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Electromagnetic Interference Shielding Performance of CNT Sponge/PDMS Force-Sensitive Composites

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Abstract

In order to obtain a force-sensitive composite structure with high-performance electromagnetic interference (EMI) shielding, this paper proposes a method for preparing flexible force-sensitive composites by backfilling PDMS into a carbon nanotube (CNT) sponge using a vacuum-assisted method. Compared with CNTs/PDMS force-sensitive composites with different content prepared by the traditional solution blending method, the CNT sponge/PDMS force-sensitive composite prepared by the vacuum-impregnation method demonstrated sensitivity of 70 in a strain range of 35–50% at a thickness of 1 mm with a low filler content of 1 wt.%, and also showed excellent cyclic stability. The EMI shielding effectiveness (SE) reached 34.56 dB in the X band, and it still maintained high EMI SE (33.68 dB) after 500 repeated stretching cycles, which would be sufficient for commercial applications. The prepared CNT sponge/PDMS force-sensitive composite not only meets the basic sensitivity at low content (only 1 wt.%) but also has high EMI SE (34.56 dB) due to its high electrical conductivity (53 S/m), which makes it have potential applications in flexible stress sensors.

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Data Availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China, Grant No. 51775522, Shanxi Province Key Laboratory of Quantum Sensing and Precision Measurement, Grant No. 201905D121001, Shanxi ‘1331 Project’ Key Subjects Construction, Applied Basic Research Program in Shanxi Province, Grant Nos. 201901D211203, 201801D221230.

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Authors and Affiliations

  1. Key Laboratory of Instrumentation Science and Dynamic Measurement, Shanxi Province Key Laboratory of Quantum Sensing and Precision Measurement, School of Instrument and Electronics, North University of China, Taiyuan, 030051, China

    Lishuang Liu, Jinping Liu, Ruirong Wang, Xin Li, Hao Guo, Jun Tang & Jun Liu

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  1. Lishuang Liu
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  2. Jinping Liu
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  3. Ruirong Wang
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  4. Xin Li
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  6. Jun Tang
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  7. Jun Liu
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Correspondence to Lishuang Liu.

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Liu, L., Liu, J., Wang, R. et al. Electromagnetic Interference Shielding Performance of CNT Sponge/PDMS Force-Sensitive Composites. J. Electron. Mater. 52, 429–436 (2023). https://doi.org/10.1007/s11664-022-10008-y

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