摘要
本文采用电泳法在泡沫镍表面沉积一层石墨烯,接着浸渍一层聚甲基丙烯酸甲酯,最后去除泡沫镍模板获得石墨烯/聚甲基丙烯酸甲酯泡沫复合材料。采用扫描电镜、四探针电导率仪及矢量网络分析仪等对材料的形貌结构及性能进行表征。结果表明该泡沫复合材料完整地继承了泡沫镍的三维骨架结构,石墨烯在聚合物骨架中相互连接形成全连通的导电网络,使得该复合材料具有良好的电导率及电磁屏蔽性能。孔径0.25mm、厚度1.5mm的该复合材料的电导率最大可达1.5S·m-1,在8~12GHz范围内,其电磁屏蔽效能最高可达12.7dB,其中吸收损耗占总损耗的99%。因此以吸收损耗为主要屏蔽机制的石墨烯/聚甲基丙烯酸甲酯泡沫复合材料是一种有前途的轻质、透气型电磁屏蔽材料。
Graphene nanosheets(GNS)was coated on the surface of foam nickel by electrophoretic deposition,followed by impregnation with polymethylmethacrylate(PMMA).Finally,GNS/PMMA foam composite was obtained by removing the foam nickel template.Morphology and property of the composite were characterized by scanning electronic microscope,transmission electron microscopy,four-probe conductivity meter and scalar measurement system.It has been shown that the three-dimensional network structure of the foam nickel skeleton is completely inherited by the GNS/PMMA foam composite.An interconnected conductive network assisted by PMMA is formed within the GNS,bringing about good electrical conductivity(1.5S·m-1) and electromagnetic shielding property to the material.The electromagnetic-interference(EMI)of the composite with a pore diameter of 0.25mm and a thickness of 1.5mm can reached up to a maximum shielding effectiveness of 12.7dB in the 8-12GHz range,where the loss generated by the absorption is 99%of the total. It indicates that the foam GNS/PMMA composite is a promising EMI shielding material of lightweight and breathability.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2014年第3期358-365,共8页
Journal of Materials Science and Engineering
基金
国家自然科学基金重大研究计划资助项目(90916021)
江苏省研究生培养创新工程资助项目(CXLX12_0141)
关键词
石墨烯
聚甲基丙烯酸甲酯
泡沫复合材料
电磁屏蔽
电泳沉积
Graphene nanosheets
polymethylmethacrylate
foam material
electromagnetic interference shielding
electrophoretic deposition
