Micro-porous MXene/Aramid nanofibers hybrid aerogel with reversible compression and efficient EMI shielding performance
Micro-porous MXene/Aramid nanofibers hybrid aerogel with reversible compression and efficient EMI shielding performance
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DOI：
10.1016/j.compositesb.2021.108853
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发表时间：
2021-04-18
影响因子：
13.1
通讯作者：
Xie, Fan
中科院分区：
文献类型：
--
作者：
Lu, Zhaoqing;Jia, Fengfeng;Xie, Fan
当前，电子设备和无线设备的广泛使用，要求人类采取积极的措施来减弱有害的电磁波辐射。以芳纶纳米纤维和MXene（Ti3C2Tx）薄片为原料，通过冷冻干燥法制备微孔结构MXene/芳纶纳米纤维杂化气凝胶。芳纶纳米纤维具有较强的抗氧化性能，为骨架的抗氧化和可逆压缩性能奠定了基础。由于独特的微孔结构，MXene(Ti3C2Tx)/芳纶纳米纤维杂化气凝胶保持了高效的屏蔽能力，在x波段厚度为1.9 mm时，其电磁干扰屏蔽效能和比电磁干扰屏蔽效能分别达到56.8 dB和3645.7 dB cm(2) g（-1）。此外，MXene（Ti3C2Tx）的含量和厚度可调节其屏蔽性能。随着MXene（Ti3C2Tx）负载的增加，MXene(Ti3C2Tx)/芳纶纳米纤维杂化气凝胶的孔隙尺寸增大，MXene(Ti3C2Tx)/芳纶纳米纤维杂化气凝胶的韧性增强。在40%应变下，MXene(Ti3C2Tx)/芳纶纳米纤维混合气凝胶的最大压缩应力达到210 kPa。本研究为同时制备具有可逆压缩性能和高效电磁干扰屏蔽性能的杂化气凝胶提供了可行途径。
Currently, extensive utilization of electronic devices and wireless equipment require human to take affirmative measures to weaken unwanted electromagnetic wave radiations. Herein, micro-porous structure MXene/aramid nanofibers hybrid aerogel was developed from aramid nanofibers and MXene(Ti3C2Tx) flakes through freeze-drying approach. The robust aramid nanofibers established foundation for oxidation protection and reversible compressibility in skeleton. Due to the unique micro-porous structure, the MXene(Ti3C2Tx)/aramid nanofibers hybrid aerogel remained efficient shielding capacity, whose electromagnetic interference (EMI) shielding effectiveness and specific EMI shielding effectiveness reached similar to 56.8 dB and 3645.7 dB cm(2) g(-1) at thickness of 1.9 mm in X-band. Furthermore, the shielding performance could be regulated by MXene(Ti3C2Tx) content and thickness. With increasing MXene(Ti3C2Tx) loading, the porous size of MXene(Ti3C2Tx)/aramid nanofibers hybrid aerogel enlarged, and the MXene(Ti3C2Tx)/aramid nanofibers hybrid aerogel became tough and robust. Under 40% strain, the maximum compressive stress of MXene(Ti3C2Tx)/aramid nanofibers hybrid aerogel with 21 wt% MXene(Ti3C2Tx) flakes content reached similar to 210 kPa. This work provided feasible avenue for fabricating hybrid aerogel with reversible compressibility and efficient EMI shielding performance simultaneously.