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In relation to this article, we declare that there is no conflict of interest.
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Received August 18, 2021
Accepted January 9, 2022
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Hydrophobic films for optical detection of dry carbon dioxide based on ion pairing and an amine polymer

IOMTEK, 639-ho, Changeup Ground, 87, Cheongam-ro, Nam-gu, Pohang-si, Gyeongsangbuk-do 37673, Korea 1Korea Institute of Industrial Technology, 89 Yangdaegiro-gil, Ipjang-myeon, Seobuk-gu, Cheonan-si, Chungcheongnam-do 31056, Korea
ks_hwang@kitech.re.kr
Korean Journal of Chemical Engineering, June 2022, 39(6), 1597-1603(7), 10.1007/s11814-022-1063-x
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Abstract

Existing optical carbon dioxide sensors using ion pair materials with pH indicators need moisture to function. To sense dry carbon dioxide gas, hydrophobic films were prepared using an amine polymer (branched-polyethyleneimine) instead of water, along with an ion pair dye and an aromatic polymer. The color of the ion pair formed between cresol red sodium salt and tetra-n-octylammonium bromide was yellow when the pH was below neutral. After adding branched polyethyleneimine, the color changed to violet as the pH became basic. On exposure to carbon dioxide, the amine groups on the branched-polyethyleneimine were converted to alkyl carbamate anions and ammonium cations via reaction with the carbon dioxide. When the ion pair reacted with the resulting ammonium cations, the film changed color from violet to yellow. It was determined that the degree of color change was dependent on the carbon dioxide exposure times and the amount of branched-polyethyleneimine added to the film.

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