文献类型：期刊文献

英文题名：Efficient microwave traps with markedly enhanced interfacial polarization and impedance matching enabled by dual-shelled, dual-cavity magnetic@dielectric hollow nanospheres

作者：Hua, Jiasong[1];Ma, Wenjun[1];Liu, Xiaoyun[1];Zhuang, Qixin[1];Wu, Zeyang[1];Huang, Huang[1];Lin, Shaoliang[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Adv Polymer Mat Shanghai, Shanghai 200237, Peoples R China

年份：2020

卷号：8

期号：46

起止页码：16489

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY C

收录：;EI(收录号：20205109652121);WOS:【SCI-EXPANDED(收录号:WOS:000597117200022)】；

基金：This work was financially supported by the National Natural Science Foundation of China (51773060, and 51573045), the International Collaboration Research Program of Science and the Technology Commission of Shanghai (16520722000).

语种：英文

外文关键词：Dielectric devices - Electromagnetic pulse - Nanospheres - Shells (structures) - Impedance matching (electric) - Dielectric materials - Electromagnetic shielding - Titanium dioxide - Dielectric losses - Microwaves - Polarization

摘要：The ability to create robust microwave absorbing materials renders efficient protection of electromagnetic radiation. The combination of magnetic and dielectric losses has emerged as an appealing strategy to yield high-performance microwave absorbers. In this context, dual-shelled hollow nanospheres composed of magnetic Fe3O4 inner shell and dielectric TiO2 outer shell (denoted DS-Fe3O4@TiO2-HNs) are, for the first time, crafted by rationally introducing a sacrificial intermediate shell. Notably, such unique dual-shelled nanostructures with a relatively large hollow interior within the Fe3O4 inner shell and an additional cavity between the Fe3O4 inner shell and the TiO2 outer shell (i.e., dual-cavity) manifest an advantageous attribute for producing lightweight absorbers. Intriguingly, the reflection loss (RL) of -60.17 decibel (dB) at 10 GHz and the effective bandwidth of microwave absorption of 10.5 GHz at RL <= -10 dB, representing 90% absorption, are achieved for DS-Fe3O4@TiO2-HNs with a thickness of only 1.8 mm. The outstanding microwave absorption performance of DS-Fe3O4@TiO2-HNs can be attributed to the synergy of efficient trapping of the incident wave, markedly enhanced interfacial polarization, and greatly improved impedance matching. As such, judiciously crafted uniform dual-shelled, dual-cavity nanospheres possessing optimal magnetic and dielectric losses hold great promise as highly efficient lightweight microwave absorbers for use in electromagnetic interference shielding, including mobile communication devices, AM radio, and radar, among other areas.