Dual strategy of A-site ion substitution and self-assembled MoS_(2) wrapping to boost permittivity for reinforced microwave absorption performance  

作　　者：Ailing Feng Di Lan Jinkun Liu Guanglei Wu Zirui Jia 

机构地区：[1]Institute of Physics&Optoelectronics Technology,Baoji University of Arts and Sciences,Baoji 721016,China [2]School of Materials Science and Engineering,Hubei University of Automotive Technology,Shiyan 442002,China [3]Institute of Materials for Energy and Environment,State Key Laboratory of Bio-Fibers and Eco-Textiles,College of Materials Science and Engineering,Qingdao University,Qingdao 266071,China [4]College of Chemistry and Chemical Engineering,Qingdao University,Qingdao 266071,China

出　　处：《Journal of Materials Science & Technology》2024年第13期1-11,共11页材料科学技术（英文版）

基　　金：National Natural Science Foundation of China(No.52301192);Natural Science Foundation of Shandong Province(No.ZR2019YQ24);Taishan Scholars and Young Experts Program of Shandong Province(No.tsqn202103057);Qingchuang Talents Induction Program of Shandong Higher Education Institution(Research and Innovation Team of Structural Functional Polymer Composites);Special Financial of Shandong Province(Structural Design of High-efficiency Electromag-netic Wave-absorbing Composite Materials and Construction of Shandong Provincial Talent Teams).

摘　　要：With the rapid development of electronic technology,how to effectively eliminate electromagnetic pollu-tion has become a serious problem.Perovskite oxides have shown great potential in the field of electro-magnetic wave absorption due to their unique structure and excellent physicochemical properties.Herein,by rationally manipulating the A-site ion substitution strategy,the theoretically directed doping of Sr ions into La ionic sites was utilized and the layered MoS_(2) was loaded by the hydrothermal process to modify its surface.Consequently,the introduced polarization phenomenon improved the dielectric performance of the perovskite oxides,achieving a collaborative dielectric/magnetic loss mechanism.Accordingly,the prepared La0.7Sr0.3FeO3(LSFO)/MoS_(2) as coating filler in the epoxy resin coating system can obtain the minimum reflection loss of-67.09 dB at 1.9 mm and the maximum effective absorption bandwidth of 7.28 GHz at 2.3 mm.More importantly,it also exhibits excellent absorption performance for multi-band electromagnetic waves,covering a wide range of specified frequency bands.It provides inspiration for ex-ploring novel perovskite oxide-based electromagnetic wave absorbing coatings and broadens the choice of ideal candidate materials for designing highly efficient,multi-band absorbers to cope with sophisticated electromagnetic environments.

关 键 词：Perovskite oxides A-site ion substitution MULTI-BAND Electromagnetic wave absorbing coating 

分 类 号：TQ427.26[化学工程]