Exploitation of a pH-sensitive hydrogel disk for CO2 detection

Herber, S. and Olthuis, W. and Bergveld, P. and Berg van den, A. (2004) Exploitation of a pH-sensitive hydrogel disk for CO2 detection. Sensors and Actuators B: Chemical, 103 (1-2). pp. 284-289. ISSN 0925-4005

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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 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.
Item Type:	Article
Copyright:	© 2004 Elsevier
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Biomedical and Environmental Sensor systems (BIOS)
Link to this item:	http://purl.utwente.nl/publications/47853
Official URL:	http://dx.doi.org/10.1016/j.snb.2004.04.113
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