Flexible, lightweight carbon nanotube sponges and composites for high-performance electromagnetic interference shielding
Flexible, lightweight carbon nanotube sponges and composites for high-performance electromagnetic interference shielding
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用于高性能电磁干扰屏蔽的柔性轻质碳纳米管海绵和复合材料
DOI：
10.1016/j.carbon.2018.03.061
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发表时间：
2018-07-01
期刊：
影响因子：
10.9
通讯作者：
Gui, Xuchun
中科院分区：
文献类型：
--
作者：
Lu, Dongwei;Mo, Zichao;Gui, Xuchun
柔性、低密度、高性能的电磁干扰（EMI）屏蔽材料是航空航天和柔性电子器件迫切需要的材料。由于碳纳米管（CNTs）具有高宽高比和高导电性，因此被认为是最有希望提供优异电磁干扰屏蔽性能的候选材料之一。在这里，由自组装、相互连接的碳纳米管骨架组成的柔性海绵状碳纳米管，其密度为10.0 mg/cm(3)，直接用作EMI屏蔽膜。厚度为1.8 mm的独立式碳纳米管海绵在x波段的电磁干扰屏蔽效能（SE）和比SE （SSE）分别为54.8 dB和5480 dB cm(3)/g。碳纳米管海绵的性能可以通过增加样品的厚度或密度来进一步改善。在与PDMS直接渗透复合后，在厚度为2.0 mm时，cnts /PDMS膜仍具有良好的EMI SE (46.3 dB)，而碳纳米管加载量小于1.0 wt%。经过1000次反复拉伸或弯曲后，复合材料的电磁干扰系数几乎没有变化。柔性、稳定性和高导电性的纳米复合材料可直接用作包装、电子和通信等领域的高性能EMI屏蔽膜。(C) 2018 Elsevier Ltd.版权所有。
Flexible, low-density, high-performance electromagnetic interference (EMI) shielding performance materials are urgently required in aerospace and flexible electronic devices. Due to the high aspect ratio and conductivity, carbon nanotube (CNTs) has been considered as one of the most promising candidates for providing excellent EMI shielding performance. Here, a flexible spongy CNTs consisting of self-assembled, interconnected CNT skeletons, with a density of 10.0 mg/cm(3), was directly used as EMI shielding film. The freestanding CNT sponge with a thickness of 1.8 mm shows highly EMI shielding effectiveness (SE) and specific SE (SSE) of 54.8 dB and 5480 dB cm(3)/g in X-band, respectively. The performance of the CNT sponges can be further improved by increasing the thickness or density of the samples. After composited with PDMS by directly infiltrating method, the CNT/PDMS film still exhibits excellent EMI SE (46.3 dB) at the thickness of 2.0 mm, while the CNT loading content is less than 1.0 wt%. The EMI SE of the composite is almost unchanged after repeated stretching or bending for 1000 cycles. The flexible, stability, and highly conductive nanocompsite can be directly used as high-performance EMI shielding films in areas such as packaging, electronics and communication. (C) 2018 Elsevier Ltd. All rights reserved.