Exploitation of a pH-sensitive hydrogel for CO2 detection


Herber, S. and Olthuis, W. and Bergveld, P. and Berg, A. van den (2003) Exploitation of a pH-sensitive hydrogel for CO2 detection. In: Eurosensors XVII, European Conference on Solid-State Transducers, September 21-24, 2003, Guimaraes, Portugal (pp. pp. 335-336).

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Abstract:In this paper is described how hydrogel is exploited as sensor material for the
detection of carbon dioxide (CO2). A pH-sensitive hydrogel disc, 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. Bicarbonate reacts with CO2 resulting in a pH change. The enclosed hydrogel will generate pressure as a response to the pH change. This pressure is a measure for the partial pressure of CO2. The main advantage of this sensor principle is the lack of a reference electrode as required for potentiometric sensors.
Item Type:Conference or Workshop Item
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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