Abstract
Electromagnetic interference (EMI) and radiation of electronic devices are ubiquitous, which are potentially hazardous to the normal operation of electronic equipment and human health. MXenes are extremely attractive in the preparation of EMI shielding materials due to their excellent metallic conductivity and tunable surface chemistry. Herein, by virtue of the designed nanostructure and regulation of interface interactions, we fabricated flexible Fe3O4@Ti3C2Tx MXene/3,4-dihydroxyphenylacetic acid (DOPAC)-epoxidized natural rubber (ENR) elastomers (FMDE) with 3D segregated interconnected structures. The elaborately designed metal-ligand coordination crosslinking between Fe3O4 nanoparticles and DOPAC ligand molecules provides strong interfacial interactions, resulting in significantly reinforced mechanical properties. Compared with Ti3C2Tx/ENR elastomers, the maximum tensile strength and toughness of FMDE are elevadted by ~306% and 475%, respectively. Moreover, the 3D segregated conductive network constructed by Fe3O4@Ti3C2Tx nanoflakes resulted from volume exclusion effect of ENR latex and the introduction of magnetic Fe3O4 nanoparticles with enhanced electromagnetic wave absorption greatly improved the EMI shielding performance of FMDE, exhibiting an excellent EMI shielding effectiveness of up to 58 dB in the X band (8.2–12.4 GHz) and stable EMI shielding capability during repeated deformations. This work provides a promising strategy for the design and manufacture of novel flexible EMI shielding materials.
摘要
电磁干扰和辐射无处不在, 可能对电子设备的**常运行和人 体健康造成危害. MXene具有出色的金属导电性和可调的表面化 学, 在屏蔽材料的制备中极具吸引力. 本文通过结构设计和界面调 控, 制备了具有隔离网络结构的柔性Fe3O4@Ti3C2Tx MXene/3,4-二 羟基苯基乙酸(DOPAC)-环氧化天然橡胶(ENR)弹性体(FMDE). Fe3O4与DOPAC配体分子之间的金属-配体配位交联提供了**大的 界面相互作用, 从而显著增**复合材料的机械性能. 与Ti3C2Tx/ENR弹性体相比, FMDE的最大拉伸**度和韧性分别提高了~306% 和~475%. 此外, 借助ENR胶乳的体积排斥效应构建的3D隔离导电 网络, 以及引入的磁性Fe3O4纳米颗粒有效地改善了FMDE的电磁 屏蔽性能, 且证实了FMDE在反复弯曲拉伸后仍具有稳定的电磁屏 蔽能力.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (51861165203), China Postdoctoral Science Foundation (2019M653398) and Sichuan Science and Technology Program (2020YJ0261). We would like to thank the Analytical & Testing Centre of Sichuan University for XPS, TEM and we would be grateful to Gui** Yuan for her help in TEM characterization. We also thank Shiyanjia Lab (www.shiyanjia.com) for the support of VSM and XRD test.
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Lu C and Zhou Z were responsible for the experimental concept and design; Song Q and Chen B carried out most of the experiments, characterization and data analyses. Song Q wrote the paper with support from Lu C and Zhou Z. All authors contributed to the general discussion.
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The authors declare no conflict of interest.
Quancheng Song is currently a Master candidate under the supervision of Prof. Lu at the State Key Laboratory of Polymer Materials Engineering, Sichuan University. His research interest focuses on the flexible polymer functional composite materials.
Zehang Zhou is currently a postdoctoral researcher at the State Key Laboratory of Polymer Materials Engineering, Sichuan University. He received his PhD in materials science and engineering from Sichuan University in 2018. He worked as a visiting researcher in the Department of Materials Science and Engineering, University of Philadelphia from 2015 to 2017. His research interests focus on the fabrication and application of polymer functional composite materials and natural polymer composite.
Canhui Lu is currently a professor at the State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University. He received his PhD from Sichuan University in 2002. His research areas include polymer blends and composites, design and fabrication of nanocellulose-based electrochemical energy storage devices, flexible triboelectric nanogenerators for self-powered functional electronics, and polymer solid phase mechanochemistry and highly filled polymer composites.
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Flexible, stretchable and magnetic Fe3O4@Ti3C2Tx/elastomer with supramolecular interfacial crosslinking for enhancing mechanical and electromagnetic interference shielding performance
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Song, Q., Chen, B., Zhou, Z. et al. Flexible, stretchable and magnetic Fe3O4@Ti3C2Tx/elastomer with supramolecular interfacial crosslinking for enhancing mechanical and electromagnetic interference shielding performance. Sci. China Mater. 64, 1437–1448 (2021). https://doi.org/10.1007/s40843-020-1539-2
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DOI: https://doi.org/10.1007/s40843-020-1539-2