期刊
COMPOSITES PART B-ENGINEERING
卷 215, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.108752
关键词
Electromagnetic interference shielding; Fabric structure; Fractal dimension; Environmental stability; Wearable textile antennas
资金
- Hubei provincial department of Education [D20201701]
- National Natural Science Foundation of China [U20A20257, 51873166, 51873165]
- Major Technology Innovation of Hubei Province [2019AAA035]
- Program of Hubei Technology Innovation-International Collaboration [2017AHB065]
- Hubei Province Central Government Guides Local Science and Technology Development Projects [2018ZYYD057]
- Key Research and Development Program of Shandong Province of China [2019JZZY010338]
- Applied Fundamental Research Program of Wuhan Municipal Science and Technology Bureau [2017060201010165]
- Wuhan Engineering Technology Research Center for Advanced Fibers
This study demonstrates the high EMI shielding effectiveness of flexible Ni/PPy/PET fabrics. The research reveals a close relationship between the fractal dimension of fabrics and their EMI shielding effectiveness, suggesting that fabrics with higher fractal dimensions as base materials provide better EMI shielding effects.
Lightweight and flexible multifunctional conductive fabrics with excellent environmental stability are highly demanded for electromagnetic interference (EMI) shielding and e-textiles related applications. The relationship between the fabric structure and the EM properties of conductive fabrics has aroused extensive research interest, but it is still full of challenges. Herein, warp knitted polyethylene terephthalate (WK-PET) fabric and non-woven PET (NW-PET) fabric with irregular pore structure and similar thickness are selected as substrates. Flexible Ni/ PPy/PET fabrics with high EMI shielding effectiveness have been facilely fabricated by in-situ polymerization of pyrrole (Py) and subsequent electroless plating of nickel. The conductivity, EMI shielding effectiveness and the normalized effectiveness of the Ni/PPy/NW-PET fabric is 96.32 S/cm, 77.87 dB, 1600.19 dB cm2/g, respectively, which are better than those of the Ni/PPy/WK-PET (91.71 S/cm, 62.6 dB, 1037.11 dB cm2/g). A simplified fabric structure model and fractal dimension of the fabrics have been proposed in this study to reveal the relationship between the fabric structure and the EMI shielding effectiveness. It implies that the fractal dimension of a conductive fabric is highly related to its absorption EMI shielding effectiveness. It also suggests a fabric with a higher fractal dimension as a base material can provide more connected conductive networks and better EMI shielding effects for the resulting conductive fabric. Moreover, the Ni/PPy/NW-PET fabric demonstrates outstanding heat-humid stability, high bending stability and washability, as well as great potential in wearable fabric antennas. In short, this work may provide a novel idea for the development of high-performance conductive fabrics.
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