文献类型：期刊文献

英文题名：Air-induced dual-cavity yolk-shell architecture in lightweight hollow Fe3O4@air@Co/C nanocomposites enabling high-efficiency electromagnetic wave absorption

作者：Wang, Yizhe[1,2];Li, Siyue[2];Yuan, Ye[2];Zhuang, Qixin[2];Liu, Xiaoyun[2];Zuo, Peiyuan[2]

机构：[1]Qinghai Univ, State Key Lab Plateau Ecol & Agr, Xining 810016, Qinghai, Peoples R China;[2]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, Shanghai 200237, Peoples R China

年份：2026

卷号：1079

外文期刊名：JOURNAL OF ALLOYS AND COMPOUNDS

收录：;EI(收录号：20262921105800);Scopus(收录号：2-s2.0-105044519386);WOS:【SCI-EXPANDED(收录号:WOS:001825478800001)】；

基金：This work was supported by the National Natural Science Foundation of China (52573077, 52303083, 52373073, 22171086), the Shanghai Rising-Star Program (24QA2701800), the Fundamental Research Funds for the Central Universities (No. JKD01261701) and the Fundamental Research Funds for the Central Universitie (JKD01251501).

语种：英文

外文关键词：Protected etching; Air-induced dual-cavity yolk-shell structures; Hollow Fe 3O 4@air@Co/C; Electromagnetic wave absorption

摘要：The rational design of yolk-shell structured materials with integrated dielectric-magnetic synergy has emerged as a critical strategy for developing lightweight and high-performance electromagnetic wave (EMW) absorbers. Comparing to the conventional yolk-shell structures that typically rely on single cavity configuration, the airinduced dual-cavity yolk-shell structures offer both lightweight absorber design and substantial enhancements in interfacial polarization over wide frequency range. To this end, this study proposes a novel "coating-protected etching-high temperature carbonization" strategy to successfully construct an air-induced dual-cavity yolk-shell hollow Fe3O4@air@Co/C composite absorber. The unique nanostructure possesses two independent cavities: one within the inner hollow Fe3O4 core, and another between the inner Fe3O4 core and the Co/C shell. The dual cavities not only significantly reduce the material density but also optimize the impedance matching. Importantly, the synergistic effects of the air-induced dual-cavity interfaces (Fe3O4-air and Co/C-air) amplify multiinterfacial polarization and improve the absorption ability via combined magnetic and dielectric loss mechanisms. Experimental results demonstrate that the optimized absorber achieves a remarkable reflection loss of -67.21 dB and a maximum effective absorption bandwidth (EAB) of 5.12 GHz (12.08-17.20 GHz) at an ultra-thin thickness of 2.0 mm and a low filler loading of 20 wt%. Collectively, our findings provide a new design approach for constructing high-efficiency, lightweight EMW absorption materials.