Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 50, Pages 18484-18491Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c06174
Keywords
cellulose nanocrystal; chiral nematic; flexibility; colorimetric sensing
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Funding
- National Natural Science Foundation of China [51773133]
- Science and Technology Fund for Distinguish Young Scholars of Sichuan Province [2019JDJQ0025]
- State Key Laboratory of Polymer Materials Engineering [sklpme2020-3-09]
- Fundamental Research Funds for the Central Universities
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Biomimetic optical cellulose nanocrystal (CNC) materials have shown great potential for application in colorimetric sensing, anticounterfeiting, and decorative coatings because of simple recognition by the naked eye; however, how to simultaneously solve the inherent brittleness of CNCs as well as achieve multisensing functions is still a big challenge. Here, we propose a new coassembly strategy of CNCs and citric acid (CA) to fabricate freestanding photonic CNC films. The chiral nematic structure and visible structural colors can be adjusted in a wide color range by varying the CA content. Owing to the plasticizing effect, the resulting CNC-CA films display high flexibility and can be folded freely. Notably, such films can sense different external signals, including compression, ethanol and alkali, by changing apparent structural colors. Additionally, for volatile chemicals, the color changes are reversible, ensuring repeating applications. Given the high mechanical performance and multisensing performance, this method represents a simple but effective way to construct highly flexible and multifunctional photonic CNC materials.
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