Electrochemical and spectroscopic study on thiolation of polyaniline

Maija Blomquist, Johan Bobacka, Ari Ivaska, Kalle Levon

    Research output: Contribution to journalArticleScientificpeer-review

    20 Citations (Scopus)


    Polyaniline (PANI) is a conducting polymer, easily synthesized and lucrative for many electrochemical applications like ion-selective sensors and biosensors. Thiolated molecules, including biological ones, can be bound by nucleophilic attachment to the polyaniline backbone. These covalently bound thiols add functionality to PANI, but also cause changes in the electrochemical properties of PANI. Polyaniline studied in this work was electropolymerized on glassy carbon electrodes. 2-Mercaptoethanol (MCE) and 6-(ferrocenyl)hexanethiol (FCHT) were used as the thiols to form functionalized films. The films were characterized by cyclic voltammetry (CV), ex situ FTIR and Raman spectroscopies, electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS). The goal of this work was to confirm the thiolation by spectroscopic methods and to study the impact of thiolation on the electrochemical properties of PANI. Our study showed that thiolated PANI has different electrochemical properties than PANI. Although the thiolation partially reduced the PANI backbone it still remained conductive after the thiolation. Detailed understanding of the thiolation process can be very useful for future applications of PANI.
    Original languageUndefined/Unknown
    Pages (from-to)604–614
    Number of pages11
    JournalElectrochimica Acta
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed


    • Alkanethiol
    • Electrochemical impedance spectroscopy
    • FTIR spectroscopy
    • Raman spectroscopy
    • Thiolation
    • XPS

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