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    High-Temperature Potentiometry: Modulated Response of Ion-Selective Electrodes During HeatPulses

    Access Status
    Fulltext not available
    Authors
    Chumbimuni-Torres, K.
    Thammakhet, C.
    Galik, M.
    Calvo-Marzal, P.
    Wu, J.
    Bakker, Eric
    Flechsig, G.
    Wang, J.
    Date
    2009
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Chumbimuni-Torres, Karin Y. and Thammakhet, Chongdee and Galik, Michal and Calvo-Marzal, Percy and Wu, Jie and Bakker, Eric and Flechsig, Gerd-Uwe and Wang, Joseph. 2009. High-Temperature Potentiometry: Modulated Response of Ion-Selective Electrodes During HeatPulses. Analytical Chemistry 81: pp. 10290-10294.
    Source Title
    Analytical Chemistry
    DOI
    10.1021/ac902191h
    ISSN
    00032700
    Faculty
    Nanochemistry Research Institute (NRI)
    Faculty of Science and Engineering
    School
    Nanochemistry Research Institute (Research Institute)
    URI
    http://hdl.handle.net/20.500.11937/13660
    Collection
    • Curtin Research Publications
    Abstract

    The concept of locally heated polymeric membrane potentiometric sensors is introduced here for the first time. This is accomplished in an all solid state sensor configuration, utilizing poly(3-octylthiophene) as the intermediate layer between the ion-selective membrane and underlying substrate that integrates the heating circuitry. Temperature pulse potentiometry (TPP) gives convenient peak-shaped analytical signals and affords an additional dimension with these sensors. Numerous advances are envisioned that will benefit the field. The heating step is shown to give an increase in the slope of the copperselective electrode from 31 to 43 mV per 10-fold activity change, with a reproducibility of the heated potential pulses of 1% at 10 M copper levels and a potential drift of 0.2 mV/h. Importantly, the magnitude of the potential pulse upon heating the electrode changes as a function of the copper activity, suggesting an attractive way for differential measurement of these devices. The heat pulse is also shown to decrease the detection limit by half an order of magnitude.

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