Color-spectrum-broadened ductile cellulose films for vapor-pH-responsive colorimetric sensors

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We introduce a smart colorimetric sensor platform, in which iridescent chiral nematic films composed of oxidized cellulose nanocrystals (OxCNCs) exhibit pH-responsive color changes. To provide dried OxCNC films with the controlled reflection of circularly polarized lights at specific wavelengths, we manipulated the half-pitch distance from 145 to 270 nm by adjusting the surface charges of OxCNCs during 2,2,6,6-tetramethylpiperidine-1-oxyl-radical-mediated oxidation. Utilizing the controlled electrostatic repulsion generated by the difference in the surface charge of OxCNCs, the reflection wavelengths of the films could be tuned across a broad color spectrum. In addition, we improved flexibility or ductility of OxCNC composite films by coassembly with a hygroscopic polymer, polyethylene glycol, while maintaining their iridescent colors. We finally demonstrated that the OxCNC composite films could show reversible color changes in response to vapors of aqueous solutions with different pH values, thus enabling the development of a vapor-pH-responsive colorimetric sensor technology. (C) 2019 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE INC
Issue Date
2019-12
Language
English
Article Type
Article
Citation

JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, v.80, pp.590 - 596

ISSN
1226-086X
DOI
10.1016/j.jiec.2019.08.039
URI
http://hdl.handle.net/10203/270793
Appears in Collection
MS-Journal Papers(저널논문)
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