首页|Interface engineering by redox reaction on ferrites to prepare efficient electromagnetic wave absorbers

Interface engineering by redox reaction on ferrites to prepare efficient electromagnetic wave absorbers

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Preparation of electromagnetic(EM)wave-absorbing composites by interface engineering has been the main strategy to obtain high-performance absorbers.However,the conventional strategy is tedious and time-consuming,which hinders the scalable synthesis of stable EM wave-absorbing composites.Herein,interface engineering by a redox reaction between transition metal elements in Co-based spinel fer-rites was employed to create EM wave-absorbing composites to solve the above problem.Among serial MCo2O4(M=Ni,Cu,and Zn)spinel ferrites,redox reactions during synthesis only occurred between Cu and Co elements,thus leading to the presence of multiple crystal phases on final samples.With the aid of increased polyethylene glycol(PEG)molecular weight(MW),more heterogenous interfaces between CuO and CuCo2O4 phases as well as induced crystal defects were generated.Under synergetic interface engineering by means of PEG-assisted redox reaction,interfacial polarization,and defect-induced polar-ization loss were markedly enhanced on a CuCo2O4-based sample that was prepared with PEG MW of 100 K.The effective absorption bandwidth of the corresponding sample could reach 6.48 GHz(11.52-18 GHz)with a thickness of 2.28 mm.In short,this work provides a novel strategy for designing EM wave absorbing composites by interface engineering through redox reaction instead of the conventional composition coupling process.

Electromagnetic wave absorptionRedox reactionInterfacial engineeringSpinel ferrite

Ming Qin、Qianxu Ye、Xiaoming Cai、Jinming Cai、Hongjing Wu

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Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China

Faculty of Mechanical and Electrical Engineering Kunming University of Science and Technology,Kunming 650500,China

Southwest United Graduate School,Kunming 650092,China

MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary,School of Physical Science and Technology,Northwestern Polytechnical University,Xi'an 710072,China

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National Natural Science Foundation of ChinaYunnan Fundamental Research ProjectsMajor Basic Research Project of Science and Technology of YunnanYunnan Innovation Team of Graphene Mechanism Research and Application IndustrializationGraphene Application and Engineering Research Center of Education Department of Yunnan Providence

22372074202101AV070008202302AG050007202305AS350017KKPP202351001

2024

10.1016/j.jmst.2023.10.065

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.188(21)
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