Nitrogen-doped reduced graphene oxide/copper ferrite@polypyrrole composite aerogels for broadband electromagnetic wave absorption

IF 13.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2025-06-11 DOI:10.1016/j.cej.2025.164748

Kunlong Yun, Ruiwen Shu, Xue Yi, Konghu Tian

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引用次数: 0

Abstract

Electromagnetic radiation pollution is becoming increasingly serious due to the widespread use of electronic communication equipment. Therefore, it is urgent to research and develop new high-performance electromagnetic wave (EMW) absorbing materials. In this work, nitrogen-doped reduced graphene oxide/copper ferrite@polypyrrole (NRGO/CuFe₂O₄@PPy) ternary composite aerogels with low bulk density (13.18–18.05 mg/cm³) and unique hierarchical structures were prepared by a three-step method of solvothermal reaction, in-situ oxidative polymerization and hydrothermal self-assembly. The special core-shell structure of the CuFe₂O₄@PPy composites produces a large number of heterointerfaces. Furthermore, nitrogen doping leads to the creation of numerous C − N dipoles. These factors jointly enhanced the EMW absorbing capacity of NRGO/CuFe₂O₄@PPy composite aerogels. When the addition amount of CuFe₂O₄@PPy was 15 mg and the filling ratio was 8 wt%, the optimal reflection loss reached −45.11 dB at a thickness of 3.42 mm and the maximum effective absorption bandwidth was 8.08 GHz at 2.72 mm. Meanwhile, this ternary composite aerogel exhibited the best radar cross section (RCS) reduction performance, achieving the maximum value of 38.62 dB∙m². In addition, the potential EMW dissipation mechanism was revealed. Therefore, the obtained NRGO/CuFe₂O₄@PPy ternary composite aerogels have great potential as lightweight and high-efficient EMW absorbers.

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宽带电磁波吸收用氮掺杂还原氧化石墨烯/铜ferrite@polypyrrole复合气凝胶

由于电子通信设备的广泛使用，电磁辐射污染日益严重。因此，研究和开发新型高性能电磁波吸波材料迫在眉睫。本研究采用溶剂热反应、原位氧化聚合和水热自组装三步法制备了低体积密度（13.18-18.05 mg/cm3）、具有独特层叠结构的氮掺杂还原氧化石墨烯/铜ferrite@polypyrrole （NRGO/CuFe2O4@PPy）三元复合气凝胶。CuFe2O4@PPy复合材料特殊的核壳结构产生了大量的异质界面。此外，氮掺杂导致大量的C−N偶极子的产生。这些因素共同增强了NRGO/CuFe2O4@PPy复合气凝胶对EMW的吸收能力。当CuFe2O4@PPy添加量为15 mg，填充率为8 wt%时，在3.42 mm厚度处的最佳反射损耗为−45.11 dB，在2.72 mm处的最大有效吸收带宽为8.08 GHz。同时，该三元复合气凝胶具有最佳的雷达横截面（RCS）消减性能，最大可达38.62 dB∙m2。此外，还揭示了潜在的EMW耗散机制。因此，所制得的NRGO/CuFe2O4@PPy三元复合气凝胶作为轻质、高效的EMW吸收剂具有很大的潜力。

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.