Investigation of spectroscopic and electrical properties of doped poly(pyrrole-3-carboxylic acid)

Adam Mizera; Alina T Dubis; Paweł Ławniczak; Karolina H Markiewicz; Adam Ostrowski; Andrzej Łapiński

doi:10.1016/j.saa.2024.124368

Investigation of spectroscopic and electrical properties of doped poly(pyrrole-3-carboxylic acid)

Spectrochim Acta A Mol Biomol Spectrosc. 2024 Sep 5:317:124368. doi: 10.1016/j.saa.2024.124368. Epub 2024 Apr 27.

Authors

Adam Mizera¹, Alina T Dubis², Paweł Ławniczak³, Karolina H Markiewicz², Adam Ostrowski³, Andrzej Łapiński³

Affiliations

¹ Institute of Molecular Physics, Polish Academy of Sciences, Mariana Smoluchowskiego 17, 60-179, Poznań, Poland. Electronic address: mizera@ifmpan.poznan.pl.
² Faculty of Chemistry, University of Bialystok, Ciołkowskiego 1K, 15-245, Białystok, Poland.
³ Institute of Molecular Physics, Polish Academy of Sciences, Mariana Smoluchowskiego 17, 60-179, Poznań, Poland.

PMID: 38733910
DOI: 10.1016/j.saa.2024.124368

Abstract

The spectroscopic and electrical properties of poly(pyrrole-3-carboxylic acid) doped with p-TSA^- (p-toluenesulfonate) and AQS^- (anthraquinone sulfonate) were investigated. The variation in electrical conductivity as a function of temperature shows that the systems have semiconductor-like electrical characteristics. The investigated polymers exhibit 3D conductivity and less than 0.6 eV energy gaps. The IR and Raman spectra show that the charge carriers are polarons and bipolarons. Doping the poly(pyrrole-3-carboxylic acid) increases the number of charge carriers. Electron paramagnetic resonance has shown that localized polarons and bipolarons are formed within these polymers.

Keywords: DFT and TD-DFT calculations; Electrical properties; IR and Raman spectroscopy; Polypyrrole derivatives.