Journal
CARBOHYDRATE POLYMERS
Volume 240, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.116281
Keywords
Cellulose nanocrystal; Chiral nematic structure; Polyol; Environmental humidity
Categories
Funding
- National Natural Science Foundation of China [31270633]
- Natural Foundation of Shandong Province [ZR2017MC007]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX18_1825, KF201905]
- Foundation of State Key Laboratory of Biobased Material and Green Papermaking
- Qilu University of Technology
- Shandong Academy of Sciences
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Herein, we fabricated flexible and humidity-sensitive composite films employing cellulose nanocrystal (CNC) and polyols, i.e., glycerol (G), xylitol (X) and sorbitol (S). The effects of polyols with different molecular weights on the structure, optical properties, mechanical strength and humidity response of the composite films were investigated. Notably, the CNC-S film exhibited obvious reversible colour changes from light green to red upon a relative humidity (RH) change from 30 % to 95 %. Moreover, it was found that the composite films had a large colour-change range, good reversibility (> 10 cycles), and excellent stability (> 10 weeks). Overall, the results demonstrated that the CNC-S composite film can be used as a functional material for the preparation of flexible humidity sensors for the detection of environmental humidity changes in agriculture, industry, and other fields.
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