Targeted repairing micro-cracks of graphite foam by graphene oxide: heat dissipation and electromagnetic shielding

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon Pub Date : 2025-05-27 DOI:10.1016/j.carbon.2025.120468

Shi-Long Ma , Xing Guo , Ruo-Han Niu , Ai-Li Wei , Zong-Lin Yi , Wang-Gang Zhang , Li-Jing Xie , Fang-Yuan Su , Hui Jia , Yi-Ming Liu , Cheng-Meng Chen

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引用次数: 0

Abstract

Graphite foams (GF) have received high attention in the electromagnetic protection and heat dissipation due to its excellent electrical and thermal conductivity. However, micro-cracks of GF skeleton are easily formed due to thermal stresses originated from uneven temperature distribution during carbonization, which seriously weaken its performance. In this work, a novel strategy for targeting repairing GF micro-cracks by adsorption of graphene oxide (GO) is proposed. GO with abundant oxygen functional groups is accurately adsorbed on the crack sites of GF ligaments based on hydrogen bond and capillary force. Meanwhile, GO lamellae act as a template to induced ordered arrangement of graphite crystallites to increase the graphitization degree to 98.5 % during the graphitization. This strategy is conducive to the rapid propagation of phonons, which enables the thermal conductivity of GF as high as 109 W m⁻¹ K⁻¹. Moreover, a high electrical conductivity 5.26 × 10⁴ S m⁻¹ of the GF is also obtained, which enhances electromagnetic shielding effectiveness reaches 100 dB in the X-band (8.2–12.4 GHz). This work provides a feasible pathway for the application of electromagnetic protection and thermal management in high-power precision electronic devices.

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氧化石墨烯定向修复泡沫石墨微裂纹：散热和电磁屏蔽

石墨泡沫材料由于其优良的导电性和导热性，在电磁防护和散热方面受到了广泛的关注。然而，碳化过程中由于温度分布不均匀而产生的热应力，使GF骨架容易形成微裂纹，严重削弱了其性能。本文提出了一种利用氧化石墨烯吸附修复GF微裂纹的新方法。具有丰富氧官能团的氧化石墨烯基于氢键和毛细力被准确吸附在GF韧带的断裂部位。同时，氧化石墨烯薄片作为模板诱导石墨晶体有序排列，石墨化程度提高到98.5%。这种策略有利于声子的快速传播，使得GF的导热系数高达109 W m−1 K−1。此外，GF具有5.26 × 104 S m−1的高导电性，在x波段（8.2-12.4 GHz）的电磁屏蔽效能达到100 dB。本工作为电磁保护和热管理在大功率精密电子器件中的应用提供了一条可行的途径。

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.