Ultra‐Flyweight Cryogels of MXene/Graphene Oxide for Electromagnetic Interference Shielding
Ultra‐Flyweight Cryogels of MXene/Graphene Oxide for Electromagnetic Interference Shielding
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DOI：
10.1002/adfm.202304748
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发表时间：
2023-08
影响因子：
19
通讯作者：
Ahmadreza Ghaffarkhah;S. Hashemi;S. Rostami;Majed Amini;Farhad Ahmadijokani;Ali Pournaghshband Isfahani;S. Mhatre;Orlando J. Rojas;M. Kamkar;S. Wuttke;M. Soroush;M. Arjmand
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文献类型：
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作者：
Ahmadreza Ghaffarkhah;S. Hashemi;S. Rostami;Majed Amini;Farhad Ahmadijokani;Ali Pournaghshband Isfahani;S. Mhatre;Orlando J. Rojas;M. Kamkar;S. Wuttke;M. Soroush;M. Arjmand
由于其优异的导电性、低密度和通过众多内部界面消散电磁波的能力，MXene和石墨烯冷冻剂表现出了出色的电磁干扰（EMI）屏蔽效果。然而，它们的合成需要昂贵的还原技术和/或预处理方法，如冷冻铸造，以实现高电磁干扰屏蔽和机械性能。此外，在优化低温凝胶的微观结构和孔隙度以提高电磁干扰屏蔽效能的同时减少材料消耗的研究也很少。本文提出了一种新的方法来生产由Ti3C2Tx/氧化石墨烯（GO）组成的具有多尺度孔隙度的超轻质低温剂，以实现高性能的电磁干扰屏蔽。这种方法使用可控制的模板，通过丝状结构液体的界面组装，这些液体很容易转化为EMI冷冻剂。所获得的超重量低温剂（3 - 7 mg cm - 3）具有出色的特定EMI屏蔽效果（33 000 - 50 000 dB cm2 g - 1），同时无需化学或热还原。此外，当使用Ti3C2Tx/GO低温剂作为导电环氧纳米复合材料的骨架时，可以实现出色的屏蔽效果，在低填料负载（0.3-0.7 wt%）下，产生31.7-51.4 dB的EMI屏蔽效果。总的来说，一种独一无二的EMI屏蔽系统被引入，它易于处理，同时提供可扩展性和性能。
MXene and graphene cryogels have demonstrated excellent electromagnetic interference (EMI) shielding effectiveness due to their exceptional electrical conductivity, low density, and ability to dissipate electromagnetic waves through numerous internal interfaces. However, their synthesis demands costly reduction techniques and/or pre‐processing methods such as freeze‐casting to achieve high EMI shielding and mechanical performance. Furthermore, limited research has been conducted on optimizing the cryogel microstructures and porosity to enhance EMI shielding effectiveness while reducing materials consumption. Herein, a novel approach to produce ultra‐lightweight cryogels composed of Ti3C2Tx/graphene oxide (GO) displaying multiscale porosity is presented to enable high‐performance EMI shielding. This method uses controllable templating through the interfacial assembly of filamentous‐structured liquids that are readily converted into EMI cryogels. The obtained ultra‐flyweight cryogels (3–7 mg cm−3) exhibit outstanding specific EMI shielding effectiveness (33 000–50 000 dB cm2 g−1) while eliminating the need for chemical or thermal reduction. Furthermore, exceptional shielding is achieved when the Ti3C2Tx/GO cryogels are used as the backbone of conductive epoxy nanocomposites, yielding EMI shielding effectiveness of 31.7–51.4 dB at a low filler loading (0.3–0.7 wt%). Overall, a one‐of‐a‐kind EMI shielding system is introduced that is readily processed while affording scalability and performance.