Interfacical polarization dominant rGO aerogel decorated with molybdenum sulfide towards lightweight and high-performance electromagnetic wave absorber

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon Pub Date : 2024-10-22 DOI:10.1016/j.carbon.2024.119738

Qiuyu Li , Liyuan Liu , Hideo Kimura , Ahmed M. Fallatah , Hua Qiu , Gaber A.M. Mersal , Ruanna Ren , Abdulraheem SA Almalki , Nannan Wu , Xueqin Sun , Wei Du , Zhanhu Guo , Chuanxin Hou

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Abstract

Lightweight reduced graphene oxide aerogel (rGO) has obtained enormous attention as microwave absorber due to anisotropic characteristics in their structure and electromagnetic parameters. However, the controllable preparation of reduced graphene oxide (rGO) aerogels with tailored multidimensional structure with broadened effective absorption bandwidth is a thorny difficulty. In this paper, rGO aerogel decorated with molybdenum sulfide (rGO/MoS₂) with three-dimensional (3D) layered porous structure were synthesized by a two-step hydrothermal method. The unique three-dimensional layered porous structure of graphene aerogel not only effectively avoids the stacking of graphene flake layers, but also provides space for the loading of MoS₂ nanosheets. The introduction of MoS₂ nanosheets compensates for the imbalance of impedance matching caused by graphene due to the excessive conductivity, and the folded MoS₂ nanosheets are uniformly loaded on the graphene lamellae, which is conducive to generate multiple reflections and scattering of electromagnetic waves. Besides, the construction of heterogeneous interfaces strengthens the interfacial polarizability of the composites. As a result, excellent electromagnetic wave attenuation properties were obtained for rGO/MoS₂, and the effective absorption bandwidth (EAB) reached 6.56 GHz at 2.1 mm. In addition, the radar cross section (RCS) simulation results further demonstrate the dissipation capability of the composite in practical application scenarios. This paper provides a new idea for the design of lightweight EM wave absorbing materials with broad absorption bandwidth.

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用硫化钼装饰的间极化主导型 rGO 气凝胶实现轻质高性能电磁波吸收器

轻质还原氧化石墨烯气凝胶（rGO）因其结构和电磁参数的各向异性，作为微波吸收剂受到了广泛关注。然而，如何可控地制备具有定制多维结构、有效吸收带宽更宽的还原氧化石墨烯气凝胶却是一个棘手的难题。本文采用两步水热法合成了具有三维（3D）层状多孔结构的硫化钼装饰 rGO 气凝胶（rGO/MoS2）。石墨烯气凝胶独特的三维分层多孔结构不仅有效地避免了石墨烯薄片层的堆叠，而且为MoS2纳米片的负载提供了空间。MoS2 纳米片的引入弥补了石墨烯因导电率过高而导致的阻抗匹配失衡，折叠的 MoS2 纳米片均匀地负载在石墨烯薄片上，有利于产生电磁波的多次反射和散射。此外，异质界面的构建增强了复合材料的界面极化性。因此，rGO/MoS2 获得了优异的电磁波衰减特性，在 2.1 毫米处的有效吸收带宽（EAB）达到了 6.56 GHz。此外，雷达截面（RCS）模拟结果进一步证明了该复合材料在实际应用场景中的耗散能力。本文为设计具有宽吸收带宽的轻质电磁波吸收材料提供了新思路。

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

Carbon 工程技术-材料科学：综合

CiteScore

20.80

自引率

7.30%

发文量

审稿时长

23 days

期刊介绍： The journal Carbon is an international multidisciplinary forum for communicating scientific advances in the field of carbon materials. It reports new findings related to the formation, structure, properties, behaviors, and technological applications of carbons. Carbons are a broad class of ordered or disordered solid phases composed primarily of elemental carbon, including but not limited to carbon black, carbon fibers and filaments, carbon nanotubes, diamond and diamond-like carbon, fullerenes, glassy carbon, graphite, graphene, graphene-oxide, porous carbons, pyrolytic carbon, and other sp2 and non-sp2 hybridized carbon systems. Carbon is the companion title to the open access journal Carbon Trends. Relevant application areas for carbon materials include biology and medicine, catalysis, electronic, optoelectronic, spintronic, high-frequency, and photonic devices, energy storage and conversion systems, environmental applications and water treatment, smart materials and systems, and structural and thermal applications.