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研究了纳米银(Ag)/环氧树脂(EP)复合材料的直流体积电阻率和强场电导。结果表明,在环氧树脂中微量添加小尺寸的银纳米粒子后,复合材料的体积电阻率比纯环氧树脂有明显提高,并且电阻率的增加与银粒子尺寸、含量,以及基体聚合物的特性有关。对复合材料强场电导的研究表明,小尺寸的银粒子在聚合物中分散良好时,复合物的强场电导表现出库仑阻塞特性,即纳米粒子可限制载流子的迁移。而当纳米粒子的粒径过大或添加较多时,复合材料在强电场下表现出对电荷的捕获与脱陷,具有明显的空间电荷限制电流特性。热刺激电流特性反映出纳米粒子与聚合物在界面处形成深陷阱是产生空间电荷限制电流的原因。
The direct current volume resistivity and strong field conductance of nano-Ag / epoxy composites were investigated. The results show that the volume resistivity of the composites is obviously increased compared with the pure epoxy resin after adding a small amount of silver nano-particles in the epoxy resin in a small amount, and the increase of the resistivity is related to the silver particle size, content, Characteristics related. Studies on the strong field conductance of composites show that the strong field conductance of the composites shows the Coulomb blocking characteristics when the silver particles with small size are well dispersed in the polymer, that is, the nanoparticles can limit the carrier migration. However, when the particle size of the nanoparticles is too large or the amount of the nanoparticles is too large, the composite material can capture and detach the charge under a strong electric field and has obvious space charge limited current characteristics. Thermal stimulation current characteristics reflect the formation of deep traps at the interface between nanoparticles and polymers is responsible for the space charge-limited current.