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Conductivity and optical bandgap parameters variations of methyl red-doped 4-pentyl-4′-cyanobiphenyl nematic liquid crystal: norland optical adhesive 65 photopolymer composites

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Abstract

In this study, the effect of methyl red (MR) concentration variation on conductivity and optical bandgap parameters of 4-pentyl-4′-cyanobiphenyl (5CB) nematic liquid crystal and norland optical adhesive 65 (NOA65) photopolymer (5CB:NOA65) composite was investigated. As a result of the experimental studies, wavelength-dependent absorbance, frequency-dependent dielectric constants (ε′ and ε″), and alternating current (ac) conductivity (σac) graphs of the samples were obtained. Also, dielectric anisotropy (Δε′), direct current (dc) conductivity (σdc), and optical bandgap (Eg) parameters were determined. It was observed that ε′, ε″, and σac increased with increasing MR concentration at low frequency region. On the other hand, it was concluded that Δε′ and Eg decreased with increasing MR concentration. It has been seen that the results are compatible with each other and it is thought that composites may be useful for liquid crystal-based devices.

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  1. Department of Physics, Faculty of Arts & Sciences, Düzce University, 81620, Düzce, Turkey

    Gülsüm Kocakülah & Oğuz Köysal

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GK and OK performed all the experimental work, collected and analyzed the data, wrote the first draft of the manuscript and approved the final version of the manuscript.

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Kocakülah, G., Köysal, O. Conductivity and optical bandgap parameters variations of methyl red-doped 4-pentyl-4′-cyanobiphenyl nematic liquid crystal: norland optical adhesive 65 photopolymer composites. J Mater Sci: Mater Electron 34, 1498 (2023). https://doi.org/10.1007/s10854-023-10857-1

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