Sub-Nanometer Fe Clusters Confined in Carbon Nanocages for Boosting Dielectric Polarization and Broadband Electromagnetic Wave Absorption

Tong Gao; Rongzhi Zhao; Yixing LiZhenying ZhuChenglong HuLianze JiJian ZhangXuefeng Zhang

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Sub-Nanometer Fe Clusters Confined in Carbon Nanocages for Boosting Dielectric Polarization and Broadband Electromagnetic Wave Absorption

机译：Sub-Nanometer Fe Clusters Confined in Carbon Nanocages for Boosting Dielectric Polarization and Broadband Electromagnetic Wave Absorption

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Compositing dielectric and magnetic components have been proven effectivein optimizing electromagnetic (EM) wave absorption, in which the dielectricloss capacity can be reinforced by the polarization effects of hetero-substitutions.Here, the dielectric polarization through the energy transformationbetween the relatively complex permeability and permittivity in nitrogendopedcarbon nanocages (NCNs) with sub-nanometer Fe clusters is furtherboosted. As a transition state between single Fe atoms and Fe_3O_4 nanoparticleshetero-substitutions, these subnanometer Fe clusters confined in NCNscan be achieved by carbonizing FePc@ZIF-8 composites at 900 ℃. Benefittingfrom their unique structures, an enhanced dielectric loss tangent of 1.57is obtained at 10 GHz, which is 3.0 and 1.6 times higher than those of singleFe atoms and Fe_3O_4 nanoparticles hetero-substitutions, respectively. Furthermore,the minimum reflection loss can reach ?64.75 dB at 7.1 GHz (2.7 mm)and the effective absorption bandwidth is 6.2 GHz (11.8–18 GHz, coveringthe full P-band) at 1.7 mm. The present study provides intrinsic insight intothe dielectric polarization behaviors in subnanometer hetero-substitutions,inspiring the design of high-performance EM absorption materials.

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来源
《Advanced functional materials》 |2022年第31期|2204370.1-2204370.10|共10页
作者
Tong Gao; Rongzhi Zhao; Yixing LiZhenying ZhuChenglong HuLianze JiJian ZhangXuefeng Zhang;
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作者单位

Key Laboratory for Anisotropy and Texture of Materials (MOE)School of Materials Science and EngineeringNortheastern UniversityShenyang 110819, P. R. China,Institute of Advanced Magnetic MaterialsCollege of Materials and Environmental EngineeringHangzhou D;

Institute of Advanced Magnetic MaterialsCollege of Materials and Environmental EngineeringHangzhou Dianzi UniversityHangzhou 310012, P. R. China;

Key Laboratory for Anisotropy and Texture of Materials (MOE)School of Materials Science and EngineeringNortheastern UniversityShenyang 110819, P. R. China;

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正文语种英语
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carbon nanocages; metal-organic frameworks; microwave absorption; subnanometer clusters; synergistic polarization;

Sub-Nanometer Fe Clusters Confined in Carbon Nanocages for Boosting Dielectric Polarization and Broadband Electromagnetic Wave Absorption

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