Sacrificial-assisted long-range lamellar MXene/rGO aerogel for electromagnetic interference shielding and thermal insulation

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon Pub Date : 2025-09-04 DOI:10.1016/j.carbon.2025.120759

Haodong Gu , Li Tian , Qiuqi Zhang , Xiao You , Mengmeng Wang , Feiyan Cai , Jinshan Yang , Shaoming Dong

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Abstract

Electromagnetic protection and thermal protection are of great importance to delicate instruments. Aerogels with ordered structural orientation offer a huge potential in dissipating electromagnetic wave energy and isolating heat. However, achieving precise control over the long-range order in aerogels remains significant challenges, impeding their further development and multifunctional applications. Hence, the MXene/rGO aerogels (LMG) with long-range lamellar structure are constructed by sacrificial-assisted bidirectional freeze-casting. The LMG demonstrates superior electromagnetic interference (EMI) shielding performance with an absolute shielding effectiveness (SSE/t) of 14933.3 dB cm² g⁻¹. The highly ordered layers effectively hinder the thermal conduction between adjacent layers, achieving a thermal conductivity of only 30.8 mW m⁻¹ K⁻¹. Moreover, the LMG demonstrates excellent elasticity and structural stability, maintaining its structural integrity even under significant geometric deformations during fatigue tests (only 4.7 % residual strain and 5.5 % stress reduction). The long-range lamellar structure endows LMG with superior EMI shielding, thermal insulation and mechanical properties, providing a reliable design strategy for achieving structural orderliness and multifunctional applications in aerogels.

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牺牲辅助远程片层MXene/rGO气凝胶，用于电磁干扰屏蔽和隔热

电磁保护和热保护对精密仪器非常重要。具有有序结构取向的气凝胶在电磁波能量的耗散和热隔离方面具有巨大的潜力。然而，在气凝胶中实现对长时间序列的精确控制仍然是一个重大挑战，阻碍了它们的进一步发展和多功能应用。为此，采用牺牲辅助双向冷冻铸造法制备了具有长程片层结构的MXene/rGO气凝胶（LMG）。LMG具有优异的电磁干扰屏蔽性能，绝对屏蔽效能（SSE/t）为14933.3 dB cm2 g−1。高度有序的层有效地阻碍了相邻层之间的热传导，导热系数仅为30.8 mW m−1 K−1。此外，LMG表现出优异的弹性和结构稳定性，即使在疲劳试验中显著的几何变形下（只有4.7%的残余应变和5.5%的应力减小），也能保持其结构完整性。长程层状结构赋予LMG优越的电磁干扰屏蔽、隔热和机械性能，为实现结构有序和在气凝胶中的多功能应用提供了可靠的设计策略。

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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.