MXenes公司
材料科学
电磁屏蔽
电磁干扰
纳米纤维素
复合材料
电磁干扰
导电体
微观结构
纳米技术
纤维素
化学工程
电子工程
工程类
作者
Zhihui Zeng,Changxian Wang,Gilberto Siqueira,Daxin Han,Anja Huch,Sina Abdolhosseinzadeh,Jakob Heier,Frank Nüesch,Chuanfang Zhang,Gustav Nyström
标识
DOI:10.1002/advs.202000979
摘要
Abstract Designing lightweight nanostructured aerogels for high‐performance electromagnetic interference (EMI) shielding is crucial yet challenging. Ultrathin cellulose nanofibrils (CNFs) are employed for assisting in building ultralow‐density, robust, and highly flexible transition metal carbides and nitrides (MXenes) aerogels with oriented biomimetic cell walls. A significant influence of the angles between oriented cell walls and the incident EM wave electric field direction on the EMI shielding performance is revealed, providing an intriguing microstructure design strategy. MXene “bricks” bonded by CNF “mortars” of the nacre‐like cell walls induce high mechanical strength, electrical conductivity, and interfacial polarization, yielding the resultant MXene/CNF aerogels an ultrahigh EMI shielding performance. The EMI shielding effectiveness (SE) of the aerogels reaches 74.6 or 35.5 dB at a density of merely 8.0 or 1.5 mg cm –3 , respectively. The normalized surface specific SE is up to 189 400 dB cm 2 g –1 , significantly exceeding that of other EMI shielding materials reported so far.
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