文献类型：期刊文献

英文题名：Hierarchical and Orderly Surface Conductive Networks in Yolk-Shell Fe3O4@C@Co/N-Doped C Microspheres for Enhanced Microwave Absorption

作者：He, Peng[1];Ma, Wenjun[1];Xu, Jian[1];Wang, Yizhe[1];Cui, Zhong-Kai[2];Wei, Jie[1];Zuo, Peiyuan[1];Liu, Xiaoyun[1];Zhuang, Qixin[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Adv Polymer Mat Shanghai, Shanghai 200237, Peoples R China;[2]Southern Med Univ, Sch Basic Med Sci, Guangzhou 510515, Peoples R China

年份：2023

卷号：19

期号：40

外文期刊名：SMALL

收录：;EI(收录号：20232314180979);WOS:【SCI-EXPANDED(收录号:WOS:000998806200001)】；

基金：Acknowledgements This work was supported by the National Natural Science Foundation of China (52073091, 22171086) and the Shanghai Pujiang Program (22PJ1402500).

语种：英文

外文关键词：conduction loss; impedance matching; microwave absorption; synergistic attenuation

摘要：Constructing the adjustable surface conductive networks is an innovation that can achieve a balance between enhanced attenuation and impedance mismatch according to the microwave absorption mechanism. However, the traditional design strategies remain significant challenges in terms of rational selection and controlled growth of conductive components. Herein, a hierarchical construction strategy and quantitative construction technique are employed to introduce conductive metal-organic frameworks (MOFs) derivatives in the classic yolk-shell structure composed of electromagnetic components and the cavity for remarkable optimized performance. Specifically, the surface conductive networks obtained by carbonized ZIF-67 quantitative construction, together with the Fe3O4 magnetic core and dielectric carbon layer linked by the cavity, achieve the cooperative enhancement of impedance matching optimization and synergistic attenuation in the Fe3O4@C@Co/N-Doped C (FCCNC) absorber. This interesting design is further verified by experimental results and simulation calculations. The products FCCNC-2 yield a distinguished minimum reflection loss of -66.39 dB and an exceptional effective absorption bandwidth of 6.49 GHz, indicating that moderate conduction excited via hierarchical and quantitative design can maximize the absorption capability. Furthermore, the proposed versatile methodology of surface assembly paves a new avenue to maximize beneficial conduction effect and manipulate microwave attenuation in MOFs derivatives.