Alkali and ion exchange co-modulation strategies to design magnetic-dielectric synergistic nano-absorbers for tailoring microwave absorption  

作　　者：Yue Wu Shujuan Tan Taichen Zhang Ming Zhou Gang Fang Guangbin Ji 

机构地区：[1]School of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China

出　　处：《Nano Research》2023年第7期8522-8532,共11页纳米研究（英文版）

基　　金：We are thankful for financial support from the National Nature Science Foundation of China(Nos.51971111 and 52273247);the Fund of Prospective Layout of Scientific Research for NUAA(Nanjing University of Aeronautics and Astronautics)(No.ILA220461A22);the facilities in the Center for Microscopy and Analysis at Nanjing University of Aeronautics and Astronautics.

摘　　要：Alkali and Co^(2+)co-modulation has seldom been investigated as a prospective strategy to achieve high-efficient microwave absorbing(MA)materials.In this work,a new alkali and Co ion exchange co-modulation strategy was first reported,leading to broadband MA capacity through simultaneous manipulating multiple factors,such as composition,micromorphology,and heterogeneous interface.And enhancements in impedance matching and magnetic-dielectric loss were synergistically realized.Consequently,the optimized FeCo alloy@porous carbon(FPC)nanocomposite with the alkali regulation delivered an effective absorption bandwidth(EAB)of 6.72 GHz,making it the merely single FeCo-based metal-organic framework derived FPC absorber with a low filler content of 15 wt.%.Interestingly,the nanocomposites by ion exchange strategy realized the switchable“on/off”states on electromagnetic response.Furthermore,the radar cross-section(RCS)reduction value of the products reached 25.6 dB·m^(2) under the incident angle of 0°.In brief,this work not only offers the special role of alkali and Co^(2+)co-modulation in composition regulation,structure design,and MA capacity,but also provides a reliable strategy to develop smart nano-absorbers to cope with electromagnetic pollution issues.

关 键 词：microwave absorption alkali regulation ion exchange strategy switchable on/off mode nano-absorbers 

分 类 号：TB383[一般工业技术—材料科学与工程]