Exploitation of a pH-sensitive hydrogel disk for CO2 detection

S. Herber, Wouter Olthuis, Piet Bergveld, Albert van den Berg

    Research output: Contribution to journalArticleAcademicpeer-review

    41 Citations (Scopus)


    In this paper is described how hydrogel is exploited as sensor material for the detection of carbon dioxide (CO2). A pH-sensitive hydrogel disk, which swells and deswells in response to pH changes, was clamped between a pressure sensor membrane and a porous metal screen together with a bicarbonate solution. CO2 reacts with the bicarbonate solution resulting in a pH change, which is converted into a pressure by the enclosed hydrogel. This pressure is a measure for the partial pressure of CO2. The main advantage of this sensor principle is the fact that a reference electrode as required for potentiometric sensors is no longer needed.
    Original languageUndefined
    Pages (from-to)284-289
    Number of pages6
    JournalSensors and actuators. B: Chemical
    Issue number1-2
    Publication statusPublished - 2004


    • IR-47853
    • METIS-218790

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