Development of novel hybrid 2D-3D graphene oxide diamond micro composite polyimide films to ameliorate electrical & thermal conduction

Abstract

Graphene and its oxides are the most extensively studied, fascinating 2-dimensional Sp2 carbon hybridized materials. Due to its superior and excellent thermal conductivity, it is considered to be a practical solution for the thermal dissipation of electric machines electronic components. Furthermore, graphene oxide invariably reduces electrical insulation capability, which is inappropriate for electrical machines requiring low electrical and high thermal conductivity. Therefore, we have created 2D-3D hybrid graphene oxide (GO)-diamond (DM) micro-composite polyimide (PI) films for high temperature and electrically insulated environments of electric machines such as motors and generators. With a modest filling charge of 10 wt% GO with 10% diamond (DM), the maximum thermal conductivity of 1.83 Wm-1K−1 is achieved for polyimide micro composite and is almost 11 times higher than that of pristine PI films. The 10% PI/GO/DM micro composite films also show lower electrical conductivity than other samples. Hybrid fillers with high thermal and low electrical conductivities are responsible for synergistic improvements in experimental results.