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Fast response hydrogel-based plasmonic sensor substrate for the detection of ethanol

Authors :
N. Steinke
Christoph Kroh
Gerald Gerlach
Thomas Härtling
Margarita Guenther
Roland Wuchrer
Source :
2019 IEEE SENSORS.
Publication Year :
2019
Publisher :
IEEE, 2019.

Abstract

The inline monitoring of ethanol concentrations in liquids is a crucial part of process monitoring in breweries and distilleries. Current methods are based on infrared spectroscopy which are bulky and costly making them non-affordable for small and middle-sized companies. To overcome these problems, we present a small, compact and cost-effective sensing method, based on a nanostructured, plasmonically active sensor substrate. The sensor substrate is coated with a microstructured ethanol-sensitive acrylamide-bisacrylamide hydrogel which induces a change of the hydrogel’s refractive index in conjugation with the hydrogel swelling and shrinking. With such an approach, the ethanol concentration in liquids can be determined in a simple optical transmittance setup. In our study, we demonstrate the capability of the sensor principle for the detection of ethanol concentration ranging from 0 to 30 vol%. Furthermore, we determined the response time of the sensor substrate to be less than 10 seconds, which shows an enormous improvement compared to other hydrogel-based sensing methods. Finally, initial results for real sample measurements are presented.

Details

Database :
OpenAIRE
Journal :
2019 IEEE SENSORS
Accession number :
edsair.doi...........34b3cf863d29383dd11f0018734a331f
Full Text :
https://doi.org/10.1109/sensors43011.2019.8956577