Hydrogel-based sensor for CO2 measurements

Herber, S. and Olthuis, W. and Bergveld, P. and Berg van den, A. (2004) Hydrogel-based sensor for CO2 measurements. In: Eurosensors XVIII, European Conference on Solid-State Transducers, 13-15 Sep 2004, Rome, Italy.

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Abstract:	A hydrogel-based sensor is presented for CO2 measurements. The sensor consists of a pressure sensor and porous silicon cover. A pH-sensitive hydrogel is confined between the two parts. Furthermore the porous cover contains a bicarbonate solution and a gaspermeable membrane. CO2 reacts with the solution resulting in a pH change. The hydrogel responds to this by generating a certain pressure which is measured by the pressure sensor. Experiments show that the sensor responds to CO2 steps within reasonable time and with good signal response. Especially due to the lack of any reference electrode this sensor principle proofs to have great potentials.
Item Type:	Conference or Workshop Item
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/48294
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