Multilayer Ultrathin MXene@AgNW@MoS₂ Composite Film for High-Efficiency Electromagnetic Shielding

Abstract

Structure and material composition is crucial in realizing high electromagnetic interference (EMI) shielding effectiveness (SE). Herein, an ultrathin MXene@AgNW@MoS 2 (MAM) composite film that resembles the structure of a pork belly and exhibits superior EMI shielding performance was fabricated via the vacuum-assisted suction filtration process and atomic layer deposition (ALD). The staggered AgNWs form skeletons and intersperse in MXene sheets to build a doped layer with three-dimensional network structures, which improves the electrical conductivity of the film. Based on the optimal dispersion concentration of Ag in doped and single layers, the MXene/AgNW doped layer and AgNW single layer are alternately vacuumassisted-filtered to obtain laminated structures with multiple heterogeneous interfaces. These interfaces generate interface polarization and increase multiple reflection and scattering, resulting in the increased electromagnetic (EM) wave losses. On the other hand, MoS 2 outer nanolayers fabricated precisely by ALD effectively increases the absorption proportion of electromagnetic waves, reduces the secondary reflection, and improves the stability of EMI shielding properties. Ultimately, an ultrathin MAM film (a thickness of 0.03 mm) with five alternating internal layers and MoS 2 outer layers exhibits an excellent EMI SE of 86.3 dB in the X-band.

Carbonized Syndiotactic Polystyrene/Carbon Nanotube/MXene Hybrid Aerogels with Egg-Box Structure: A Platform for Electromagnetic Interference Shielding and Solar Thermal Energy Management

“…For instance, zero-dimensional (0D) nanoparticles, − one-dimensional (1D) nanotubes/nanowires, ,,, 2D nanosheets, − or a combination of these materials − have been incorporated between MXene layers. For practical purposes, MXene-based EMI shielding materials were fabricated using layer-by-layer assembly techniques, ,,, freeze-casting, ,,,, and segregated compositing. − …”

“…Interlayer spacers were usually introduced to solve the above-mentioned issues. For instance, zero-dimensional (0D) nanoparticles, − one-dimensional (1D) nanotubes/nanowires, ,,, 2D nanosheets, − or a combination of these materials − have been incorporated between MXene layers. For practical purposes, MXene-based EMI shielding materials were fabricated using layer-by-layer assembly techniques, ,,, freeze-casting, ,,,, and segregated compositing. − …”

Multifunctional Flexible AgNW/MXene/PDMS Composite Films for Efficient Electromagnetic Interference Shielding and Strain Sensing

“…Unfortunately, this issue will become even more significant with the rapid iteration of electronic information technology. − Therefore, developing electromagnetic interference (EMI) shielding materials with high flexibility and functional integrity is crucial to meet urgent shielding needs. Several conductive materials, such as carbon materials (graphene and carbon nanotubes), − metal nanowires, , and two-dimensional transition metal carbides and/or nitrides (MXenes), − have been widely used for EMI shielding. For example, Wang et al fabricated a 14.1 μm-thick MXene/amarid nanofiber nanocomposite paper exhibiting an excellent EMI shielding efficiency (SE) of 48 dB.…”

Ultrathin and Flexible ANF/APP/PRGO Composite Films for High-Performance Electromagnetic Interference Shielding and Joule Heating

“…1 Electromagnetic interference (EMI) will not only interfere and seriously affect electronic equipment but also cause harm to human health and the environment. 2,3 In the field of national defense and military, electromagnetic wave leakage will seriously endanger national defense information security and national secret protection. 4,5 Electromagnetic radiation pollution has become the fourth largest public hazard after air pollution, noise pollution, and water pollution.…”

“…With the rapid advances in fifth-generation mobile communication technologies very recently, the use of compact and miniaturized electronic equipment continues to increase, and the electromagnetic environment is also becoming increasingly complex, which inevitably brings more electromagnetic wave pollution problems . Electromagnetic interference (EMI) will not only interfere and seriously affect electronic equipment but also cause harm to human health and the environment. , In the field of national defense and military, electromagnetic wave leakage will seriously endanger national defense information security and national secret protection. , Electromagnetic radiation pollution has become the fourth largest public hazard after air pollution, noise pollution, and water pollution. Therefore, people have done a lot of research to develop effective electromagnetic shielding and electromagnetic absorption materials to alleviate the adverse effects of electromagnetic wave pollution.…”