Printable optical sensors based on H-bonded supramolecular cholesteric liquid crystal networks |
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Authors: | Herzer Nicole Guneysu Hilal Davies Dylan J D Yildirim Derya Vaccaro Antonio R Broer Dirk J Bastiaansen Cees W M Schenning Albertus P H J |
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Institution: | Functional Organic Materials & Devices, Eindhoven University of Technology, PO Box 513, Eindhoven, The Netherlands. |
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Abstract: | 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. |
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