中文摘要：

本文详细阐述了石墨烯和球形纳米颗粒间提高复合物热导率的协同效应。石墨烯和纳米颗粒在复合物中可形成紧密堆积结构,该结构阻止了石墨烯的团聚。二维的石墨烯能够在纳米颗粒之间架桥,为复合体系提供了更加有效的声子传输通道,降低了界面热阻。当石墨烯添加量为质量分数1.0%时,导热硅脂的热导率达到了3.45 W/（m·K）,EVA复合材料的热导率达到了2.41 W/（m·K）;在PC/ABS基体中,石墨烯添加质量分数0.5%时,热导率达到3.11 W/（m·K）;在环氧树脂基体中,当负载银的石墨烯填充量为质量分数5.0%时,热导率到达了0.95 W/（m·K）。

英文摘要：

A remarkable synergistic effect between graphene and spherical nanoparticles in improving the thermal conductivity of composites is demonstrated. Graphene can form compact packing structure with nanoparticles in composite, and it will hinder the aggregation of graphene to form clusters. 2D graphene bridge the spherical nanoparticles, and they provide more effective pathways for phonon transport in the composites and decrease the thermal boundary resistance. The maximum thermal conductivity of thermal grease with graphene （weight percent 1.0%） and Al2O3 （weight percent 63%） is 3.45 W/（m·K） and EVA composite with graphene （weight percent 1.0%） and Al2O3 （weight percent 79%） is 2.41 W/（m·K）. The thermal conductivity of PC/ABS composite is 3.11 W/（m·K） with Al2O3/MgO （weight percent 69.5%） and graphene （weight percent 0.5%）. The thermal conductivity of epoxy resin matrix with 5.0% （weight percent） Ag nanopartiele-decorated graphene as thermal conductive fillers is 0.95 W/（m·K）.