Dual-gradient Mo2C-decorated rGO aerogels for enhanced electromagnetic wave absorption

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2024-11-20 DOI:10.1016/j.jallcom.2024.177683

Jie Zhang, Zekui Zhang, Lu Liu, Han Zhang, Tian Xing, Kexun Li, Ruihua Zhao, Jianping Du

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Abstract

The lightweight, strong absorption, non-resin, and high chemical and thermal stability of electromagnetic wave absorption materials used in space vehicles are required in the harsh space environments. Herein, a light weight and effective microwave-absorbing material is constructed by synthesizing carbide-modified reduced graphene oxide (rGO) aerogels, gradient design and carbonization. The as-prepared aerogel material consists of molybdenum carbide (MC) and rGO, and displays hollow structures with multi-wall rGO layers. The MC structure in the MC/rGO aerogel is regulated by controlling the amount of Mo source, and the dual gradient structure composed of MC/rGOmaterial is designed and optimized by CST Microwave Studio. Compared with MC/rGO aerogel, the dual-gradient MC/rGO (DG-MC/rGO) aerogel exhibits superior impedance matching and significantly enhanced microwave absorption performance. The minimum reflection loss (-62.4 dB) is reduced by 64.6%, and the effective absorption bandwidth (5.7 GHz) is increased by over 35.7% at a thickness of 2.2 mm. The remarkable improvement of microwave absorption is attributed to the synergy effect of well-dispersed molybdenum carbide nanoparticles and the components/structures gradients of DG-MC/rGO material. This novel lightweight material has promising applications in electromagnetic wave absorption fields.

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用于增强电磁波吸收的双梯度 Mo2C 涂层 rGO 气凝胶

在恶劣的太空环境中，要求航天器使用的电磁波吸收材料重量轻、吸收强、无树脂、化学和热稳定性高。本文通过合成碳化物修饰的还原氧化石墨烯（rGO）气凝胶、梯度设计和碳化，构建了一种轻质、高效的微波吸收材料。制备的气凝胶材料由碳化钼（MC）和还原氧化石墨烯（rGO）组成，呈现出多壁还原氧化石墨烯层的中空结构。通过控制钼源的量来调节 MC/rGO 气凝胶中的 MC 结构，并利用 CST Microwave Studio 设计和优化了 MC/rGO 材料组成的双梯度结构。与 MC/rGO 气凝胶相比，双梯度 MC/rGO 气凝胶（DG-MC/rGO）具有更优越的阻抗匹配性，微波吸收性能显著提高。在厚度为 2.2 毫米时，最小反射损耗（-62.4 dB）降低了 64.6%，有效吸收带宽（5.7 GHz）增加了 35.7%。微波吸收率的明显改善归功于分散良好的碳化钼纳米粒子和 DG-MC/rGO 材料的成分/结构梯度的协同效应。这种新型轻质材料在电磁波吸收领域具有广阔的应用前景。

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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.