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Herzer N, Guneysu H, Davies DJ, et al. Printable optical sensors based on H-bonded supramolecular cholesteric liquid crystal networks. J Am Chem Soc. 2012;134(18):7608-11doi: 10.1021/ja301845n.
Herzer, N., Guneysu, H., Davies, D. J., Yildirim, D., Vaccaro, A. R., Broer, D. J., Bastiaansen, C. W., & Schenning, A. P. (2012). Printable optical sensors based on H-bonded supramolecular cholesteric liquid crystal networks. Journal of the American Chemical Society, 134(18), 7608-11. https://doi.org/10.1021/ja301845n
Herzer, Nicole, et al. "Printable optical sensors based on H-bonded supramolecular cholesteric liquid crystal networks." Journal of the American Chemical Society vol. 134,18 (2012): 7608-11. doi: https://doi.org/10.1021/ja301845n
Herzer N, Guneysu H, Davies DJ, Yildirim D, Vaccaro AR, Broer DJ, Bastiaansen CW, Schenning AP. Printable optical sensors based on H-bonded supramolecular cholesteric liquid crystal networks. J Am Chem Soc. 2012 May 09;134(18):7608-11. doi: 10.1021/ja301845n. Epub 2012 Apr 27. PMID: 22519954.
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J Am Chem Soc. 2012 May 09;134(18):7608-11. doi: 10.1021/ja301845n. Epub 2012 Apr 27.

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

Journal of the American Chemical Society

Nicole Herzer, Hilal Guneysu, Dylan J D Davies, Derya Yildirim, Antonio R Vaccaro, Dirk J Broer, Cees W M Bastiaansen, Albertus P H J Schenning

Affiliations

  1. Functional Organic Materials & Devices, Eindhoven University of Technology, PO Box 513, Eindhoven, The Netherlands.

PMID: 22519954 DOI: 10.1021/ja301845n

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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