Hierarchically porous N-doped dual-carbon coupled Co5.47N composite with tunable electromagnetic shielding and absorption properties

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2024-11-19 DOI:10.1016/j.jallcom.2024.177670

Zhen Qin, Yumei Ren, Shuai Yang, Peichen Li, Zhongyi Wang, Desheng Feng, Dongwei Xu, Yanjun Zheng, Kun Xu, Xiaoqin Guo, Biao Zhao

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引用次数: 0

Abstract

Electromagnetic interference (EMI) and pollution issues are becoming increasingly prominent. It is of great scientific significance and practical value to develop lightweight, efficient and tunable electromagnetic wave (EMW) attenuating materials. Herein, a three-dimensional (3D) hierarchical porous N-doped dual-carbon (glucose-derived carbon and reduced graphene oxide (rGO)) coupled Co_5.47N (Co_5.47N@HNCF) composite was reasonably designed and prepared via simple and low-cost methods, which exhibited excellent electromagnetic attenuation properties. By appropriately adjusting the filling amount of Co_5.47N@HNCF, tunable EMI shielding and EMW absorption properties could be achieved. At high filling amount (40 wt%), the highly conductive Co_5.47N@HNCF composite had excellent EMI shielding effectiveness (EMI SE) in X-band (8.2~12.4 GHz), with a maximum total electromagnetic shielding effectiveness (SE_T) of 81.6 dB (average EMI SE of 76.8 dB) and a thickness of 2 mm. Particularly, when the thickness is only 0.8 mm, the SE_T could reach 32 dB. While at low filling amount (15 wt%), Co_5.47N@HNCF composite with suitable impedance matching showed remarkable EMW absorption performance, exhibiting high values of reflection loss (RL) of -45.86 dB in 2~18 GHz. The high-performance EMW attenuation in Co_5.47N@HNCF could be ascribed to the construction of stable 3D conductive dual-carbon frameworks and Co_5.47N nanoparticles with abundant N vacancies. The dielectric and magnetic components of the system acted synergistically, possessing abundant heterogeneous interfaces and defects, which could induce various loss modes such as multiple reflections/scattering, conductive loss, magnetic loss and polarization loss to synergistically dissipate EMW. Therefore, this study endeavors to give an effective strategy for the preparation of low-cost, lightweight, and highly efficient tunable EMW attenuation materials.

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具有可调电磁屏蔽和吸收特性的分层多孔 N 掺杂双碳耦合 Co5.47N 复合材料

电磁干扰（EMI）和污染问题日益突出。开发轻质、高效、可调的电磁波衰减材料具有重要的科学意义和实用价值。本文通过简单、低成本的方法，合理设计并制备了一种三维（3D）多孔掺杂 N 双碳（葡萄糖衍生碳和还原氧化石墨烯（rGO））耦合 Co5.47N （Co5.47N@HNCF）复合材料，该材料具有优异的电磁衰减性能。通过适当调整 Co5.47N@HNCF 的填充量，可实现可调的电磁干扰屏蔽和电磁波吸收特性。在高填充量（40 wt%）条件下，高导电 Co5.47N@HNCF 复合材料在 X 波段（8.2~12.4 GHz）具有优异的电磁干扰屏蔽效果（EMI SE），最大总电磁屏蔽效果（SET）为 81.6 dB（平均 EMI SE 为 76.8 dB），厚度为 2 mm。特别是当厚度仅为 0.8 毫米时，SET 可达到 32 dB。而在低填充量（15 wt%）条件下，具有适当阻抗匹配的 Co5.47N@HNCF 复合材料表现出显著的电磁波吸收性能，在 2~18 GHz 范围内的反射损耗（RL）值高达 -45.86 dB。Co5.47N@HNCF 中的高性能电磁波衰减可归因于构建了稳定的三维导电双碳框架和含有大量 N 空位的 Co5.47N 纳米粒子。该体系的介电和磁性成分协同作用，具有丰富的异质界面和缺陷，可诱导多种损耗模式，如多重反射/散射、导电损耗、磁性损耗和极化损耗，从而协同消散电磁波。因此，本研究致力于为制备低成本、轻质、高效的可调电磁波衰减材料提供一种有效的策略。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.