Polyaniline nanoparticle-based solid-contact silicone rubber ion-selective electrodes for ultratrace measurements

Tom Lindfors, Júlia Szücs, Fredrik Sundfors, Róbert E. Gyurcsányi

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    Abstract

    Silicone rubber (SR)-based solid-contact ion-selective electrodes (ISEs) have been prepared for the first time with an electrically conducting polymer as the solid-contact (SC) layer. The Ca(2+)- and Ag(+)-selective electrodes were based on the ionophores ETH 1001 and o-xylylenebis(N,N-diisobutyl dithiocarbamate), respectively, integrated in room temperature vulcanizing silicone rubber (RTV 3140). The SC consisted of a polyaniline nanoparticle dispersion, which was found to considerably lower the impedance of the SCISEs in comparison to the SR-based coated wire electrodes (CWE). For the CaSCISEs, the bulk membrane resistance decreased from 700 M Omega (CaCWE) to 35 M Omega. Both the Ca(2+) and Ag(+)-selective SCISEs exhibited nanomolar detection limits with fast Nernstian responses down to 10(-8) M. The potential response of the SCISEs was not influenced by light. The selectivities of the CaSCISEs were similar and for the AgSCISE better than their plasticized PVC-based analogues. Thus, SR seems to be a viable alternative to PVC membranes in ISE applications that require low water uptake, good adhesion, and robust and fast potential responses at submicromolar sample concentrations.
    Original languageUndefined/Unknown
    Pages (from-to)9425–9432
    Number of pages8
    JournalAnalytical Chemistry
    Volume82
    Issue number22
    DOIs
    Publication statusPublished - 2010
    MoE publication typeA1 Journal article-refereed

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