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Anionic mof derived Bimetallic Ni_(x)Co_(y)@Nano-porous carbon composites toward strong and efficient electromagnetic wave absorption

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Journal of Materiomics 2022年第4期8卷 852-862页

作者： Fan Zhang Yefu Chen Yujie Ren Qi Zheng Lianjun Wang Wan Jiang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China Engineering Research Center of Advanced Glasses Manufacturing Technology Ministry of EducationDonghua UniversityShanghai201620China Institute of Functional Materials Donghua UniversityShanghai201620China

Metal-organic frameworks (mofs) derived metallic nanoparticles embedded nano-porous carbon (NPC)composites have shown to be promising microwave absorbing materials. Although mof precursors withdiverse compositions and morphologies have been extensively investigated, anionic mofs are rarelyexplored for this utility. In addition to the metal sites and ligands on the mof framework, the guestcounter-cations in the void provide supplementary parameters to tune the capability of microwaveabsorption. Herein, we applied an anionic NixCoy-mof featuring N-rich ligands and hierarchical porousstructures as a precursor for microwave absorption. The obtained dielectric-magnetic Ni_(x)Co_(y)@NPCcomposites with rich N dopants and multiple hetero-interfaces promote the microwave attenuationcapability through enhanced dipole/interfacial relaxation. The synergistic effects of magnetic loss andconduction loss induced by metallic nanoparticles (NPs) and porous graphitic layers further facilitate themicrowave dissipation. More significantly, impedance matching can be effectively improved by tuningthe Co/Ni amount in the precursors to realize the modulation of electromagnetic parameters. Conse-quently, Ni@NPC exhibits the optimal electromagnetic wave (EMW) absorption with minimum reflectionloss of 66 dB at only 2 mm and broad effective absorption band covering 4.56 GHz at a thin thickness of2.07 mm, making this material promising absorber for EMW elimination.

关键词： Anionic mofs mof-derived carbon composites N-rich ligands Dielectric loss Magnetic loss Electromagnetic wave absorption

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Metal-organic framework-derive d carbon-base d composites for electromagnetic wave absorption:Dimension design and morphology regulation

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Journal of Materials Science & Technology 2023年第1期132卷 223-251页

作者： Yujie Ren Xin Wang Jiaxin Ma Qi Zheng Lianjun Wang Wan Jiang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials and College of Materials Science and Engineering Donghua UniversityShanghai 201620China Institute of Functional Materials Donghua UniversityShanghai 201620China Engineering Research Center of Advanced Glasses Manufacturing Technology Ministry of EducationDonghua UniversityShanghai 201620China

Developing highly efficient microwave absorbing materials(MAMs)to ameliorate the electromagnetic(EM)response and facilitate energy absorption is crucial in both the civil and military industries.Metal-organic framework(mof)derived nanoporous carbon composites have emerged as advanced MAMs ow-ing to their rich porosity,tunable compositions,facile functionalization,and morphology diversity.To-gether with the flourishing development of composition-tuning strategy,the rational dimension design and elaborate control over the architectures have also evolved into an effective approach to regulating their EM properties.Herein,we provide a comprehensive review of the recent advances in using di-mension and morphology modulation to adjust the microwave attenuation capacities for mof-derived carbon composites.The underlying design rules and unique advantages for the MAMs of various dimen-sions were discussed with the selection of representative work,providing general concepts and insight on how to efficiently tune the morphologies.Accordingly,the fundamental dimension-morphology-function relationship was also elucidated.Finally,the challenges and perspectives of dimension design and mor-phology control over mof-derived MAMs were also presented.

关键词： mof-derived carbon composites Electromagnetic microwave absorption Dimension design Morphology regulation

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