Magnetic-dielectric balance in chain-like CoNi@C heterojunction with enhanced electromagnetic wave absorption

IF 6.5 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2025-04-28 DOI:10.1016/j.coco.2025.102424

Xiaofeng Shi , Lei Wang , Lin Chen , Qiaoling Xu , Zhengting Du , Deqing Shi , Zhenfa Zi , Renchao Che

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引用次数: 0

Abstract

Chain-like magnetic-dielectric composites have become an ideal choice for electromagnetic (EM) wave absorption materials due to their excellent component adjustment and structural optimization. Here, the chain-like CoNi@C heterojunction was obtained via multi-step reaction combining the solvothermal reaction, polymerization reaction, and annealing treatment. Magnetic chain-like CoNi alloy was firstly synthesized under application magnetic field, where offered the polymerization surfaces for the dopamine monomer. Then, as-prepared CoNi@PDA composites were undergoing the annealing treatment at N₂ atmosphere to obtain the chain-like CoNi@C heterojunction. The EM parameters and impedance match properties of the CoNi@C composites can be efficiently regulated via tunning the carbon shell. Combining with the magnetic-dielectric balance and synergy loss absorption, chain-like CoNi@C heterojunction exhibited outstanding EM wave performance. Optimized CoNi@C-7 heterojunction exhibited the minimum reflection loss (RL_min) value can reach to −50.3 dB at 11.92 GHz when the thickness is 1.95 mm and the effective absorption bandwidth (EAB) can up to 4.16 GHz from 13.84 GHz to 18 GHz at only 1.5 mm thickness. Therefore, the chain-like magnetic-dielectric CoNi@C composites provided a new design ideal to fabricate the EM wave absorption materials.

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电磁波吸收增强的链状CoNi@C异质结的磁介电平衡

链状磁介电复合材料因其优异的成分调节和结构优化性能而成为电磁波吸收材料的理想选择。本文通过溶剂热反应、聚合反应和退火处理相结合的多步反应得到了链状CoNi@C异质结。首次在应用磁场下合成了类磁链CoNi合金，为多巴胺单体提供了聚合表面。然后，将制备好的CoNi@PDA复合材料在N2气氛下进行退火处理，得到链状CoNi@C异质结。通过调整碳壳，可以有效地调节CoNi@C复合材料的电磁参数和阻抗匹配性能。结合磁介电平衡和协同损耗吸收，链状CoNi@C异质结具有优异的电磁波性能。优化后的CoNi@C-7异质结在厚度为1.95 mm时，在11.92 GHz时的最小反射损耗（RLmin）值可达- 50.3 dB，在厚度仅为1.5 mm时，有效吸收带宽（EAB）可在13.84 GHz至18 GHz范围内达到4.16 GHz。因此，链状磁介质CoNi@C复合材料为制造电磁波吸收材料提供了一种新的设计理想。

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

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.