Poly(aniline) doped with 5-formyl-2-furansulfonic acid: A humidity memory

Marja Vilkman (Corresponding Author), Kaisa Lehtinen, Tapio Mäkelä, P. Rannou, O. Ikkala

    Research output: Contribution to journalArticleScientificpeer-review

    22 Citations (Scopus)


    We present a new concept for a humidity sensor based on doped poly(aniline) that shows irreversible changes of its sheet resistance and capacitance upon exposure to humid conditions, i.e. a humidity memory. Therein humidity triggers an irreversible dedoping process, which results in a phase separation and crystallization of the hydrated form of its protonating agent, as suggested by combining FT-IR and UV–Vis-NIR spectroscopies, optical microscopy, dc-conductivity, and frequency dependent capacitance measurements. We also introduce a simple concept to activate the sensor and to monitor it through non-contact capacitance measurements. We anticipate that the proposed concept could be implemented for functional packaging to qualitatively detect whether their contents have been exposed to humidity during their transportation and storage history.

    Original languageEnglish
    Pages (from-to)472-478
    Number of pages7
    JournalOrganic Electronics
    Issue number3
    Publication statusPublished - 2010
    MoE publication typeA1 Journal article-refereed


    • Functional dopant
    • Humidity sensor
    • Irreversible
    • Polyaniline


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