Abstract
Design of multi-functional microwave absorption materials with strong dissipation ability is a practical approach to address the current issue of electromagnetic radiation pollution.Herein,based on the ex-change bias interaction between ferromagnetic and anti-ferromagnetic interfaces,a series of absorbers composed of the porous biochar loaded with ferromagnetic/anti-ferromagnetic NiCO2O4/CoO were suc-cessfully prepared via a fairly simple process of one-step calcination.By regulating the calcination tem-perature,the pore size and porosity of porous carbon,morphology of loaded NPs as well as the elec-tromagnetic response property and impedance matching characteristic in such composites can be mod-ulated.The porous biochar/NiCO2O4/CoO composite prepared under 350 ℃ possesses a remarkable elec-tromagnetic absorption reflection loss(RL)of-48.41 dB at 9.12 GHz with 2.5 mm thickness,and the effective absorption bandwidth(EAB)of 4.32 GHz with 2.2 mm thickness is located at X band,this is owing to the strong coupling effect of multiple dielectric polarizations,magnetic resonances,and eddy current consumption under matched impedance.In addition,the microwave absorbing patch prepared with this composite exhibits a well-hydrophobic property for self-cleaning function,and the large exten-sibility with substantial breaking strength endows its practical usage as a flexible absorber.
基金项目
Surface Project of Local Development in Science and Technology Guided by Central Government(2021ZYD0041)
国家自然科学基金(52377026)
国家自然科学基金(52301192)
山东省自然科学基金(ZR2019YQ24)
Shandong Taishan Scholars Young Expert Program(tsqn202103057)
Qingchuang Talents Induction Program of Shandong Higher Education Institution(Research and Innovation Team of Structural-Fun()
NETL
NSTL
万方数据