Issue

Vol. 15 (2023)

Self-Healing Liquid Metal Magnetic Hydrogels for Smart Feedback Sensors and High-Performance Electromagnetic Shielding

https://doi.org/10.1007/s40820-023-01043-3
Biao Zhao
School of Microelectronics, Fudan University, Shanghai 2000433, People’s Republic of China
Zhongyi Bai
Key Laboratory of Separation and Processing of Symbiotic‑Associated Mineral Resources in Non‑Ferrous Metal Industry, School of Chemical & Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, People’s Republic of China
Hualiang Lv
Institute of Optoelectronics, Fudan University, Shanghai 200433, People’s Republic of China
Zhikai Yan
Henan Key Laboratory of Aeronautical Materials and Application Technology,, School of Material Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450046, Henan, People’s Republic of China
Yiqian Du
Laboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Academy for Engineering & Technology, Fudan University, Shanghai 200438, People’s Republic of China
Xiaoqin Guo
Henan Key Laboratory of Aeronautical Materials and Application Technology,, School of Material Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450046, Henan, People’s Republic of China
Jincang Zhang
Zhejiang Laboratory, Hangzhou 311100, People’s Republic of China
Limin Wu
Inner Mongolia University, Hohhot 010021, People’s Republic of China
Jiushuai Deng
Key Laboratory of Separation and Processing of Symbiotic‑Associated Mineral Resources in Non‑Ferrous Metal Industry, School of Chemical & Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, People’s Republic of China
David Wei Zhang
School of Microelectronics, Fudan University, Shanghai 2000433, People’s Republic of China
Renchao Che
School of Microelectronics, Fudan University, Shanghai 2000433, People’s Republic of China

Corresponding Author: Renchao Che

rcche@fudan.edu.cn

Nano-Micro Letters, Vol. 15 (2023), Article Number: 79

Abstract

Hydrogels exhibit potential applications in smart wearable devices because of their exceptional sensitivity to various external stimuli. However, their applications are limited by challenges in terms of issues in biocompatibility, custom shape, and self-healing. Herein, a conductive, stretchable, adaptable, self-healing, and biocompatible liquid metal GaInSn/Ni-based composite hydrogel is developed by incorporating a magnetic liquid metal into the hydrogel framework through crosslinking polyvinyl alcohol (PVA) with sodium tetraborate. The excellent stretchability and fast self-healing capability of the PVA/liquid metal hydrogel are derived from its abundant hydrogen binding sites and liquid metal fusion. Significantly, owing to the magnetic constituent, the PVA/liquid metal hydrogel can be guided remotely using an external magnetic field to a specific position to repair the broken wires with no need for manual operation. The composite hydrogel also exhibits sensitive deformation responses and can be used as a strain sensor to monitor various body motions. Additionally, the multifunctional hydrogel displays absorption-dominated electromagnetic interference (EMI) shielding properties. The total shielding performance of the composite hydrogel increases to ~ 62.5 dB from ~ 31.8 dB of the pure PVA hydrogel at the thickness of 3.0 mm. The proposed bioinspired multifunctional magnetic hydrogel demonstrates substantial application potential in the field of intelligent wearable devices.


Highlights:


1 A conductive, stretchable, adaptable, and self-healing, GaInSn/Ni--based composite hydrogel by incorporating a magnetic liquid metal into the hydrogel framework through crosslinking polyvinyl alcohol with sodium tetraborate.
2 The multifunctional composite hydrogels showed outstanding performance for magnetic repair movement sensing, and EMI shielding.

Keywords

EMI shielding Liquid metal Hydrogel Self-healing properties Strain sensor Magnetic patterning
Zhao, Biao, Zhongyi Bai, Hualiang Lv, Zhikai Yan, Yiqian Du, Xiaoqin Guo, Jincang Zhang, Limin Wu, Jiushuai Deng, David Wei Zhang, and Renchao Che. 2023. “Self-Healing Liquid Metal Magnetic Hydrogels for Smart Feedback Sensors and High-Performance Electromagnetic Shielding”. Nano-Micro Letters 15 (March):79. https://doi.org/10.1007/s40820-023-01043-3.
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