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J. Sens. Sens. Syst., 7, 219-226, 2018
https://doi.org/10.5194/jsss-7-219-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Regular research article
04 Apr 2018
Hydrogel-based piezoresistive sensor for the detection of ethanol
Jan Erfkamp, Margarita Guenther, and Gerald Gerlach Solid-State Electronics Laboratory, Technische Universität Dresden, Dresden, Germany
Abstract. This article describes a low-cost sensor for the detection of ethanol in alcoholic beverages, which combines alcohol-sensitive hydrogels based on acrylamide and bisacrylamide and piezoresistive sensors. For reproducible measurements, the reversible swelling and deswelling of the hydrogel were shown via microscopy. The response time of the sensor depends on the swelling kinetics of the hydrogel. The selectivity of the hydrogel was tested in different alcohols. In order to understand the influence of monomer and crosslinker content on the swelling degree and on the sensitivity of the hydrogels, gels with variable concentrations of acrylamide and bisacrylamide were synthesized and characterized in different aqueous solutions with alcohol contents. The first measurements of such hydrogel-based piezoresistive ethanol sensors demonstrated a high sensitivity and a short response time over several measuring cycles.
Citation: Erfkamp, J., Guenther, M., and Gerlach, G.: Hydrogel-based piezoresistive sensor for the detection of ethanol, J. Sens. Sens. Syst., 7, 219-226, https://doi.org/10.5194/jsss-7-219-2018, 2018.

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Short summary
We describe a low-cost sensor for the detection of ethanol in alcoholic beverages. The reversible swelling of alcohol-sensitive hydrogels depends on the ethanol concentration. The resulting swelling pressure was detected via piezoresistive sensors. We have tested the swelling properties of the hydrogel (e.g. swelling kinetics, selectivity to other alcohols). Furthermore, the first sensor set-ups were tested and the reversibility of the hydrogel-based piezoresistive sensor was demonstrated.
We describe a low-cost sensor for the detection of ethanol in alcoholic beverages. The...
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