Electromagnetic absorption materials: Current progress and new frontiers

Progress in Materials Science, Journal Year: 2022, Volume and Issue: 127, P. 100946 - 100946

Published: March 17, 2022

Language: Английский

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Controlled Distributed Ti₃C₂T_x Hollow Microspheres on Thermally Conductive Polyimide Composite Films for Excellent Electromagnetic Interference Shielding

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(16)

Published: Jan. 27, 2023

Flexible multifunctional polymer-based electromagnetic interference (EMI) shielding composite films have important applications in the fields of 5G communication technology, wearable electronic devices, and artificial intelligence. Based on design a porous/multilayered structure using polyimide (PI) as matrix polymethyl methacrylate (PMMA) microspheres template, flexible (Fe3 O4 /PI)-Ti3 C2 Tx -(Fe3 /PI) with controllable pore sizes distribution Ti3 hollow are successfully prepared by sacrificial template method. Owing to structure, when size is 10 µm mass ratio PMMA/Ti3 2:1, film has most excellent EMI performance, effectiveness (EMI SE) 85 dB. It further verified finite element simulation that an effect waves. In addition, good thermal conductivity (thermal coefficient 3.49 W (m·K)-1 ) mechanical properties (tensile strength 65.3 MPa). This conductivity, demonstrated great potential for protection high-power, portable, devices.

Language: Английский

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Oxygen Vacancy‐Induced Dielectric Polarization Prevails in the Electromagnetic Wave‐Absorbing Mechanism for Mn‐Based MOFs‐Derived Composites

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(34)

Published: June 14, 2022

Abstract Polymeric metal‐organic framework (MOF)‐derived composites are promising functional materials because of their exceptional chemical homogeneity, designable components, and adjustable pore size. The modulation oxygen Mn vacancies via the introduction heteroatoms changes in annealing temperature MOFs‐derived can be a possible solution to investigate polarization loss mechanism, which facilitates improvement electromagnetic capacity. Herein, design laminate‐stacked sphere‐shaped trimetallic CoNiMn‐MOFs is presented. derived CoNi/MnO@C retain original topography MOFs. concentration increases with incorporation heteroatoms, but decreases temperature, prevails mechanism rather than contribution 2+ heterogeneous interfaces. Therefore, minimum reflection sample demonstrates −55.2 dB at 2.6 mm broad effective absorption bandwidth reaches 8.0 GHz 2.1 mm. This work expected provide meaningful insights into significant effect ion vacancy on EM wave‐absorbing performance Mn‐based composites.

Language: Английский

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Vertically Aligned Silicon Carbide Nanowires/Boron Nitride Cellulose Aerogel Networks Enhanced Thermal Conductivity and Electromagnetic Absorbing of Epoxy Composites

Nano-Micro Letters, Journal Year: 2022, Volume and Issue: 14(1)

Published: April 30, 2022

Abstract With the innovation of microelectronics technology, heat dissipation problem inside device will face a severe test. In this work, cellulose aerogel (CA) with highly enhanced thermal conductivity (TC) in vertical planes was successfully obtained by constructing vertically aligned silicon carbide nanowires (SiC NWs)/boron nitride (BN) network via ice template-assisted strategy. The unique structure SiC NWs connected to BN ensures that TC composite direction reaches 2.21 W m −1 K at low hybrid filler loading 16.69 wt%, which increased 890% compared pure epoxy (EP). addition, relying on porous CA, EP-based also showed higher than other comparative samples horizontal direction. Meanwhile, exhibits good electrically insulating volume electrical resistivity about 2.35 × 10 11 Ω cm and displays excellent electromagnetic wave absorption performance minimum reflection loss − 21.5 dB wide effective bandwidth (< dB) from 8.8 11.6 GHz. Therefore, work provides new strategy for manufacturing polymer-based composites multifunctional performances microelectronic packaging applications.

Language: Английский

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Bioinspired, High-Strength, and Flexible MXene/Aramid Fiber for Electromagnetic Interference Shielding Papers with Joule Heating Performance

ACS Nano, Journal Year: 2022, Volume and Issue: 16(4), P. 6700 - 6711

Published: March 25, 2022

High-strength, flexible, and multifunctional characteristics are highly desirable for electromagnetic interference (EMI) shielding materials in the field of electric devices. In this work, inspired by natural nacre, we fabricated large-scale, layered MXene/amarid nanofiber (ANF) nanocomposite papers blade-coating process plus sol-gel conversion step. The as-synthesized possess excellent mechanical performance, that is, exceptional tensile strength (198.80 ± 5.35 MPa), large strain (15.30 1.01%), good flexibility (folded into various models without fracture), which ascribed to synergetic interactions interconnected three-dimensional network frame hydrogen bonds between MXene ANF. More importantly, with extensive continuous conductive paths formed nanosheets present a high EMI effectiveness 13188.2 dB cm2 g-1 frequency range 8.2-12.4 GHz. interestingly, show Joule heating performance fast thermal response (<10 s) low driving voltage (≤4 V). As such, large-scale MXene/ANF considered as promising alternatives wide applications management.

Language: Английский

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Multicomponent Nanoparticles Synergistic One-Dimensional Nanofibers as Heterostructure Absorbers for Tunable and Efficient Microwave Absorption

Nano-Micro Letters, Journal Year: 2022, Volume and Issue: 15(1)

Published: Dec. 15, 2022

Application of novel radio technologies and equipment inevitably leads to electromagnetic pollution. One-dimensional polymer-based composite membrane structures have been shown be an effective strategy obtain high-performance microwave absorbers. Herein, we reported a one-dimensional N-doped carbon nanofibers material which encapsulated the hollow Co3SnC0.7 nanocubes in fiber lumen by electrospinning. Space charge stacking formed between nanoparticles can channeled longitudinal fibrous structures. The dielectric constant fibers is highly related carbonization temperature, great impedance matching achieved synergetic effect network. At 800 °C, necklace-like Co3SnC0.7/CNF with 5% low load achieves excellent RL value - 51.2 dB at 2.3 mm absorption bandwidth 7.44 GHz thickness 2.5 mm. multiple wave (EMW) reflections interfacial polarization internal contribute major attenuating EMW. These strategies for regulating performance expanded other functional materials facilitate development emerging

Language: Английский

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Tunable Co/ZnO/C@MWCNTs based on carbon nanotube-coated MOF with excellent microwave absorption properties

Journal of Material Science and Technology, Journal Year: 2022, Volume and Issue: 127, P. 153 - 163

Published: April 21, 2022

Language: Английский

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Recent progress on multifunctional electromagnetic interference shielding polymer composites

Journal of Material Science and Technology, Journal Year: 2022, Volume and Issue: 134, P. 106 - 131

Published: July 22, 2022

Language: Английский

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The art of framework construction: hollow-structured materials toward high-efficiency electromagnetic wave absorption

Advanced Composites and Hybrid Materials, Journal Year: 2022, Volume and Issue: 5(3), P. 1658 - 1698

Published: June 17, 2022

Language: Английский

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Construction of three-dimensional hierarchical porous nitrogen-doped reduced graphene oxide/hollow cobalt ferrite composite aerogels toward highly efficient electromagnetic wave absorption

Journal of Material Science and Technology, Journal Year: 2022, Volume and Issue: 132, P. 193 - 200

Published: July 6, 2022

Language: Английский

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