文献类型：期刊文献

英文题名：The Developed Wave Cancellation Theory Contributing to Understand Wave Absorption Mechanism of ZIF Derivatives with Controllable Electromagnetic Parameters

作者：Zhou, Yukang[1];He, Peng[1];Ma, Wenjun[1];Zuo, Peiyuan[1];Xu, Jian[1];Tang, Chuanhao[1];Zhuang, Qixin[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：2024

卷号：20

期号：2

外文期刊名：SMALL

收录：;EI(收录号：20233614675905);WOS:【SCI-EXPANDED(收录号:WOS:001057445300001)】；

基金：This work was supported by the National Natural Science Foundation of China (52073091, 22171086), Shanghai Pujiang Program (22PJ1402500), Natural Science Foundation of Shanghai (20ZR1414600), and the Key Laboratory of Advanced Polymer Materials of Shanghai.

语种：英文

外文关键词：conduction loss; dipole polarization; electromagnetic wave absorbers; wave cancellation theory

摘要：How to better understand the influence of electromagnetic parameters on the absorbing properties of electromagnetic wave absorbers (EMAs) is an essential prerequisite for further synthesis and development of high-performance EMAs. In this work, an improved wave cancellation theory is used as a guiding principle to prepare N-doped carbon-coated cobalt nanoparticles (Co@NC) using ZIF-8@ZIF-67 as the precursor, thus enabling controllable electromagnetic parameters by regulating the conduction loss and dipole polarization ability. The Co@NC generated by pyrolysis at 700 degrees C under H-2 atmosphere presents an optimized absorption performance. Benefiting from developed wave cancellation theory, the thickness of the film can be accurately adjusted so that the difference between the amplitude of the reflected and transmitted electromagnetic waves is only 0.001 and the phase difference is 180.05 degrees, thus achieving a minimum reflection loss (RLmin(dB)) of -64.0 dB. Meanwhile, a maximum effective absorption bandwidth of 5.4 GHz is achieved simultaneously attributing to its most suitable electromagnetic parameters. Accordingly, the current research based on wave cancellation theory significantly contributes to understand the relationships between electromagnetic parameters and wave absorption properties, therefore providing a theoretical insight into the further development of high-performance EMAs.