Rational construction of MOFs-derived two-dimensional core-shell structured Co@C/Fe composites as ultrathin and high-performance microwave absorption materials

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Science Pub Date : 2025-01-18 DOI:10.1007/s10853-024-10585-9

Chaoqun Ge, Liuying Wang, Lixin Wang, Gu Liu, Kejun Xu, Long Wang, Bin Wang, Mengzhou Chen, Weichao Wang, Jie Huang

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Abstract

Synergistic design of rational heterogeneous interface structure and magnetic components can effectively regulate and enhance the polarization loss and magnetic loss capacity of metal-organic frameworks (MOFs) derived magnetic carbon-based composites, thereby improving their microwave absorption performance with low thickness and broad absorption bandwidth. In this work, a novel two-dimensional core-shell structured Co@C/Fe composites were fabricated through the deposition of Fe on bimetallic flaky Co/Zn MOFs, followed by thermal decomposition. Results revealed that the pyrolysis temperature has a significant impact on the composition, morphology, magnetic properties, and microwave absorption performance of the as-obtained composites. After pyrolyzing at 700 °C, the flaky core-shell structured Co@C/Fe composites exhibit excellent microwave absorption performance. Specifically, the minimum reflection loss can reach -86.15 dB with an ultrathin thickness of 1.38 mm, and the effective absorption bandwidth can extend to 5.1 GHz at a low thickness of 1.51 mm. The introduction of the core-shell structure and the magnetic Fe shell played critical roles on the enhanced microwave absorption performance. It is believed that this work may offer a new paradigm and approach for the preparation of ultrathin and high-performance MOFs-derived microwave absorption materials, thereby expanding the application scope of MOFs.

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mofs衍生二维核壳结构Co@C/Fe超薄高性能微波吸收材料的合理构建

通过合理的非均相界面结构和磁性组分的协同设计，可以有效调节和增强金属-有机骨架（MOFs）衍生磁性碳基复合材料的极化损耗和磁损耗能力，从而提高其低厚度、宽吸收带宽的微波吸收性能。本文通过在Co/Zn双金属片状mof上沉积Fe，并进行热分解，制备了一种新型的二维核壳结构Co@C/Fe复合材料。结果表明，热解温度对复合材料的组成、形貌、磁性能和微波吸收性能有显著影响。经700℃热解后，片状核壳结构Co@C/Fe复合材料具有优异的微波吸收性能。其中，在1.38 mm的超薄厚度下，最小反射损耗可达-86.15 dB，在1.51 mm的低厚度下，有效吸收带宽可扩展到5.1 GHz。核壳结构和磁性铁壳的引入对微波吸收性能的增强起着至关重要的作用。相信本研究为超薄高性能MOFs衍生微波吸收材料的制备提供了新的范式和途径，从而扩大了MOFs的应用范围。图形抽象

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来源期刊

Journal of Materials Science 工程技术-材料科学：综合

CiteScore

7.90

自引率

4.40%

发文量

1297

审稿时长

2.4 months

期刊介绍： The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.