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Research Article

Heterogeneous MXene-based films with graded electrical conductivity towards highly efficient EMI shielding and electrothermal heating

Yu Zhang1,2, Guangcheng Zhang2( ), Zhonglei Ma2, Jianbin Qin2, Xi Shen1,3( )
Department of Aeronautical and Aviation Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
Research Institute for Sports Science and Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
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Graphical Abstract

We report the development of a heterogeneous composite film comprising a porous multi-walled carbon nanotubes/bacterial cellulose film and an aligned MXene/Ag nanowires backing. The film shows excellent electromagnetic interference (EMI) shielding effectiveness and energy-efficient electrothermal heating.

Abstract

The increasing need for electromagnetic interference (EMI) shielding of electronics in cold environments such as those in aircraft, space exploration, and wearable heaters to avoid hazardous icing conditions or hypothermia requires the development of thin and lightweight EMI shielding materials preferably by absorbing rather than reflecting electromagnetic (EM) waves while also generating heat through energy-efficient electrothermal conversion. However, it is challenging to achieve absorption-dominant EMI shielding and energy-efficient electrothermal heating simultaneously in a thin and lightweight structure. Here, we develop a heterogeneous composite film comprising a porous multi-walled carbon nanotubes (MWCNTs)/bacterial cellulose (BC) film and an aligned MXene/Ag nanowires (NWs) backing via a sequential vacuum filtration process. The porous film contains random conductive networks of MWCNTs with moderate conductivity while the aligned MXene sheets atop Ag NWs network affords high conductivity in the backing, giving rise to graded electrical conductivity for absorption-dominant EMI shielding. The increasing Ag NW coverage leads to significantly increased electrical conductivity without increasing the EM wave reflection as well as the density and thickness of the film, yielding excellent specific EMI shielding effectiveness (> 8500 dB/(g·cm2)), low driving voltage for energy-efficient electrothermal heating (163 °C at 2.5 V), and fast response time (60 s) at a low areal density of 0.015 mg/cm2. Combining EMI shielding and electrothermal heating, the heterogeneous film developed here are promising contenders for the protection of electronic equipment in low-temperature environment.

Keywords

heterogenous composite filmMXeneelectromagnetic interference (EMI) shieldingthermal management

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Nano Research
Volume 17 Issue 8,
August 2024
Pages 7264-7274
DOI: 10.1007/s12274-024-6709-z
Cite this article:
Zhang Y, Zhang G, Ma Z, et al. Heterogeneous MXene-based films with graded electrical conductivity towards highly efficient EMI shielding and electrothermal heating. Nano Research, 2024, 17(8): 7264-7274. https://doi.org/10.1007/s12274-024-6709-z
Topics:
AerogelsCarbonNanowiresSelf assembly

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Received: 08 March 2024
Revised: 14 April 2024
Accepted: 16 April 2024
Published: 28 May 2024
© Tsinghua University Press 2024
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