Multifunctional high-compaction MWCNT/GNP hybrid buckypaper: Unraveling superior conductivity for broadband EMI shielding and instantaneous Joule heating applications

IF 7.7 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2025-07-24 DOI:10.1016/j.coco.2025.102545

Jaehoo Kim , Gahyun Woo , Mingyu Kim , Ki Hong Park , Jong Hyuk Park , Tae Hee Han , Hae-Seok Lee , Ung Lee , Jaewoo Kim

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Abstract

Buckypaper (BP), a self-supporting film of carbon nanotubes (CNTs), is a promising material for flexible electronics, energy storage, and electromagnetic interference (EMI) shielding. However, its practical utility is hindered by CNT aggregation and limited structural integrity. This study introduces hybrid BP, fabricated by integrating multi-walled carbon nanotubes (MWCNTs) with graphene nanoplatelets (GNPs) via vacuum filtration, resulting in a uniformly dispersed, interconnected architecture. The influence of varying GNP content on structure and properties is systematically explored, with a particular emphasis on EMI shielding and Joule heating. At 75 wt% GNP, the hybrid BP achieves optimal performance, demonstrating exceptional electrical (683 % improvement) and thermal (190 % improvement) conductivity, remarkable mechanical flexibility, and enhanced EMI shielding (126 %) and Joule heating (203 %) compared to pure MWCNT BP. These properties are attributed to a compact, multidimensional conductive network formed by well-dispersed MWCNTs. EMI shielding effectiveness is meticulously evaluated across an extensive frequency spectrum, including X-, Ka-, V-, and W-bands, with reflection, absorption, and transmission mechanisms rigorously analyzed through physical and mathematical frameworks. The hybrid BP also exhibits superior Joule heating with stable spatial, temporal, and responsive characteristics. These findings underscore the multifunctional potential of hybrid BP for advanced electronics, thermal management, and EMI shielding solutions.

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多功能高压实MWCNT/GNP混合纸：为宽带EMI屏蔽和瞬时焦耳加热应用提供卓越的导电性

巴克纸（BP）是一种碳纳米管（CNTs）薄膜，是一种很有前途的柔性电子、储能和电磁干扰（EMI）屏蔽材料。然而，碳纳米管聚集和有限的结构完整性阻碍了其实际应用。本研究介绍了混合BP，通过真空过滤将多壁碳纳米管（MWCNTs）与石墨烯纳米片（GNPs）集成，形成均匀分散、相互连接的结构。不同GNP含量对结构和性能的影响进行了系统的探索，特别强调了电磁干扰屏蔽和焦耳加热。在75wt % GNP下，混合BP实现了最佳性能，与纯MWCNT BP相比，表现出卓越的电导率（提高683%）和热导电性（提高190%），卓越的机械灵活性，增强的EMI屏蔽（126%）和焦耳加热（203%）。这些特性归因于由分散良好的MWCNTs形成的紧凑、多维导电网络。在广泛的频谱范围内，包括X， Ka， V和w波段，通过物理和数学框架严格分析反射，吸收和传输机制，对EMI屏蔽效果进行了精心评估。混合BP还表现出优越的焦耳加热性能，具有稳定的空间、时间和响应特性。这些发现强调了混合BP在先进电子、热管理和EMI屏蔽解决方案方面的多功能潜力。

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来源期刊

Composites Communications Materials Science-Ceramics and Composites

CiteScore

12.10

自引率

10.00%

发文量

340

审稿时长

36 days

期刊介绍： Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.