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Robust microwave absorption in silver-cobalt hollow microspheres with heterointerfaces and electric-magnetic synergism:Towards achieving lightweight and absorption-type microwave shielding composites

查看全文 作　　者：Dian [1]Yang;Jun-Ru [1]Tao;Yi [1]Yang;Qian-Ming [1]He;Ming [1]Wang 高影响力作者 机构地区：[1]Chongqing Key Laboratory of Soft-Matter Material Chemistry and Function Manufacturing,School of Chemistry and Chemical Engineering,Southwest University,Chongqing 400715,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2023年第7期,共11页高影响力期刊 基　　金：This work was financially supported by the National Natural Science Foundation of China(No.52173264);the Natural Science Foundation Project of Chongqing(No.cstc2020jcyj-msxmX0401). 摘　　要：Lightweight and high-efficiency microwave shielding materials based on high absorption loss are the hotspot of current research.Herein,the silver-cobalt bimetallic hollow microspheres(Ag-Co-HM)with low reflection loss and broadband absorption efficiency were fabricated and then used to construct bimetallic hollow structures in polydimethylsiloxane/carbon nanotube composites(PDMS/CNT)to obtain the lightweight and absorption-type microwave shielding composites.The microwave absorption of Ag-Co-HM and the microwave shielding effectiveness(SE T)of the PDMS/CNT/Ag-Co-HM composites was evaluated and discussed.The Ag-Co-HM with a molar ratio(Co/Ag)of 2.07 exhibited a low reflection loss as-46.6 dB at a thickness of 2.6 mm,and an effective absorption bandwidth of 8.40 GHz.The SE T of the PDMS/CNT composites was greatly enhanced by the incorporation of the Ag-Co-HM.Furthermore,the absorption coefficient(A)was also improved by adding the Ag-Co-HM and was much higher than the reflection coefficient.The composites exhibited absorption-type microwave shielding composites.For example,the average microwave SE T of 59.4 dB and A value of 0.78 are achieved in the PDMS/CNT/Ag-Co-HM composites containing 5 wt%CNTs and 10 wt%Ag-Co-HMs,which are much higher than the cor-responding values of 33.7 dB and 0.63 in the PDMS/CNT composites with only 5 wt%CNTs.In addition,the hollow structure of Ag-Co-HM endows the PDMS/CNT/Ag-Co-HM composites to have a low density. 关 键 词：Microwave shielding Absorption loss LIGHTWEIGHT POLYDIMETHYLSILOXANE Carbon nanotube
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