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Buckled AgNW/MXene hybrid hierarchical sponges for high-performance electromagnetic interference shielding.

Authors
  • Weng, Chuanxin1
  • Wang, Guorui2
  • Dai, Zhaohe3
  • Pei, Yongmao4
  • Liu, Luqi2
  • Zhang, Zhong2
  • 1 CAS Key Laboratory of Nanosystem and Hierarchical Fabrication and CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China. [email protected] [email protected] and University of Chinese Academy of Sciences, Beijing 100049, China. , (China)
  • 2 CAS Key Laboratory of Nanosystem and Hierarchical Fabrication and CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China. [email protected] [email protected] , (China)
  • 3 Center for Mechanics of Solids, Structures and Materials, Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, TX 78712, USA.
  • 4 State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, China. , (China)
Type
Published Article
Journal
Nanoscale
Publisher
The Royal Society of Chemistry
Publication Date
Dec 21, 2019
Volume
11
Issue
47
Pages
22804–22812
Identifiers
DOI: 10.1039/c9nr07988b
PMID: 31750492
Source
Medline
Language
English
License
Unknown

Abstract

The development of electromagnetic interference (EMI) shielding materials is moving forward towards being lightweight and showing high-performance. Here, we report on lightweight silver nanowire (AgNW)/MXene hybrid sponges featuring hierarchical structures that are fabricated by a combination of dip-coating and unidirectional freeze-drying methods. The commercial melamine formaldehyde sponges (MF), designed with a buckled structure, are chosen as the template for coating with the AgNW layer (BMF/AgNW). Furthermore, the additional irregular honeycomb architecture composed of MXene assembled cell walls is introduced inside the BMF cell-matrix through unidirectional freeze-drying of MXene aqueous suspensions. Consequently, the BMF/AgNW presents a better EMI shielding effectiveness of 40.0 dB contributed by the conductive network and multiple reflections and scattering compared with the MF/AgNW. Eventually, the resulting AgNW/MXene hybrid sponge exhibits a higher EMI shielding effectiveness of 52.6 dB with a low density of 49.5 mg cm-3 compared with the BMF/AgNW due to synergetic effects of the AgNW and MXene both in conductivity and hierarchical structure. These results also provide a novel way to fabricate lightweight and conductive sponges as high-performance EMI shielding materials.

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