Dr. Kun-Lin Yang Profile

Dr. Kun-Lin Yang

at National Univ of Singapore

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Proceedings Article | 18 May 2009 Paper

Using liquid crystals as optical gas sensors to detect thiol vapors

Huan Xu, Kun-Lin Yang

Proceedings Volume 7356, 735611 (2009) https://doi.org/10.1117/12.819892

KEYWORDS: Liquid crystals, Copper, Ions, Glasses, Gas sensors, Nitrogen, Bioalcohols, Crystal optics, Optical gas detection, Luminescence

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We show that the optical texture of a layer of liquid crystal 4-cyano-4'-pentylbiphenyl (5CB) supported on a thiol-sensitive layer can be applied to detect 1-octanethiol and other vaporous thiols with high specificity. As demonstrated in our ellipsometry and XPS results, a thiol-sensitive layer comprising a layer of (PEI) and copper ions is capable of oxidizing thiols to disulfides and immobilizing them on the surface. Because of the hydrophobic hydrocarbon chain of 1- octanethiol, the immobilization of 1-octanethiol lowers the surface energy. Thus, after a thin layer of 5CB is supported on the surface, the lower surface energy causes 5CB to adopt different orientations in regions where copper ions were deposited. Because 5CB is a birefrigent material, different orientations of 5CB also result in distinct optical textures, which are visible to the naked eye under a pair of polarizers.

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