Please use this identifier to cite or link to this item: https://doi.org/10.1021/ac200589k
Title: Cholesteric liquid crystals doped with dodecylamine for detecting aldehyde vapors
Authors: Sutarlie, L. 
Lim, J.Y.
Yang, K.-L. 
Issue Date: 1-Jul-2011
Source: Sutarlie, L., Lim, J.Y., Yang, K.-L. (2011-07-01). Cholesteric liquid crystals doped with dodecylamine for detecting aldehyde vapors. Analytical Chemistry 83 (13) : 5253-5258. ScholarBank@NUS Repository. https://doi.org/10.1021/ac200589k
Abstract: In this paper, we report a study of using cholesteric liquid crystals (CLCs) doped with dodecylamine for detecting aldehyde vapors. CLCs doped with dodecylamine show color change from red to yellow-green upon exposure to 300 ppmv pentyl aldehyde within 60 s. In contrast, no colorimetric response is observed when pure CLCs are used. Characterization by using FT-IR shows that the possible mechanism responsible for the colorimetric response is the formation of an imine bond between dodecylamine and pentyl aldehyde. A new C=N peak at 1670 cm-1 appears in the spectrum after the exposure to aldehyde vapors. The CLCs doped with dodecylamine show good selectivity for pentyl aldehyde; they do not respond to 200 ppmv pentyl alcohol, pentylamine, acetone, ethanol, and water vapor. This study demonstrates the potential applications of doped CLCs as low-cost and portable gas sensors. © 2011 American Chemical Society.
Source Title: Analytical Chemistry
URI: http://scholarbank.nus.edu.sg/handle/10635/88650
ISSN: 00032700
DOI: 10.1021/ac200589k
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