材料科学
反射损耗
生物炭
微波食品加热
电介质
复合数
兴奋剂
光电子学
吸收(声学)
化学工程
复合材料
热解
电信
计算机科学
工程类
作者
Zhiwang Hao,Jimei Liu,Xinliang He,Yubo Meng,Xin Lu,Dong Liu,Xiaobin Wang,Chao Bian
出处
期刊:Social Science Research Network
[Social Science Electronic Publishing]
日期:2022-01-01
摘要
Although the rapid advances of wireless technologies and electronic devices largely improve the quality of life, the omnipresent electromagnetic (EM) pollution increases the risk of exposure to EM radiation. Developing high-efficiency absorbers with rational structure and wideband characteristic is of great significance to eliminate radiation pollution in military or civil fields. Herein, Enteromorpha prolifera derived biochar (EPB) with undulant structure activated by potassium carbonate has been prepared as the supporter to anchor the Fe doped ZIF-67 dodecahedrons. In addition, the EPB with abundant functional groups would provide proper surface and multiple polarization induced by the active sites and thereby contribute to target optimized impedance matching degree and strong energy dissipation. As a result, the as-prepared composite absorbers achieve remarkable EM absorption properties with the minimum reflection loss of -53.9 dB and qualified bandwidth of 4.8 GHz at 2.0 mm attributed to the synergistic magnetic-dielectric dual-loss. Elaborate compositional and structural characterizations indicate the as-prepared composite absorbers have large specific area, and numerous polarization centers, such as Fe heteroatoms, which would make full use of waste biomass as lightweight and broadband high-performance EM absorbing materials.
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