Enhanced dielectric permittivity of a flexible three-phase polyimide– graphene–BaTiO3 composite material.
Jingni Liu, GuofengTian, Shengli Qi, Zhanpeng Wu, Dezhen Wu*
Materials Letters, 2014, 124:117–119
【摘要】A flexible three-phase composite material with enhanced dielectric permittivity was prepared with both graphene and BaTiO3 nanoparticles as fillers and polyimide (PI) as matrix. Studies on the dielectric properties of PI–graphene–BaTiO3 composite materials in the frequency range from 102 to 106 Hz show that they possess excellent dielectric permittivity (ε=170.39) and lower dielectric loss thanks to their unique dimensional structure. In consideration of the percolation theory and microcapacitor model, a percolation threshold of 1.11 vol% was calculated and the mechani** of the enhancement of the dielectric permittivity of the composite material was discussed.
