Aligning graphene sheets in aerogel-based composites for enhanced electromagnetic interference absorption

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon Pub Date : 2025-05-23 DOI:10.1016/j.carbon.2025.120463

Ji Hun Seo , Hyun Seong Yang , Min Ho Seo , Seon Joon Kim , Juyun Lee , Seyoung Kee , Saeed Habibpour , Sung-Nam Lim , Wook Ahn , Yun-Seok Jun

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引用次数: 0

Abstract

This study investigates graphene aerogel-based polydimethylsiloxane (PDMS) composites designed to improve electromagnetic interference (EMI) absorption. These composites are fabricated by infiltrating PDMS into graphene aerogel produced by uni-directional freezing and thermal reduction. This results in a graphene structure with highly aligned orientations. The composites in longitudinal directions exhibit a shielding effectiveness by absorption (SE_A) of 8.6 dB/mm and a shielding effectiveness by total (SE_T) of 11.5 dB/mm in 8.2–12.4 (X-band) frequency range. On the other hand, the transverse direction shows a lower EMI shielding capability with a SE_A of 4.5 dB/mm and a SE_T of 6.7 dB/mm. These are attributed to the fact that the aligned orientation of the fillers increased the internal multiple scattering of incident electromagnetic wave, which increases the propagation path and energy attenuation. These results demonstrate that controlling the filler orientation can significantly increase the EMI performances of graphene/PDMS composites.

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在气凝胶基复合材料中对齐石墨烯片以增强电磁干扰吸收

本研究研究了石墨烯气凝胶基聚二甲基硅氧烷（PDMS）复合材料，旨在提高电磁干扰（EMI）的吸收。这些复合材料是通过将PDMS渗透到通过单向冷冻和热还原制备的石墨烯气凝胶中制备的。这导致石墨烯结构具有高度排列的取向。在8.2 ~ 12.4 （x波段）频率范围内，复合材料的纵向吸收屏蔽效能（SEA）为8.6 dB/mm，总屏蔽效能（SET）为11.5 dB/mm。另一方面，横向屏蔽能力较低，SEA为4.5 dB/mm， SET为6.7 dB/mm。这是由于填料的排列方向增加了入射电磁波的内部多次散射，从而增加了传播路径和能量衰减。这些结果表明，控制填料取向可以显著提高石墨烯/PDMS复合材料的电磁干扰性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Carbon 工程技术-材料科学：综合

CiteScore

20.80

自引率

7.30%

发文量

审稿时长

23 days

期刊介绍： The journal Carbon is an international multidisciplinary forum for communicating scientific advances in the field of carbon materials. It reports new findings related to the formation, structure, properties, behaviors, and technological applications of carbons. Carbons are a broad class of ordered or disordered solid phases composed primarily of elemental carbon, including but not limited to carbon black, carbon fibers and filaments, carbon nanotubes, diamond and diamond-like carbon, fullerenes, glassy carbon, graphite, graphene, graphene-oxide, porous carbons, pyrolytic carbon, and other sp2 and non-sp2 hybridized carbon systems. Carbon is the companion title to the open access journal Carbon Trends. Relevant application areas for carbon materials include biology and medicine, catalysis, electronic, optoelectronic, spintronic, high-frequency, and photonic devices, energy storage and conversion systems, environmental applications and water treatment, smart materials and systems, and structural and thermal applications.