摘要
为了获得高性能复合吸波材料,以Co-MOF为前驱体,采用离子交换及高温煅烧两步法制备钴镍合金@碳纳米复合材料(CoNi@C)。利用扫描电子显微镜、透射电子显微镜,以及X射线衍射仪等仪器对CoNi@C的成分、结构和形貌进行表征。运用矢量网络分析仪对复合材料的电磁参数进行了系统测试以深入研究不同煅烧温度对复合材料吸波性能的影响。结果表明:制备的CoNi@C为多孔的核壳结构,其中CoNi合金纳米粒子均匀地镶嵌在碳壳内。当煅烧温度为600℃时,CoNi@C复合材料具有优异的吸波性能,CoNi@C-600石蜡介质中的质量分数为20%、厚度为3.57 mm时,最小反射损耗值达到了-59.02 dB,有效吸收频带宽度为4.67 GHz(4.53~9.20GHz)。CoNi@C的双金属组分与核壳结构的协同作用有效地增强了材料对电磁波的吸收能力,研究结果可为宽频吸波复合材料的结构设计和阻抗匹配特性优化提供新思路。
To develop high-performance electromagnetic wave absorbers,a CoNi@C(cobalt-nickel alloy@carbon nanocomposite)was fabricated using Co-MOF(metal-organic framework)as a precursor.A two-step method involving ion exchange and high-temperature calcination was employed.The composition,structure,and morphology of the composite material were characterized using instruments such as scanning electron microscopy,transmission electron microscopy,and X-ray diffractometer.Moreover,the effect of different calcination temperatures on the electromagnetic wave absorption performance of the composite was investigated further by using a vector network analyzer.The results show that the CoNi@C nanocomposite displays a porous core-shell structure,where the CoNi alloy nanoparticles are uniformly embedded within a carbon shell.Notably,the CoNi@C composite calcinated at 600℃holds exceptional absorption performance.When the mass fraction in the paraffin medium is 20%and at a thickness of 3.57 mm,the composite exhibits a minimum reflection loss of−59.02 dB,effectively absorbing within a bandwidth of 4.67 GHz(spanning from 4.53 to 9.20 GHz).The synergistic effect of the bimetallic components and rational core-shell structure significantly improve electromagnetic wave absorption performance of the composite.This work presents a novel method for the structural design and optimization of impedance matching characteristics of broadband absorbing materials.
作者
李世奇
江明明
张青峰
蔡玉荣
LI Shiqi;JIANG Mingming;ZHANG Qingfeng;CAI Yurong(School of Materials Science and Engineering,Zhejiang Sci-Tech University,Hangzhou 310018,China)
出处
《广州化学》
2025年第6期24-30,I0002,共8页
Guangzhou Chemistry
基金
浙江省重点研发计划-双边产业联合研发计划项目(项目编号2022C04027)。
关键词
核壳结构
CoNi@C
复合材料
吸波
电磁参数
core-shell structure
CoNi@C
composite material
microwave absorption
electromagnetic parameter
