气凝胶
焦耳加热
材料科学
电磁屏蔽
芳纶
电磁干扰
MXenes公司
碳纳米管
复合数
电磁干扰
复合材料
热导率
纳米复合材料
纳米技术
电气工程
工程类
纤维
作者
Zhen Yan,Yulin Ding,Meirong Huang,Junfeng Li,Qinxue Han,Meiqi Yang,Wenmu Li
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2023-03-31
卷期号:6 (7): 6141-6150
被引量:31
标识
DOI:10.1021/acsanm.3c00249
摘要
It is a considerable challenge to develop a composite material with ultra-light and high electromagnetic interference (EMI) shielding efficiency for the next generation of electronic equipment. MXenes have received extensive attention in composite aerogel EMI shielding due to their abundant surface groups and ultra-high conductivity. However, the poor mechanical properties make them difficult to apply on a large scale. Here, we demonstrate a simple method to construct ultra-light conductive Ti3C2Tx MXene/aramid nanofibers (ANFs)/carbon nanotubes (CNTs) aerogels with a "sandwich" structure. CNTs and MXene absorb and reflect electromagnetic waves, while ANF aerogel provides good mechanical strength. Our composite aerogels with an extra-high EMI shielding efficiency of up to 69.0 dB at the X-band, despite their thickness and density being only 2 mm and 0.0428 g/cm3, respectively. At the same time, the composite aerogel with a low 0.0488 W/(m·K) thermal conductivity shows extraordinary flame resistance, heat preservation, and insulation ability. Besides, MXene/ANFs/CNTs aerogel can reach 104 °C in 3 s under an 8 V voltage and shows long-term Joule heating stability. This work provides a forward-looking idea for building multifunctional EMI shielding materials. The obtained aerogels have potential applications in aerospace, portable electronic devices, and defense industries.
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