Abstract
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.
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