Pomegranate-like ATO/SiO_(2)microspheres for efficient microwave absorption in wide temperature spectrum  

作　　者：Zhiyang Jiang Yanjie Gao Zhihao Pan Miaomiao Zhang Jianhui Guo Jingwei Zhang Chunhong Gong 

机构地区：[1]Institute of Functional Polymer Composites,College of Chemistry and Molecular Sciences,Henan University,Kaifeng 475004,China [2]National&Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials,Henan University,Kaifeng 475004,China

出　　处：《Journal of Materials Science & Technology》2024年第7期195-203,共9页材料科学技术（英文版）

基　　金：the financial support of the National Nature Science Foundation of China(No.U1704253).

摘　　要：High-performance microwave-absorbing materials(MAMs)should meet both impedance matching and attenuation performance.Commonly,it is hard to maintain excellent microwave absorption(MA)per-formance at an elevated temperature because the reliance on impedance matching and dielectric loss about temperature mutually restricts.In this work,the pomegranate-like antimony-doped tin dioxide(ATO)/silica dioxide(SiO_(2))spheres were fabricated via a simple spray drying process.When the spheres were used as functional units and dispersed in the matrix,the corresponding composites exhibit an out-standing anti-reflection effect on microwaves.Moreover,the unique pomegranate-like structure of the ATO/SiO_(2)spheres provides both the effective local eddy current and abundant heterogeneous interface,which therefore contribute harvest enhanced dielectric relaxation and improved absorption performance when compared with that of the corresponding ATO/SiO_(2)composition.As a result,the maximum re-flection loss of the ATO/SiO_(2)spheres composites can reach-47.8 dB at 9.7 GHz with a thickness of 1.8 mm,while the reflection loss could reach-47.3 dB at 573 K and the effective absorption bandwidth is 2.4 GHz.This work reveals the importance of local eddy current loss in optimizing the electromagnetic wave(EMW)absorption performance and impedance matching,providing novel guidance on designing advanced high-temperature MAMs.

关 键 词：ATO/SiO_(2)microspheres Local eddy current Impedance matching Dielectric loss Microwave absorption 

分 类 号：TB34[一般工业技术—材料科学与工程]