Space charge behavior of silicone rubber nanocomposites with thermal step method

In this paper, effects of the space charge behavior of silicone rubber (SiR) nanocomposites with SiO2, Al2O3, and MgO nanoparticles on charge transfer were clarified. To investigate the effects of SiO2, Al2O3, and MgO nanoparticles on space charge profiles, the space charge behavior was measured using a thermal step method system under a dc electric field of 2 to 4 kV/mm. In the case of SiR nanocomposites, a negative packet like charge injection with a peak charge density of more than several hundred C/m3 was measured. The effects of space charge behavior were discussed with the response current associated with the conductivity and permittivity affected by a thermal process. The obtained results showed that the relaxation processes had discrete energy differences with distinct peaks in the response currents of space charge affected by nanoparticles.