期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 21, 页码 18231-18237出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b04590
关键词
cellulose nanocrystals; chiral nematic liquid crystals; humidity response; sensor; bioinspired; photonic materials
资金
- National Key R&D Program of China [2016YFA0202900]
- National Science Foundation of China [51672173]
- Shanghai Science and Technology Committee [16520710900, 14JC1403300, 14DZ2261204, 14520710100]
- Science and Technology Planning Project of Guangdong Province [2016A010103018]
Cellulose nanocrystals (CNCs) have attracted much interest due to their unique optical property, rich resource, environment friendliness, and templating potentials. CNCs have been reported as novel photonic humidity sensors, which are unfortunately limited by the dissolution and unideal moisture absorption of CNCs. We, in this study, developed a high-performance; photonic humidity composite sensor that consisted of CNCs and polyacrylamide; thenlidai bonding was induced between the two components by using glutaraldehyde as a bridging agent. The composites inherited the chiral nematic structure of CNCs and maintained it well through a cycling test. A distinct color change was observed for these composites used as a humidity indicator; the change was caused by polyacrylamide swelling with water and thus enlarging the helical pitch of the chiral nematic structure. The composites showed no degradation of the sensing performance through cycling. The excellent cycling stability was attributed to the bonding between polyacrylamide and CNCs. This composite strategy can extend to the development of other photonic indicators.
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