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Sensors 2016, 16(1), 38; doi:10.3390/s16010038

Tilted Orientation of Photochromic Dyes with Guest-Host Effect of Liquid Crystalline Polymer Matrix for Electrical UV Sensing

1
School of Electronics Engineering, Kyungpook National University, Daegu 702-701, Korea
2
Department of Sensor and Display Engineering, Kyungpook National University, Daegu 702-701, Korea
3
Department of Textile System Engineering, Kyungpook National University, Daegu 702-701, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 25 November 2015 / Revised: 17 December 2015 / Accepted: 25 December 2015 / Published: 29 December 2015
(This article belongs to the Collection Sensors for Globalized Healthy Living and Wellbeing)
View Full-Text   |   Download PDF [3872 KB, uploaded 29 December 2015]   |  

Abstract

We propose a highly oriented photochromic dye film for an ultraviolet (UV)-sensing layer, where spirooxazine (SO) derivatives are aligned with the liquid crystalline UV-curable reactive mesogens (RM) using a guest-host effect. For effective electrical UV sensing with a simple metal-insulator-metal structure, our results show that the UV-induced switchable dipole moment amount of the SO derivatives is high; however, their tilting orientation should be controlled. Compared to the dielectric layer with the nearly planar SO dye orientation, the photochromic dielectric layer with the moderately tilted dye orientation shows more than seven times higher the UV-induced capacitance variation. View Full-Text
Keywords: UV-sensing; spirooxazine (SO); photochromic dye; liquid crystal; metal-insulator-metal (MIM) structure; guest-host effect UV-sensing; spirooxazine (SO); photochromic dye; liquid crystal; metal-insulator-metal (MIM) structure; guest-host effect
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ranjkesh, A.; Park, M.-K.; Park, D.H.; Park, J.-S.; Choi, J.-C.; Kim, S.-H.; Kim, H.-R. Tilted Orientation of Photochromic Dyes with Guest-Host Effect of Liquid Crystalline Polymer Matrix for Electrical UV Sensing. Sensors 2016, 16, 38.

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