Anionic MOF derived Bimetallic Ni_(x)Co_(y)@Nano-porous carbon composites toward strong and efficient electromagnetic wave absorption
作者机构：State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai201620China Engineering Research Center of Advanced Glasses Manufacturing TechnologyMinistry of EducationDonghua UniversityShanghai201620China Institute of Functional MaterialsDonghua UniversityShanghai201620China
出 版 物：《Journal of Materiomics》 (无机材料学学报（英文）)
年 卷 期：2022年第8卷第4期
页 面：852-862页
核心收录：
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学]
基 金：This work was supported by Fundamental Research Funds for the Central Universities(No.2232020A-02) Shanghai Pujiang Pro-gram(No.19PJ1400200) Fundamental Research Funds for the Central Universities(No.2232019G-07) National Natural Science Foundation of China(No.51871053,No.91963204).
主 题：Anionic MOFs MOF-Derived carbon composites N-rich ligands Dielectric loss Magnetic loss Electromagnetic wave absorption
摘 要：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.
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