Smart Hydrogel Gratings for Sensitive, Facile, and Rapid Detection of Ethanol Concentration

A simple grating system based on poly­(N-isopropylacrylamide-co-acrylamide) (poly­(NIPAM-co-AAm)) hydrogel for sensitive and rapid detection of ethanol concentration is developed. The hydrogel gratings enable ethanol-induced shrinking, thus changing their refractive index and height. The changes in...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2019-09, Vol.58 (38), p.17833-17841
Main Authors: Peng, Han-Yu, Wang, Wei, Gao, Fu-Hua, Lin, Shuo, Ju, Xiao-Jie, Xie, Rui, Liu, Zhuang, Faraj, Yousef, Chu, Liang-Yin
Format: Article
Language:English
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Summary:A simple grating system based on poly­(N-isopropylacrylamide-co-acrylamide) (poly­(NIPAM-co-AAm)) hydrogel for sensitive and rapid detection of ethanol concentration is developed. The hydrogel gratings enable ethanol-induced shrinking, thus changing their refractive index and height. The changes in the optical property and structure of hydrogel gratings allow efficient conversion and amplification of signals of ethanol concentration into changes in the diffraction efficiency for facile detection of ethanol concentration via a simple optical detection system. By adjusting the molar ratios of NIPAM and AAm in the hydrogel gratings, significant diffraction efficiency changes in response to ethanol concentrations in the range of 0–30 vol % at different temperatures can be achieved for sensitive ethanol detection. Moreover, the hydrogel gratings with nanometer-sized height and uniform surface relief structures allow rapid response time (less than 2 min) and good repeatability for ethanol detection.
ISSN:0888-5885
1520-5045
DOI:10.1021/acs.iecr.9b03395