材料科学
金属
二进制数
电介质
宽带
阻抗匹配
硫化物
组分(热力学)
吸收(声学)
光电子学
电阻抗
化学工程
复合材料
计算机科学
电信
冶金
物理
电气工程
工程类
热力学
算术
数学
作者
Jiaolong Liu,Limin Zhang,Duyang Zang,Hongjing Wu
标识
DOI:10.1002/adfm.202105018
摘要
Abstract The development of multicomponent dielectric composites has become a mainstream approach for obtaining excellent electromagnetic wave (EMW) absorbers. However, conventional component introduction is often performed blindly and based only on semiempirical rules, lacking precise modulation of components, interfaces, and defects during the reaction process. Herein, a competitive reaction mechanism is proposed for the first time, in which not only the metal ion concentration but also its characteristic are two feasible parameters to control the components, interfaces, and defects to tailor the EMW absorption performances of Cu‐based binary metal sulfides. The appropriate heterogeneous interfaces and components and the abundant defects can synergistically benefit the EMW absorption capacity by forming perfect impedance matching and multiple dielectric polarizations. As a result, combined with these advantages, an effective absorption band) of 6.80 GHz (6.3–13.1 GHz) is achieved at 2.80 mm for Cu–Co binary metal sulfide, showing the sole middle‐frequency broadband absorption of reported sulfide‐based absorbers to date. Other Cu‐based binary metal sulfides deliver different EMW absorption behaviors. This work breaks through the limitation of traditional component design, opening up a novel methodology for designing multicomponent composites beyond sulfides with broadband absorption.
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