Lightweight flower-like nitrogen-doped carbon materials achieve efficient electromagnetic wave absorption

IF 5.8 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2025-06-23 DOI:10.1007/s42823-025-00937-z

Xianfei Xie, Sheng Wang, Danqiang Huang, Jianfeng Dai, Qing Wang

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引用次数: 0

Abstract

Structural design and element doping are the research hotspots in the preparation of lightweight absorbers with high absorption performance and low filling rate. This study employs different temperature carbonization and etching techniques to prepare the structure of hollow nitrogen-doped carbon flowers (HNC) and evaluate their microwave absorption performance. At an ultra-low filler loading of 5 wt.%, the microwave absorption intensity of HNC-800 remains stable at -50 dB with a thickness of 3.2 mm. It is noteworthy that the HNC-800 achieved the broadest effective absorption frequency band at a matching thickness of 2 mm, with a bandwidth of 5.36 GHz (ranging from 12.4 to 17.76 GHz). Such remarkable broadband and reflection loss performance can be attributed to the synergistic effects of the hollow porous network structure, interface polarization, and dipole relaxation mechanisms. More significantly, the reduction of the radar cross-section (RCS) amounts to as much as 31.67 dB m², and it has been attested to possess excellent adsorption efficacy in practical application scenarios. HNC-800, as an absorbing material, holds potential for broad application prospects.

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轻质花状氮掺杂碳材料实现高效电磁波吸收

结构设计和元素掺杂是制备高吸收性能、低填充率轻质吸收剂的研究热点。本研究采用不同温度的碳化和蚀刻技术制备了空心氮掺杂碳花（HNC）的结构，并对其微波吸收性能进行了评价。在5 wt.%的超低填充量下，HNC-800的微波吸收强度稳定在-50 dB，厚度为3.2 mm。值得注意的是，HNC-800在匹配厚度为2mm时实现了最宽的有效吸收频带，带宽为5.36 GHz （12.4 ~ 17.76 GHz）。这种卓越的宽带和反射损耗性能可归因于空心多孔网络结构、界面极化和偶极子弛豫机制的协同作用。更显著的是，降低雷达截面（RCS）达31.67 dB m2，在实际应用场景中已被证明具有优异的吸附效果。HNC-800作为吸波材料，具有广阔的应用前景。

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 Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.