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SCIENCE CHINA Materials, Volume 63 , Issue 12 : 2582-2589(2020) https://doi.org/10.1007/s40843-020-1404-y

Stretchable electrothermochromic fibers based on hierarchical porous structures with electrically conductive dual-pathways

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  • ReceivedApr 2, 2020
  • AcceptedMay 20, 2020
  • PublishedJul 29, 2020

Abstract


Funded by

the Natural Science Foundation of China(51672043)

DHU Distinguished Young Professor Program(LZB2019002)

Young Elite Scientists Sponsorship Program by CAST(2017QNRC001)

and the Fundamental Research Funds for the Central Universities(CUSF-DH-D-2018006)


Acknowledgment

This work was supported by the National Natural Science Foundation of China (51672043), Donghua University Distinguished Young Professor Program (LZB2019002), Young Elite Scientists Sponsorship Program by China Association for Science and Technology (2017QNRC001), and the Fundamental Research Funds for the Central Universities (CUSF-DH-D-2018006).


Interest statement

The authors declare that they have no conflict of interest.


Contributions statement

Li K, Fan H, and Li Q conceived the project; Fan H and Li Q carried out the preparation and measurement of stretchable electrothermochromic fibers; Wang H, Hou C, Zhang Q and Li Y assisted the result analysis; Fan H, Li K and Wang H co-wrote the manuscript.


Author information

Hongzhi Wang joined the College of Material Science and Engineering in Donghua University as a full professor in 2005. Before that, he completed his postdoc research at the National Institute of Advanced Industrial Science and Technology (AIST), Japan. In recent years, he leads a research group at Donghua University and pursues to construct various flexible multi-functional devices, including flexible optoelectronic devices, artificial muscles and flexible energy sources/systems for smart textiles/clothing.


Supplement

Supplementary information

Supporting data are available in the online version of the paper.


References

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  • Figure 1

    Fabrication of the stretchable electrothermochromic fibers. Schematic illustration of (a) preparation process and (b) structure of the stretchable electrothermochromic fiber. (c) Cross-sectional SEM image of the stretchable electrothermochromic fiber (scale bar: 200 μm). (d) Digital photograph of the stretchable conductive fiber with a length of 3.0 m.

  • Figure 2

    Mechanical performance and morphology of porous CNT/PU composite fibers. (a) Stress-strain curves of the porous CNT/PU composite fibers with different loadings of CNTs. (b) Cross-sectional SEM image of the porous CNT/PU composite fiber (scale bar: 200 µm). (c) Enlarged SEM image of the porous CNT/PU composite fiber (scale bar: 5 µm).

  • Figure 3

    Tensile stability and conductive mechanism of the stretchable conductive fibers. (a) SEM image of the stretchable conductive fiber (scale bar: 3 µm). (b) Schematic diagram of conductive dual-pathways of the stretchable conductive fibers under stretching/releasing states. (c) Resistive ratio (ΔR/R0) variations as a function of tensile strains of the stretchable conductive fibers fabricated with different preparation conditions. (d) Cycling stability of the stretchable conductive fiber during repeated stretching/releasing process with the maximum strain of 60%.

  • Figure 4

    Color-changing performances of the stretchable electrothermochromic fibers under different strains. (a) Temperature-time curves,(b) digital photographs, (c) corresponding thermal images and (d) reflectance spectra of the stretchable electrothermochromic fibers at different stains. (e) Cyclic stability of the stretchable electrothermochromic fibers during repeated stretching/releasing processes under maximum stains of 30% and 60%, respectively.

  • Figure 5

    Color-changing performances of the stretchable electrothermochromic fibers under different applied voltages. (a) Temperature changes of the stretchable electrothermochromic fibers under different voltages. (b) In-situ reflectance response of the stretchable electrothermochromic fiber under switched voltages between 0 and 7 V at wavelength of 524 nm. (c) ΔRT of stretchable electrothermochromic fiber at wavelength of 524 nm during 1000 color-changing cycles. (d) Digital photographs of the stretchable electrothermochromic fiber with pattern of “clover” implanted into textile (scale bar: 3 mm).

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