Construction of Co_(2)NiO_(4)@MnCo_(2)O_(4.5)nanoparticles with multiple hetero-interfaces for enhanced electromagnetic wave absorption  

作　　者：Yi Zhang Shujuan Tan Zhuoting Zhou Xiaomeng Guan Yu Liao Chen Li Guangbin Ji 

机构地区：[1]College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing,210016,China [2]School of Electronic Science and Engineering,Nanjing University,Nanjing,210093,China

出　　处：《Particuology》2023年第10期86-97,共12页颗粒学报（英文版）

基　　金：We are thankful to the financial support from the National Natural Science Foundation of China(grant No.51971111);Innovation Project of Nanjing University of Aeronautics and Astronautics(grant No.xcxjh20210604)。

摘　　要：Nanocomposites with heterogeneous structures and magneto-electric synergistic losses have broad prospects for improving electromagnetic wave(EMW)absorption performance.In this study,we synthesized Co_(2)NiO_(4)@MnCo_(2)O_(4.5)nanoparticles with abundant hetero-interfaces and multiple magnetoelectric loss mechanisms by a facile hydrothermal method.The excess 0.5 oxygen atoms in MnCo_(2)O_(4.5) produce more vacancies and contribute to the enhancement of electrical conductivity.Sequential nanoneedle clusters facilitate multiple reflections and absorption of EMW in the materials,which are accompanied by an abundance of heterogeneous interfaces to improve the dielectric loss.The Co_(2)NiO_(4)@MnCo_(2)O_(4.5)composites showed a minimum reflection loss(RLmin)of30.01 dB and a superior effective absorption bandwidth(EAB)of 6.12 GHz(11.88 GHze18 GHz)at a thickness of 2.00 mm.Computer Simulation Technology(CST)revealed that the obtained particles show very low radar crosssection(RCS)values and almost full coverage angles.The maximum reduction of RCS at vertical incidence reaches 19.98 dB m2.The Co_(2)NiO_(4)@MnCo_(2)O_(4.5)nanoparticles exhibit outstanding radar attenuation properties,which can effectively inhibit the reflection and scattering of EMW.Therefore,the prepared Co_(2)NiO_(4)@MnCo_(2)O_(4.5)absorbers have great application potential in the field of EMW absorption.

关 键 词：Electromagnetic wave absorption Effective absorption bandwidth NANOPARTICLE Magneto-electric synergistic loss Hetero-interfaces 

分 类 号：TB33[一般工业技术—材料科学与工程]