Printable optical sensors based on H-bonded supramolecular cholesteric liquid crystal networks

N. Herzer, H Guneysu, D.J.D. Davies, D. Yildirim, A.R. Vaccaro, D.J. Broer, C.W.M. Bastiaansen, A.P.H.J. Schenning

Research output: Contribution to journalArticleAcademicpeer-review

129 Citations (Scopus)
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A printable H-bonded cholesteric liquid crystal (CLC) polymer film has been fabricated that, after conversion to a hygroscopic polymer salt film, responds to temperature and humidity by changing its reflection color. Fast-responding humidity sensors have been made in which the reflection color changes between green and yellow depending on the relative humidity. The change in reflection band is a result of a change in helix pitch in the film due to absorption and desorption of water, resulting in swelling/deswelling of the film material. When the polymer salt was saturated with water, a red-reflecting film was obtained that can potentially act as a time/temperature integrator. Finally, the films were printed on a foil, showing the potential application of supramolecular CLC materials as low-cost, printable, battery-free optical sensors.
Original languageEnglish
Pages (from-to)7608-7611
Number of pages4
JournalJournal of the American Chemical Society
Issue number18
Publication statusPublished - 2012


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