Open AccessNanocellulose‐MXene Biomimetic Aerogels with Orientation‐Tunable Electromagnetic Interference Shielding Performance
Author(s) -
Zeng Zhihui,
Wang Changxian,
Siqueira Gilberto,
Han Daxin,
Huch Anja,
Abdolhosseinzadeh Sina,
Heier Jakob,
Nüesch Frank,
Zhang Chuanfang John,
Nyström Gustav
Publication year - 2020
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202000979
Subject(s) - mxenes , materials science , electromagnetic shielding , emi , nanocellulose , composite material , electromagnetic interference , electrical conductor , microstructure , nanotechnology , cellulose , chemical engineering , electronic engineering , engineering
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.