Dielectric properties of polydimethylsiloxane composites filled with <scp>SrTiO<sub>3</sub></scp> nanoparticles
Povilas Bertašius, Sébastien Schaefer, J. Macutkevič, J. Banys, Algirdas Selskis, Vanessa Fierro, Alain Celzard
Abstract
Abstract This article deals with the dielectric properties of polydimethylsiloxane (PDMS) nanocomposites filled with SrTiO 3 nanoparticles. The investigations were performed over a very broad range of frequencies (20 Hz to 3 THz). Almost no dielectric dispersion was observed in all the composites at room temperature over the entire range of measurement frequencies, and the dielectric losses were also very low under these conditions (<1.9). The dielectric dispersion was observed at lower temperatures (below 280 K), due to relaxation at the PDMS/SrTiO 3 interface and in the bulk polymer. The relaxation time for both cases followed the Vogel–Vulcher law, while the freezing temperature was substantially lower for relaxation at the PDMS/SrTiO 3 interface.