期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 45, 页码 50844-50851出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c14749
关键词
smart fiber; structural color; thermochromic; temperature sensor; fibrous actuator
资金
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University [KF2014]
- Fundamental Research Funds for the Central Universities [17D310601]
- China Scholarship Council
- American Chemical Society (ACS) Petroleum Research Fund (American Chemical Society (ACS) Petroleum Research Fund (PRF) [573238]
Fibers that can reversibly and passively change colors along with body temperatures are highly desired for potential applications including temperature sensors, smart wearables, and photonic devices. Here, we develop a facile strategy to fabricate thermochromic photonic fibers, which could exhibit tunable structural colors as a function of temperatures. The thermochromic fibers are prepared by aligning superparamagnetic, carbon-encapsulated Fe3O4 colloidal nanocrystal clusters (Fe3O4@C CNCs) in a thermoresponsive hydrogel, poly(N-isopropylacrylamide) (PNIPAM), forming chain-like structures under an external magnetic field before gelation. When the fiber is transferred from air to water at room temperature, it changes color from dark green to red as it swells. The red color can be reversibly changed back to green as the temperature is raised to 36 degrees C, while the fiber shrinks and the reflection peak shifts from 642 to 494 nm. The swelling of the fiber is anisotropic: by 60% in the diameter direction but 45% in the length direction. Therefore, the fiber can act as a thermochromic actuator.
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