Construction of ZnFe2O4/C/CG composites with low-frequency and broadband electromagnetic wave absorption

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-06-01 DOI:10.1016/j.ceramint.2025.02.199

Chuanlei Zhu , Shengtao Gao , Yuanchun Zhang

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引用次数: 0

Abstract

Coal gangue (CG) is considered to have the potential to prepare carbon based electromagnetic wave (EMW) absorption due to its low cost, porous structure, and rich composition. However, improving the EMW absorption efficiency of CG at low frequencies remains a major challenge. In this study, hollow ZnFe₂O₄/C microspheres were loaded onto the surface of acid washed CG, and starch was used as a supplementary carbon source to successfully prepare ZnFe₂O₄/C/CG (ZFC) composite materials. CG not only improves the dispersibility of hollow ZnFe₂O₄/C microspheres, but also constructs magnetic-carbon heterointerfaces during the growth and high-temperature carbonization process of hollow ZnFe₂O₄/C microspheres, forming crystal defects. ZFC absorbers exhibit excellent low-frequency EMW absorption performance at suitable carbonization temperatures. When the thickness is 4.8 mm, the minimum reflection loss of ZFC reaches −31.9 dB at a frequency of 6.74 GHz. When the thickness is 5.0 mm, the effective absorption bandwidth of ZFC reaches 3.12 GHz (4.88–8.00 GHz), covering 78 % of the C-band. Therefore, by suppressing magnetic agglomeration and constructing heterogeneous interfaces, a new design strategy is provided for the preparation of low-frequency EMW absorption.

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低频宽带电磁波吸收ZnFe2O4/C/CG复合材料的构建

煤矸石（CG）由于其成本低、结构多孔、成分丰富等优点，被认为具有制备碳基电磁波（EMW）吸收材料的潜力。然而，提高CG在低频的EMW吸收效率仍然是一个主要的挑战。本研究将空心ZnFe2O4/C微球加载到酸洗CG表面，并以淀粉作为补充碳源，成功制备了ZnFe2O4/C/CG （ZFC）复合材料。CG不仅提高了空心ZnFe2O4/C微球的分散性，而且在空心ZnFe2O4/C微球的生长和高温碳化过程中构建了磁碳异质界面，形成晶体缺陷。在合适的碳化温度下，ZFC吸收剂表现出优异的低频EMW吸收性能。当厚度为4.8 mm时，在6.74 GHz频率下，ZFC的最小反射损耗为- 31.9 dB。当厚度为5.0 mm时，ZFC的有效吸收带宽达到3.12 GHz (4.88 ~ 8.00 GHz)，覆盖了78%的c波段。因此，通过抑制磁团聚和构建异质界面，为制备低频EMW吸收体提供了新的设计策略。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.