石墨/聚苯乙烯插层复合材料的介电性能研究

Dielectric performances of graphene/PS intercalation composites

采用浓酸处理和高温快速热冲击的工艺制备了单层石墨。用高分辨透射电镜观察了其有序的微观结构,并做了选区电子衍射分析。使用热压成型的工艺制备了单层石墨/聚苯乙烯(PS)复合材料。介电性能测试表明该复合材料的渗流阈值仅为0.1%(质量分数),这样低的渗流阈值有利于使用该类材料的电容器向微型、轻质发展。同时还发现,采用电场诱导和不施加电场的情况下制备的单层石墨/聚苯乙烯复合材料的介电性能有较大区别。

The single sheet graphite（graphene）was successfully obtained by concentrated acid treated and high temperature rapid thermal shocked.High resolution transmission electron microscopy（HRTEM） and selected area electron diffraction（SAED） analysis confirmed the ordered graphene crystal structure.The graphene/polystyrene（PS） composites were prepared materials using the hot forming process.The dielectric performance measurement shown that the graphene/PS nanocomposites have very low percolation threshold（0.1wt%）,such a low percolation threshold is help to the use of such materials development tend to minitype and weigh-light（when the content of grapheme0.1wt%）.Future more,we found that the dielectric properties of graphene/PS nanocomposites have greatly different at with and without electric flied-induced.