Abstract
Humidity sensors have become an essential need for improving daily life quality. Here, a novel humidity sensitive fiber was fabricated using the soft polydimethylsiloxane (PDMS) as the core layer and the non-swellable polyvinylidenedifluoride (PVDF) embedded with a swellable MIL-88A as the outer layer. Noticeably, the PDMS fiber was chosen as a carrier due to its smoothness, softness and good tensile properties. The isoreticular FeIII dicarboxylate MIL-88 family with swellable metal–organic frameworks (MOFs) can undergo reversible dynamic structural transformations with a response to external humidity change. The resulted fiber with swellable MOFs showed three kinds of deformation for a single solvent and also had good deformation performance for two-component miscible solution with different volume ratios. As a proof of concept, a shape-memory effect at relative humidity from 10 to 90% and the simulated salt solutions instead of relative humidity changes were used to evaluate humidity change. In addition, a deep insight into the self-shape-change mechanism among those phenomena was investigated, wherein expansion deformation of the PDMS fiber as well as the structural transformation of the MIL-88A worked in different conditions.
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Acknowledgements
We gratefully acknowledge financial support from Zhejiang Top Priority Discipline of Textile Science and Engineering, Natural Science Foundation of Zhejiang Province (No. LY13B030009), Science Foundation of Zhejiang Sci-Tech University (ZSTU) (No. 1101820-Y).
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Lv, S., Shuai, L., Ding, W. et al. Flexible Humidity Sensitive Fiber with Swellable Metal–Organic Frameworks. Adv. Fiber Mater. 3, 107–116 (2021). https://doi.org/10.1007/s42765-021-00064-0
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DOI: https://doi.org/10.1007/s42765-021-00064-0