反射损耗
材料科学
钴
吸收(声学)
复合材料
复合数
阻抗匹配
纳米颗粒
多孔性
电导率
煅烧
散射
介电损耗
电阻抗
纳米技术
光电子学
光学
电介质
冶金
生物化学
化学
催化作用
物理
物理化学
电气工程
工程类
作者
Guorui Yang,Bo Wen,Yifan Wang,Xinyu Zhou,Xiaofeng Liu,Shujiang Ding
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2023-02-20
卷期号:34 (18): 185704-185704
被引量:8
标识
DOI:10.1088/1361-6528/acb655
摘要
Abstract Electromagnetic wave (EM) absorption materials with multi-loss mechanisms and optimized impedance matching have attracted considerable attention as a means to combat the ever-increasing electromagnetic pollution. Molybdenum carbide (Mo 2 C) with outstanding environmental stability and high conductivity is becoming popular as EM absorption materials. Herein, the CoMoO 4 @ZIF-67 precursor was synthesized by an in situ sacrificial template method, followed by calcining to synthesize porous Mo 2 C@cobalt/carbon (Mo 2 C@Co/C) composites. The homogeneously dispersed Mo 2 C and Co nanoparticles as well as the porous structures resulted from the novel in situ fabrication strategy could generate abundant interfaces and induce effective multi-loss mechanisms including polarization loss, conductivity loss, magnetic loss, and so on. The as-prepared optimal composite (Mo 2 C@Co/C-10) demonstrates superior electromagnetic (EM) wave absorption performance with a maximum reflection loss value of −37.9 dB at the matching thickness of 2.3 mm, and the effective absorption bandwidth (EAB) of 5.52 GHz was realized at 1.9 mm. The excellent EM wave absorption properties can be attributed to the good impedance matching, synergistic effects among different loss mechanisms, multiple reflection and scattering. This work not only developed an effective ternary EM absorption materials of Mo 2 C@Co/C, but also propose a facile in situ strategy to fabricate more highly- dispersed mecarbide-basedased materials.
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