Multifunctional Ti3C2TxMXene Composite Hydrogels with Strain Sensitivity toward Absorption-Dominated Electromagnetic-Interference Shielding.
Multifunctional Ti3C2TxMXene Composite Hydrogels with Strain Sensitivity toward Absorption-Dominated Electromagnetic-Interference Shielding.
复制标题
多功能Ti3C2TxMXene复合水凝胶对吸收主导的电磁干扰屏蔽具有应变敏感性。
DOI：
10.1021/acsnano.0c08830
复制
发表时间：
2021-01
期刊：
影响因子：
17.1
通讯作者：
Yunyi Zhu;Ji Liu;Tong Guo;J. Wang;Xiu-Zhi Tang;V. Nicolosi
中科院分区：
文献类型：
--
作者：
Yunyi Zhu;Ji Liu;Tong Guo;J. Wang;Xiu-Zhi Tang;V. Nicolosi
太赫兹技术的快速发展需要高性能的电磁干扰（EMI）屏蔽材料来创造安全的电磁环境。传统的屏蔽材料虽然在实现卓越的屏蔽效率（SE）方面取得了巨大的突破，但其反射率高，一旦形成就不能重新编辑和回收，造成有害的二次电磁污染，适应性差。本文通过生物矿化启发组装路线制备了一种含有MXene和聚丙烯酸的水凝胶型屏蔽材料。该复合水凝胶具有优异的拉伸性和可回收性，良好的形状适应性和粘接性，以及快速的自愈能力，具有很强的应用灵活性和可靠性。更有趣的是，由于多孔结构、中等导电性和内部富水环境的共同作用，水凝胶的屏蔽性能呈现出以吸收为主的特征。在极薄的水凝胶（0.13 mm）中，可以同时获得45.3 dB的高EMI SE和0.2-2.0 THz的宽有效吸收带宽和23.2 dB的优异反射损耗。此外，这种水凝胶表现出敏感的变形响应，可以用作皮肤上的传感器。这项工作不仅为下一代电磁干扰屏蔽材料的设计提供了一种替代策略，而且为在宏观尺度上制备MXene复合材料提供了一种高效、便捷的方法。
The fast development of terahertz technologies demands high-performance electromagnetic interference (EMI) shielding materials to create safe electromagnetic environments. Despite tremendous breakthroughs in achieving superb shielding efficiency (SE), conventional shielding materials have high reflectivity and cannot be re-edited or recycled once formed, resulting in detrimental secondary electromagnetic pollution and poor adaptability. Herein, a hydrogel-type shielding material incorporating MXene and poly(acrylic acid) is fabricated through a biomineralization-inspired assembly route. The composite hydrogel exhibits excellent stretchability and recyclability, favorable shape adaptability and adhesiveness, and fast self-healing capability, demonstrating great application flexibility and reliability. More interestingly, the shielding performance of the hydrogel shows absorption-dominated feature due to the combination of the porous structure, moderate conductivity, and internal water-rich environment. High EMI SE of 45.3 dB and broad effective absorption bandwidth (0.2-2.0 THz) with excellent refection loss of 23.2 dB can be simultaneously achieved in an extremely thin hydrogel (0.13 mm). Furthermore, such hydrogel demonstrates sensitive deformation responses and can be used as an on-skin sensor. This work provides not only an alternative strategy for designing next-generation EMI shielding material but also a highly efficient and convenient method for fabricating MXene composite on macroscopic scales.