Comparison of multi-walled carbon nanotubes and poly(3-octylthiophene) as ion-to-electron transducers in all-solid-state potassium ion-selective electrodes

Zekra Mousavi, Agnieszka Teter, Andrzej Lewenstam, Magdalena Maj-Zurawska, Ari Ivaska, Johan Bobacka

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    Multi-walled carbon nanotubes (MWCNTs) were compared with poly(3-octylthiophene) (POT) as ion-to-electron transducer in all-solid-state potassium ion-selective electrodes with valinomycin-based ion-selective membranes. MWCNTs and POT were mixed with the other components of the potassium ion-selective membrane cocktail (valinomycin, KTpClPB, o-NPOE, PVC, THF) which was then applied on a glassy carbon (GC) substrate to prepare single-piece ion-selective electrodes (SPISEs). Results from potentiometric and impedance measurements showed that the MWCNT-based electrodes have a more reproducuible standard potential and a lower overall impedance than the electrodes based on POT. Both types of electrodes showed similar sensitivity to potassium ions and no redox sensitivity.
    Original languageUndefined/Unknown
    Pages (from-to)1352–1358
    Number of pages7
    Issue number6
    Publication statusPublished - 2011
    MoE publication typeA1 Journal article-refereed


    • All-solid-state potassium-selective electrodes
    • Impedance spectroscopy
    • Multi-walled carbon nanotubes
    • Poly(3-octylthiophene)
    • Potentiometry

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