Abstract
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.
基金项目
National Natural Science Foundation of China(22372074)
Yunnan Fundamental Research Projects(202101AV070008)
Major Basic Research Project of Science and Technology of Yunnan(202302AG050007)
Yunnan Innovation Team of Graphene Mechanism Research and Application Industrialization(202305AS350017)
Graphene Application and Engineering Research Center of Education Department of Yunnan Providence(KKPP202351001)
NETL
NSTL
万方数据