Multifunctional Aramid Nanofiber/Carbon Nanotube Hybrid Aerogel Films
Multifunctional Aramid Nanofiber/Carbon Nanotube Hybrid Aerogel Films
复制标题
多功能芳纶纳米纤维/碳纳米管杂化气凝胶薄膜
DOI：
10.1021/acsnano.9b07459
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发表时间：
2020-01-01
期刊：
影响因子：
17.1
通讯作者：
Zhang, Xuetong
中科院分区：
文献类型：
--
作者：
Hu, Peiying;Lyu, Jing;Zhang, Xuetong
具有多种功能的轻质、坚固、薄的气凝胶膜是满足当今社会技术要求的理想材料。然而，这些多功能气凝胶膜的制备和应用仍显着不发达。在此，我们展示了一种由强芳纶纳米纤维（ANFs）、导电碳纳米管（CNTs）和疏水碳氟化合物（FC）树脂组成的多功能气凝胶膜。所得的杂化气凝胶膜具有较大的比表面积（232.8 m(2)）。g(-1))，高导电性（230 S.m(-1)），优异的疏水性（接触角高达137.0度），具有卓越的焦耳加热性能和最高的电磁干扰（EMI）屏蔽效率。FC涂层使亲水性的ANF/CNT气凝胶膜具有疏水性，从而具有优异的自清洁性能。高导电性使其具有低电压驱动的焦耳加热特性和568 μ m厚度下x波段的EMI屏蔽效率（SE）为54.4 dB，比EMI SE高达33528.3 dB.cm(2)。G(-1)，这是典型的金属、导电聚合物或碳基复合材料的最高值之一。这种多功能气凝胶薄膜在智能服装、电磁波屏蔽和个人热管理系统方面具有很大的前景。
Lightweight, robust, and thin aerogel films with multifunctionality are highly desirable to meet the technological demands of current society. However, fabrication and application of these multifunctional aerogel films are still significantly underdeveloped. Herein, we demonstrate a multifunctional aerogel film composed of strong aramid nanofibers (ANFs), conductive carbon nanotubes (CNTs), and hydrophobic fluorocarbon (FC) resin. The obtained hybrid aerogel film exhibits large specific surface area (232.8 m(2).g(-1)), high electrical conductivity (230 S.m(-1)), and excellent hydrophobicity (contact angle of up to 137.0 degrees) with exceptional Joule heating performance and supreme electromagnetic interference (EMI) shielding efficiency. The FC coating renders the hydrophilic ANF/CNT aerogel films hydrophobic, resulting in an excellent self-cleaning performance. The high electrical conductivity enables a low-voltage-driven Joule heating property and an EMI shielding effectiveness (SE) of 54.4 dB in the X-band at a thickness of 568 mu m. The specific EMI SE is up to 33528.3 dB.cm(2).g(-1), which is among the highest values of typical metal-, conducting-polymer-, or carbon-based composites. This multifunctional aerogel film holds great promise for smart garments, electromagnetic wave shielding, and personal thermal management systems.