A:1023362022928