摘要
通过Staudenmaier法制备了完全氧化的氧化石墨(GO),并通过高温热膨胀制备了单层石墨烯(graphene)。用FT-IR和TG对GO的氧化程度、含氧官能团进行了表征,用SEM和TEM对天然石墨(NG)、GO和graphene的微观结构进行了分析。利用超声共混法制备了graphene/环氧树脂介电纳米复合材料,介电性能的测试表明,graphene的加入使环氧树脂介电常数大幅提高,当graphene添加量为0.25%(质量分数)时,材料介电常数达到25,是纯环氧树脂的4倍,介电损耗0.11。这为石墨烯在介电储能方面的应用和低成本介电复合材料的制备提供了新思路。
The fully oxidized graphite oxide （GO） was prepared by Staudenmaier method, and single layer of graphene was obtained through the thermal expansion mechanism. The oxide degree and oxygen containing functional groups of graphite oxide had been investigated by FT-IR, TG the microstructure of natural graphite （NG）, GO and graphene had been analysed by SEM and TEM. The graphene/epoxy nanocomposites had been prepared by ultrasonic processing and mixture method. Dielectric results showed graphene could imporve dielectric constant of PVDF,and when the quality ratio of graphene got 0.25%, the permittivity of composite got to 25, which was 4 times of pure epoxy. A novel ideal of graphene＇s application in dielectric and preparation high charge storage density capacitor of low cost was expolred.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2012年第9期1185-1188,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50903079)
关键词
石墨烯
复合材料
介电性能
graphene composite
dielectric property
