中文摘要：

以多壁碳纳米管及多层石墨烯作为添加剂与聚偏二氟乙烯基体复合，制备介电性能优异的纳米碳／聚合物复合材料。通过SEM，TEM，AFM，XPS，FT-IR等手段对添加剂的结构、成分及其在聚合物基体中的分散性进行了表征。对多壁碳纳米管进行羧基及酯基修饰后，提高其在聚合物基体中的分散性，复合材料的介电性能明显提高。对多层石墨烯进行强碱水热处理后，多层石墨烯表面羟基含量增加，多层石墨烯／聚偏二氟乙烯复合材料的导电阈值增加，复合材料的介电性能大大增强，表现出比碳纳米管掺杂的复合材料更加优异的介电性能。

英文摘要：

Polymer based composites with high dielectric properties were fabricated with multi-walled carbon nanotube （MWNTs） and few layer graphene nanosheets （FLGs） acting as conductive fillers. Using methods such as SEM, TEM, AFM, XPS, FT-IR, the composition and structure of nano-sized carbon materials and their dispersion in the polymer matrix were measured and characterized. After carboxylic and ester functionalization, the composites show significant increase in di- electric constant due to improvement of the dispersion of MWNTs in the polymer matrix. After one-step alkaline-mediated hy- drothermal treatment, hydroxyl content increases on the surface of the FLGs. The percolation threshold of FLGs/polymer composites increases accordingly and the composites show better dielectric properties than nano-sized carbon materials.