writer：An Liu, Xingshen Xu, Hua Qiu, Hua Guo, Mukun He, Ze Yu, Yali Zhang*, Junwei Gu*
keywords：bioinspired construction strategy, electromagnetic interference shielding, marimo-like hollow fillers, pressure-sensing performance
source：期刊
specific source：InfoMat
Issue time：2025年

An Liu, Xingshen Xu, Hua Qiu, Hua Guo, Mukun He, Ze Yu, Yali Zhang*, Junwei Gu*. Bioinspired hollow heterostructure fillers for enhanced electromagnetic interference shielding in polyimide aerogels. InfoMat, 2025, 7(11): e70060. 2024IF=22.3.（1区材料科学Top期刊）

https://onlinelibrary.wiley.com/doi/10.1002/inf2.70060

Abstract

Heterostructure fillers are crucial for enhancing the electromagnetic interference (EMI) shielding performance of composites, and the core lies in the regulation of their morphology. Inspired by the radial structures on marimo surfaces during growth, we propose a bioinspired heterostructure assembly strategy to fabricate novel marimo-like hollow spherical reduced graphene oxide (hs-rGO)@nickel-catalyzed nitrogen-doped carbon nanotubes (Ni-NCNTs) and their corresponding polyimide aerogels. Benefiting from the synergistic design of multilevel porous architectures formed by the hollow microspheres in combination with the aerogel matrix, as well as radially aligned Ni-NCNTs epitaxially grown on hs-rGO surfaces, the resulting aerogels exhibit exceptional EMI shielding effectiveness, reaching up to 68 dB. Finite element simulations further elucidate the shielding mechanisms. Additionally, these aerogels exhibit rapid, durable pressure-sensing performance due to their excellent resilience and conductivity. The multifunctional combination of high-efficiency EMI shielding and mechanical sensing highlights their promising potential in next-generation intelligent electronics, aerospace systems, and advanced communication technologies.

异质结构填料对于增强复合材料的电磁屏蔽性能至关重要，其核心在于对其形貌的调控。受海藻球生长过程中表面呈放射状结构启发，我们提出了一种仿生异质结构组装策略，制备了新型类海藻球状的空心球状还原氧化石墨烯（hs-rGO）@镍催化氮掺杂碳纳米管（Ni-NCNTs）及其聚酰亚胺气凝胶。得益于气凝胶和中空微球的多级孔结构，以及hs-rGO表面外延生长的径向排列的Ni-NCNTs，所制备的气凝胶展现出优异的电磁屏蔽效能，最高可达68 dB。有限元模拟进一步阐明了其屏蔽机制。此外，由于其出色的弹性和导电性，该气凝胶还展现出灵敏、耐用的压力传感性能。这种兼具高电磁屏蔽与压力传感功能的复合气凝胶在未来智能电子设备、航空航天领域和先进通信技术具有广泛的应用潜力。