具有超疏水宽频吸波性能的磁功能化石墨烯气凝胶
Magnetic Functionalized Graphene Aerogel with Super-hydrophobic and Ultra-wide Bandwidth Absorption Properties
申志豪 1关淋月 1农芳桂 1张健熙 1侯子明 1徐东卫2
作者信息
- 1. 郑州航空工业管理学院材料学院,河南 郑州 450046
- 2. 郑州航空工业管理学院材料学院,河南 郑州 450046;郑州航空工业管理学院河南省航空材料与应用技术重点实验室,河南 郑州 450046
- 折叠
摘要
三维"泡沫型"结构石墨烯气凝胶具有高比表面积及独特的多孔结构特性,使其成为了最具发展潜力的轻质宽频微波吸收材料.采用化学还原自组装法构筑含有金属乙酰丙酮络合物的石墨烯水凝胶,经冷冻干燥、原位热解过程成功制备Co磁性纳米粒子修饰的超疏水石墨烯气凝胶(Co@SMGA),通过粉末X射线衍射(XRD)、拉曼光谱、X射线光电子能谱(XPS)、扫描电镜(SEM)和透射电镜(TEM)等手段测试表征复合材料的结构和物相组成,基于同轴法测试其电磁参数并利用Matlab模拟反射损耗.实验结果表明:煅烧温度对磁功能化石墨烯气凝胶复合材料的微波吸收性能有重要影响,煅烧温度450℃、超低填充量4wt％的复合材料具有最优异的吸波性能,其最小反射损耗(RLmin)为-45.3 dB,匹配厚度为2.5 mm时,有效吸收带宽(EAB)达到6.5 GHz.
Abstract
Graphene aerogels due to their unique three-dimensional foam porous structure and high surface area have been a candidate for lightweight,broadband microwave absorption materials.In this paper,a graphene hydrogel containing metal acetylacetone complex was constructed by chemical reduction self-assembly method.Super-hydrophobic graphene aerogels modified with magnetic Co nanoparticles were successfully prepared by freeze-drying and in situ pyrolysis process(Co@SMGA).The structure and phase composition of the composites were tested and characterized by powder X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM)and transmission electron microscopy(TEM),respectively.The electromagnetic parameters were measured by coaxial method and the reflection loss was simulated by Matlab.The results show that the calcination temperatures have an important effect on the microwave absorption properties of magnetic functionalized graphene aerogels composites.The results demonstrated that when the calcination temperature was 450 ℃,the Co@SMGA-450 hybrids with only 4wt％of functional fillers reached a minimum reflection loss value of-45.3 dB and a maximum effective absorption bandwidth(EAB,below-10 dB)of 6.5 GHz at 2.5 mm.
关键词
石墨烯气凝胶/自组装/微波吸收性能/阻抗匹配Key words
graphene aerogels/self-assembly/microwave absorption performance/impedance matching引用本文复制引用
基金项目
河南省自然科学基金项目(232300420332)
河南省高校重点科研项目(23A430006)
郑州航空工业管理学院青年基金科研专项(23ZHQN01005)
出版年
2024
NETL
NSTL
维普
万方数据