材料科学
阻抗匹配
反射损耗
电介质
复合材料
复合数
宽带
电阻抗
介电损耗
吸收(声学)
光电子学
电信
计算机科学
电气工程
工程类
作者
Zhongjing Shen,Huili Yang,Chongbo Liu,Enwei Guo,Siyi Huang,Zhiqiang Xiong
出处
期刊:Carbon
[Elsevier]
日期:2021-11-01
卷期号:185: 464-476
被引量:65
标识
DOI:10.1016/j.carbon.2021.09.041
摘要
The broadband electromagnetic wave absorption (EMWA) property of a material is governed by its electromagnetic impedance matching, but an effective regulation strategy to enhance the impedance matching is still lacking in the existing literature. A reasonable component composition and micro-structural design are very important for EMWA materials. In this work, through in situ pyrolysis of two polymetallic metal-organic frameworks (MOFs): CoMn-MOF and FeCoMn-MOF, Co and FeCo are subtly introduced into [email protected]orous carbon (NPC) composite to improve the permeability and the impedance matching, which leads to broadband EMWA performance. Co/[email protected] has an effective absorption bandwidth (EAB; reflection loss ≤ −10 dB) of 5.44 GHz from 12.56 to 18 GHz at 1.58 mm-thickness. FeCo/[email protected] has an EAB of 7.72 GHz from 10.28 to 18 GHz at 1.63 mm-thickness, and when the thickness is 2.37 mm, the reflection loss reaches −54.07 dB. The excellent broadband EMWA performances of the corn-like composites are attributed to the conductive network of carbon matrix, the optimized dielectric constant provided by MnO, the dramatically enhanced permeability due to the dispersed Co and FeCo, and the multi-polarization loss among multiple components. Overall, this work provides an effective strategy to improve the impedance matching and broaden the EAB of absorbers.
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