Dresden 2026 – scientific programme
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DS: Fachverband Dünne Schichten
DS 20: Poster
DS 20.3: Poster
Thursday, March 12, 2026, 18:30–20:30, P2
Investigation of a hygrosensitive polymer coating for colorimetric humidity sensing — •Ketrin Pavlova1, Katerina Lazarova1, Darinka Christova2, Martina Docheva1, and Tsvetanka Babeva1 — 1Institute of Optical Materials and Technologies "Acad. J. Malinowski" Bulgarian Academy of Sciences, Sofia, Bulgaria — 2Institute of Polymers, Bulgarian Academy of Sciences, Sofia, Bulgaria
A thin coatings of newly synthesized branched copolymers of poly(vinyl alcohol) comprising graft poly(N,N-dimethylacrylamide) with different side chains were studied as sensitive media for environmental changes of the relative humidity (RH). Spin-coating method was applied to deposit the thin films of both copolymers on Si-substrates, followed by temperature heating. Reflectance spectra of the samples were measured and then used to determine coating`s thickness and optical constants. Sensing abilities of the coatings when exposed to different humidity level in range 5-95 RH% were examined and parameters such as hysteresis H and thickness change Δd were calculated. Possible application of the coatings for colorimetric detection is demonstrated.
Keywords: polymers; optical sensing; thin films; humidity