Articles | Volume 7, issue 1
https://doi.org/10.5194/jsss-7-51-2018
https://doi.org/10.5194/jsss-7-51-2018
Regular research article
 | 
06 Feb 2018
Regular research article |  | 06 Feb 2018

Evaluation of the pH-sensitive swelling of a hydrogel by means of a plasmonic sensor substrate

Christoph Kroh, Roland Wuchrer, Margarita Günther, Thomas Härtling, and Gerald Gerlach

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Cited articles

Gerlach, G., Guenther, M., Suchaneck, G., Sorber, J., Arndt, K.-F., and Richter, A.: Application of sensitive hydrogels in chemical and pH sensors, Macromol. Symp., 210, 403–410, https://doi.org/10.1002/masy.200450645, 2004. 
Guenther, M., Gerlach, G., Wallmersperger, T., Avula, M. N., Cho, S. H., Xie, X., Devener, B. V., Solzbacher, F., Tathireddy, P., Magda, J. J., Scholz, C., Obeid, R., and Armstrong, T.: Smart Hydrogel-Based Biochemical Microsensor Array for Medical Diagnostics, Adv. Sci. Tech., 85, 47–52, https://doi.org/10.4028/www.scientific.net/AST.85.47, 2013. 
Guenther, M., Wallmersperger, T., and Gerlach, G.: Piezoresistive Chemical Sensors Based on Functionalized Hydrogels, Chemosensors, 2, 145–170, https://doi.org/10.3390/chemosensors2020145, 2014. 
Jiang, H., Markowski, J., and Sabarinathan, J.: Near-infrared optical response of thin film pH sensitive hydrogel coated on a gold nanocrescent array, Opt. Express, 17, 21802-7, https://doi.org/10.1364/OE.17.021802, 2009. 
Kreibig, U. and Vollmer, M.: Optical Properties of Metal Clusters, Springer Series in Material Science, Springer-Verlag Berlin Heidelberg, https://doi.org/10.1007/978-3-662-09109-8, 1995. 
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Short summary
The inline monitoring of parameters in aqueous liquids is facing an increasing demand in many application areas. In this paper we report on an optical monitoring of the pH value in liquids by means of a sensitive hydrogel, which can be applied in the physiological range. Our results indicate a nearly linear dependency between pH value and hydrogel swelling. Furthermore, we show an improvement of the response time by a factor of 2 in comparison to other systems exploiting this kind of hydrogel.