材料科学
微波食品加热
反射损耗
复合材料
复合数
吸收(声学)
羰基铁
微观结构
宽带
光学
计算机科学
电信
物理
作者
Ge Chen,Liuying Wang,Lin Gu,Long Wang,Kejun Xu,Weichao Wang
标识
DOI:10.1016/j.jallcom.2021.161097
摘要
Construction of thin thickness and broadband microwave absorption materials (MAMs) is challenging but important. One important and relatively successful strategy involves the reduction of quarter-wavelength resonance thickness by increasing permittivity (εr) and permeability (μr). In this study, MOFs-derived core-shell structured flaky carbonyl iron/[email protected] (FCI/[email protected]) composites were synthesized via self-polymerization and in-situ pyrolysis to enhance εr. The effects of Co content in the porous carbon shell on the microstructure and electromagnetic performance of the FCI/[email protected] composites were investigated. The FCI/[email protected] composite with a Co-to-Zn molar ratio of 1:0 and 3:1 in its precursor and 70 wt% of filler exhibited excellent microwave absorption performance. The effective absorption bandwidth (EAB, corresponding to a reflection loss of less than −10 dB) of FCI/[email protected] reached 5.7 GHz (12.3–18 GHz) with a thickness of 1.28 mm, while the EAB of FCI/[email protected]/1 reached 5.2 GHz (12.8–18 GHz) with a thickness of 1.19 mm, and both samples demonstrated broadband absorption in the Ku band. Thus, core-shell structured FCI/[email protected] composites can be used as thin broadband MAMs in the Ku band. Furthermore, this work not only provides a simple method for constructing FCI-based core-shell structured MAMs, but also offers a novel strategy for reducing thickness while maintaining good microwave absorption performance.
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