Dielectric properties of polydimethylsiloxane composites filled with SrTiO₃ nanoparticles

Abstract

This article deals with the dielectric properties of polydimethylsiloxane (PDMS) nanocomposites filled with SrTiO3 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/SrTiO3 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/SrTiO3 interface.

Largely Improved Breakdown Strength and Discharge Efficiency of Layer‐Structured Nanocomposites by Filling with a Small Loading Fraction of 2D Zirconium Phosphate Nanosheets

“…Nowadays, the most commonly adopted strategy to improve the U d of polymeric dielectrics is incorporating fillers with high polarizations, including ferroelectric and antiferroelectric ceramics (e.g., barium titanate (BaTiO 3 ), [ 6 ] titanium dioxide (TiO 2 ), [ 7 ] strontium titanate (SrTiO 3 ), [ 8–11 ] and sodium niobate (NaNbO 3 ) [ 12,13 ] ). In other words, constructing inorganic/organic composites has been proved to be a promising way to enhance the U d of the polymer composites.…”

Properties of Polysiloxane/Nanosilica Nanodielectrics for Wearable Electronic Devices

“…In addition, the ion transport is accompanied by local motions of different segments of the flexible polymer chains close to the polar nanofiller, and therefore in the interface [ 16 , 52 , 55 ]. With the increase of nanosilica concentration, the interactions between the nanoparticles and the polymer matrix become stronger, leading to a higher dielectric activity in nanocomposites, e.g., a higher dielectric loss peak at higher nanosilica concentrations, as seen in Figure 10 b.…”

“…However, the mechanical properties, and especially the stiffness, of unfilled polysiloxanes are poor. In addition, as most polymers, polysiloxanes are characterized by a low dielectric permittivity [ 16 , 17 , 18 , 19 , 20 ], which is an advantage for some applications, such as insulators, but not for energy storage and energy conversion devices. Either dielectric fillers, such as barium titanate, lead magnesium niobate, lead titanate, zinc oxide and titanium dioxide, or conducting fillers, such as carbon black, carbon nanotubes and graphene oxide, have been tested to increase the dielectric permittivity of polysiloxanes [ 15 , 17 , 18 , 19 ].…”

Liquid Metal Patterned Stretchable and Soft Capacitive Sensor with Enhanced Dielectric Property Enabled by Graphite Nanofiber Fillers

“…Graphene Oxide 3.4-9.6 [39] 0.5 vol % PDA@SiO 2 @GO 1 ~6 [40] 6 wt % SrTiO 3 2 ~14 [76] 30 vol % Carbon Black ~6.5 [42] 4 wt % CCTO 3 6.5 [43] 20 wt % BaTiO 3 4 ~5 [44] 40 wt % TiO 2 5 ~4.5-4.9 [77] 8-10 vol % TiO 2 @SiO 2 6 ~7 [45] 16 vol % Ag@SiO 2 7 6.8 [78] 3 wt % GNF (this work) 6.41 6 wt % 1 Polydopamine modified silicon dioxide@graphite oxide hybrid. 2 Strontium titanate.…”