Liquid metal electromagnetic wave shielding and absorbing film for solving electromagnetic interference in flexible sensors

IF 6.8 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Science China Materials Pub Date : 2024-10-10 DOI:10.1007/s40843-024-3111-2

Xilong Zhang (, ), Zhongshan Deng (, ), Huize Song (, ), Minghui Guo (, ), Lei Li (, )

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Abstract

The presence of electromagnetic interference (EMI) leads to distortion of current and voltage waveforms, which reduces the accuracy and stability of sensor devices. The emergence of flexible electronic devices has broken the limits of physical space, as they can be bent and twisted at will. However, this characteristic exacerbates unwanted coupling of their internal sensing elements, which can interfere with each other. At present, the solution to EMI is based on electromagnetic shielding (EMS), but this method alone cannot solve internal EMI of flexible sensor devices. In this study, the gallium-based liquid metal (LM) circuits are printed on the Ecoflex@Fe film to realize a stretchable film with both EMS and wave-absorbing functions, which is expected to simultaneously address the effects of internal and external EMI. The results show that the shielding efficiency of the electromagnetic wave shielding and absorbing (EWSA) film is as high as 54.5 dB on one side, while the reflection loss on the other side is as low as −43.5 dB. In addition, the LM-based EWSA film maintains positive wave-absorbing and EMS properties during stretching in different directions and it can also effectively avoid EMI after 1000 times of stretching. Overall, the LM-based EWSA film, which enables broadband EMS and wave-absorption, provides a solution for the development of next-generation flexible electronic skin that eliminates both internal and external EMI.

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用于解决柔性传感器电磁干扰的液态金属电磁波屏蔽和吸收膜

电磁干扰（EMI）的存在会导致电流和电压波形失真，从而降低传感器设备的精度和稳定性。柔性电子设备的出现打破了物理空间的限制，因为它们可以随意弯曲和扭曲。然而，这一特性加剧了其内部传感元件之间不必要的耦合，从而导致相互干扰。目前，解决电磁干扰的方法是采用电磁屏蔽（EMS），但仅靠这种方法无法解决柔性传感器件的内部电磁干扰问题。本研究将镓基液态金属（LM）电路印制在 Ecoflex@Fe 薄膜上，实现了同时具有 EMS 和吸波功能的可拉伸薄膜，有望同时解决内部和外部 EMI 的影响。结果表明，电磁波屏蔽和吸收（EWSA）薄膜的一侧屏蔽效率高达 54.5 dB，而另一侧的反射损耗则低至 -43.5 dB。此外，基于 LM 的 EWSA 薄膜在不同方向的拉伸过程中都能保持积极的吸波和 EMS 特性，在拉伸 1000 次后还能有效避免 EMI。总之，基于 LM 的 EWSA 薄膜具有宽带 EMS 和吸波特性，为开发可消除内部和外部 EMI 的下一代柔性电子皮肤提供了解决方案。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.