Asymmetric Structural Design for Absorption‐Dominated Electromagnetic Interference Shielding Composites

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 28, 2025

Abstract Excessive electromagnetic pollution caused by waves can interfere with the normal use of electronic devices or cause unnecessary damage to human health. Although conductive polymer composites (CPCs) are used replace traditional metals as an effective strategy for managing undesirable waves, CPCs have a non‐negligible trade‐off in enhancement interference (EMI) shielding effectiveness and absorption coefficient because their reflection‐dominated EMI mechanism. Therefore, alleviate secondary pollution, absorption‐dominated asymmetric structures urgently needed. Recently, structural designs advanced significantly, but seldom been summarized discussed detail. Consequently, this review first systematically summarizes current progress after brief clarification about necessity configuration structure design. Afterward, various fiber, layered, porous, composite described. Besides, versatility is briefly introduced. Finally, challenges prospects proposed guide future advancement field.

Language: Английский

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Thin, Lightweight, and Highly Efficient Electromagnetic Interference Shielding Nanocomposites Composed of a π-Conjugated Block Copolymer Nanowire/Multiwalled Carbon Nanotube Bicontinuous Interpenetrating Network

ACS Omega, Journal Year: 2025, Volume and Issue: unknown

Published: April 3, 2025

We developed high-performance electromagnetic interference (EMI) shielding composites by integrating a π-conjugated block polymer system with carbon nanofillers. First, poly(3-hexylthiophene)-poly(ε-caprolactone) (P3HT-PCL) copolymer was synthesized through combination of Grignard metathesis, tail modifications, and ring-opening polymerization. Controlling the solvent type aging time resulted in self-assembly P3HT-PCL chains into nanoscale fibers. When multiwalled nanotubes (MWCNTs) were added to solution, π-π interactions between thiophene rings benzene units MWCNTs facilitated dispersal hybrid solution. Self-assembled prompted formation nanofibrillar framework, which beneficial stabilize overall structural distribution system, thereby synergistically forming P3HT-PCL/MWCNT composite bicontinuous interpenetrating network. The conductive skeleton formed effective connections one-dimensional geometric made this highly an excellent EMI material. Moreover, introduction PCL helped overcome problems related rigid nature P3HT, facilitating manufacture thin, lightweight, sheets. film 0.05 mm thick provided optimized effectiveness up 29.4 dB, effectively blocking nearly 99.89% incident waves. results research provide innovative promising direction for development advanced materials.

Language: Английский

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Low-value biomass-derived carbon composites for electromagnetic wave absorption and shielding: A review

New Carbon Materials, Journal Year: 2025, Volume and Issue: 40(2), P. 293 - 316

Published: April 1, 2025

Language: Английский

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Ultrathin MWCNT/Ti3C2Tx Hybrid Films for Electromagnetic Interference Shielding

Nanomaterials, Journal Year: 2024, Volume and Issue: 15(1), P. 6 - 6

Published: Dec. 25, 2024

The disordered assembly and low conductivity of carbon nanotubes are the main problems that limit application electromagnetic interference (EMI) shielding. In this work, an ordered lamellar structure multiwalled nanotube/Ti3C2Tx (MWCNT/Ti3C2Tx) hybrid films was achieved by vacuum-assisted filtration through hybridization Ti3C2Tx nanosheets nanotubes, where were tightly sticking on surface via physical adsorption hydrogen bonding. Compared with pure films, MWCNT/Ti3C2Tx a significant improvement in 452.5 S/cm EMI shielding effectiveness (SE) 44.3 dB under 50 wt% thickness (8.6 μm) orderly stacking structure, which finally resulted high specific SE (SSE/t, divided density thickness) 55,603.1 dB∙cm2∙g−1.

Language: Английский

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