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

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

Content Provider	Semantic Scholar
Author	Kroh, Christoph Wuchrer, Roland Guenther, Margarita Härtling, Thomas Gerlach, Gerald
Copyright Year	2018
Abstract	Abstract. The inline monitoring of parameters in aqueous liquids is facing an increasing demand in many different application areas. Hydrogels with pH-induced swelling and deswelling behavior offer a means to measure pH in such liquids. Here we investigate the optical interrogation of a pH-sensitive hydrogel which can be applied in the physiological pH range. For this, a nanostructured gold substrate supporting surface plasmon oscillations is coated with a HPMA/DMAEMA/TEGDMA/EG hydrogel. The gel swells in the pH range under investigation (here 4.5 to 6.5), and the resulting refractive index changes subsequently lead to a spectral shift of the plasmon resonance of the gold nanostructure. The spectral resonance position is determined from optical transmittance spectra of the sensor substrates, and the initial results for our hydrogel reported here indicate a nearly linear dependence between the swelling state and the plasmon resonance wavelength.
Starting Page	51
Ending Page	55
Page Count	5
File Format	PDF HTM / HTML
DOI	10.5194/jsss-7-51-2018
Volume Number	7
Alternate Webpage(s)	https://www.j-sens-sens-syst.net/7/51/2018/jsss-7-51-2018.pdf
Alternate Webpage(s)	https://doi.org/10.5194/jsss-7-51-2018
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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