Regulating the electromagnetic balance of materials by electron transfer for enhanced electromagnetic wave absorption

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外文摘要：The fact that single dielectric loss materials have disadvantages of excessive conductivities and impedance mismatches has given rise to a large effort to develop effective strategies to fabricate electromagnetic wave(EMW)absorbing materials comprised of components that bring about a balance between dielec-tric loss and magnetic loss.Moreover,little is known about the essential features that regulate EMW absorption propensities.This study focused on the development of a new EMW absorbing material and gaining information about factors that govern EMW absorption abilities.The materials at the center of the effort are light weight and porous cobalt sulfonated phthalocyanine-reduced graphene oxide(CoSPc-rGO)aerogels that were synthesized by using a simple hydrothermal method followed by freeze-drying.The properties of these materials that contribute to the electromagnetic balance between dielectric and magnetic loss were elucidated by first formulating a reasonable hypothesis about how the relative orien-tation of the components in CoSPc-rGO govern p-conjugation and electron transfer from rGO to CoSPc,which is proposed to be a key factor contributing to the regulation of the electromagnetic balance.Po-larization relaxation process of materials was analyzed in detail using a variety of approaches including theoretical calculation,spectroscopic measurements,and experimental and simulation studies.The fabri-cated CoSPc-rGO aerogels that contain an ultra-low content of 4％were found to exhibit an extraordinary microwave absorption performance associated with a strong reflection loss of-53.23 dB and a broad ef-fective absorption bandwidth of 8.04 GHz.The results of this study should provide an effective guide for new designs of composite materials for EMW absorption.

外文关键词：

Microwave absorptionPolarization relaxationElectromagnetic balanceElectrons transferDFT calculation

作者：

Kunyao Cao、Weiping Ye、Yue Zhang、Lewei Shen、Rui Zhao、Weidong Xue、Xiaoyu Yang

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作者单位：

School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 610054,China

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,and International School of Materials Science & Engineering,and School of Materials Science & Engineering,Wuhan University of Technology,Wuhan 430070,China

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & Shenzhen Research Institute & Joint Laboratory for Marine Advanced Materials,Shenzhen 518063,China

School of Engineering and Applied Sciences,Harvard University,Cambridge,Massachusetts 021

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出版年：

2024

DOI：

10.1016/j.jmst.2023.12.069

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCD

影响因子：0.657

ISSN：1005-0302

年,卷(期)：2024.195(28)