Abstract
Epoxy resin nanocomposites with In2O3 doped 15% Sn (ITO) as nanofillers were fabricated to investigate the relationship between the polarization and depolarization current (PDC). The PDC, time to frequency domain transformation, dielectric parameters, charge carrier mobility and absorption current of epoxy nanocomposites samples are discussed. It is observed that the current magnitude increases in the nanocomposites with loading of nano-ITO than that of pure epoxy. While the current behavior through the epoxy decreases with time in a conventional manner, all nanocomposites reveal a decrease equally. Absorption current is an important characteristic of polymers with regard to their time domain response at direct field. The results of absorption current measurements can be used to understand the relationship between space charge accumulation and movement. The charge accumulation is likely to be influenced by the presence of charge trapping sites, which are associated with interactions between the nanoparticles and amorphous phases. The presence of such interfaces will affect the current flow due to the modification of the distribution of trapping sites within the material. Our results indicate that the absorption current behavior was affected by the added nano-ITO in epoxy matrix. (C) 2015 Elsevier Ltd. All rights reserved.