Alumina-coated graphene sheet hybrids for electrically insulating polymer composites with high thermal conductivity

作者：Qian, Rong; Yu, Jinhong; Wu, Chao; Zhai, Xing; Jiang, Pingkai^*

来源：RSC Advances, 2013, 3(38): 17373-17379.

DOI：10.1039/c3ra42104j

• GRAPHITE NANOPLATELET
• DIELECTRIC-PROPERTIES
• EPOXY NANOCOMPOSITES
• LAYER GRAPHENE
• NITRIDE
• OXIDE
• REDUCTION

Al2O3 Graphene has attracted considerable attention as a promising candidate to improve the thermal conductivity of polymers owing to its extremely high intrinsic thermal conductivity (similar to 5300 W m(-1) K). However, graphene-based composites show a high electrical conductivity even with a low loading of fillers, which greatly limits their applications in electronic devices. Herein, we present a new class of fillers of alumina-coated graphene sheet (GS@Al2O3) hybrid fillers via an electrostatic self-assembly route. This unique structural design combines the advantages of both the GS and Al2O3, resulting in PVDF/GS@Al2O3 composites that show not only high thermal conductivity, but also retain high electrical insulation. For instance, the thermal conductivity of PVDF composites with 40 wt% GS@Al2O3 is up to 0.586 W m(-1) K and the volume resistivity is above 4 x 10(14) Omega cm. Moreover, this self-assembly route is a simple and scalable strategy for fabricating high performance thermally conductive materials.

• 出版日期2013
• 单位中国科学院; 中国科学院宁波材料技术与工程研究所; 桂林理工大学; 上海交通大学