Dielectric Properties of P(VDF-TrFE-CTFE) Composites Filled with Surface-Coated TiO2 Nanowires by SnO2 Nanoparticles

Abstract

Nanocomposites containing inorganic fillers embedded in polymer matrices have exhibited great potential applications in capacitors. Therefore, an effective method to improve the dielectric properties of polymer is to design novel fillers with a special microstructure. In this work, a combination of hydrothermal method and precipitation method was used to synthesize in situ SnO2 nanoparticles on the surface of one-dimensional TiO2 nanowires (TiO2 NWs), and the TiO2NWs@SnO2 fillers well-dispersed into the poly (vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) [P(VDF-TrFE-CTFE)] polymer. Hybrid structure TiO2NWs @SnO2 introduce extra interfaces, which enhance the interfacial polarization and the dielectric constant. Typically, at 10 vol.% low filling volume fraction, the composite with TiO2NWs @SnO2 shows a dielectric constant of 133.4 at 100 Hz, which is almost four times that of polymer. Besides, the TiO2 NWs prevents the direct contact of SnO2 with each other in the polymer matrix, so the composites still maintain good insulation performance. All the improved performance indicates these composites can be widely useful in electronic devices.

Multi-Trigger Thermo-Electro-Mechanical Soft Actuators under Large Deformations

“…Finally, by performing a fitting procedure for Equations (20) and (21) and experimental data in Figure 1b, the hyperelastic parameters are obtained as reported in Table 1. As shown in Figure 1b, the calibration results for hyperelastic part of the model are in good agreement with those from experiments.…”

“…DEAs as a class of actuators can generate strains higher than 100% in response to an electric field [16]. Furthermore, DEAs due to their unique features such as light-weight, high energy density, low cost, silent operation, and compliance are well-suited for artificial muscle applications, underwater robots, flexible displays, as well as in dielectric elastomer oscillators [17][18][19][20][21]. Dielectric elastomer oscillators enable distributed, autonomous signal generation, that can be controlled in a wide range by external signals or mechanical stimuli [22].…”

Significantly Enhanced Dielectric Properties of Ag-Deposited (In1/2Nb1/2)0.1Ti0.9O2/PVDF Polymer Composites

“…A simple method for achieving an improved dielectric response in polymers is to fill high-ε′ oxides, e.g., and ACu 3 Ti 4 O 12 (ACTO) (A = Ca, Na 1/2 Bi 1/2 , Na 1/2 Y 1/2 , and Na 1/3 Ca 1/3 Bi 1/3 ) [ 7 , 8 , 9 , 10 , 11 ], La 2- x Sr x NiO 4 (LSNO) [ 5 , 6 , 12 ], TiO 2 nanowires [ 13 ], K 0.5 Na 0.5 NbO 3 -SrTiO 3 [ 14 ], and BaTiO 3 (BT) [ 15 , 16 , 17 , 18 , 19 ], into the polymer. The enhanced dielectric properties are attributed to the high ε′ of the filler and interfacial polarization at the interface of the polymer matrix and filler particles.…”

Bilayer-Structured Polymer Nanocomposites Exhibiting High Breakdown Strength and Energy Density via Interfacial Barrier Design

“…In order to improve U, numerous efforts have been made to increase k using the composite approach based on high-k conductive filler such as carbon nanotubes (CNTs) and sliver nanowires, 4,18,19 as well as high-k ceramic filler such as titanium dioxide (TiO2), barium titanate (BaTiO3) and copper titanate calcium (CCTO) dispersed in organic matrices. [20][21][22][23][24][25][26][27] In spite of numerous breakthroughs, it is proven challenging to concomitantly retain low dielectric loss and high breakdown strength along with the improvement of k in the high-k polymer composites, which actually precludes a substantial increment in U. [28][29][30][31] On the other hand, the incorporation of widebandgap nanofiller with a moderate k (e.g., [8][9][10][11][12][13][14][15][16][17][18][19][20], e.g., aluminium oxide (Al2O3) and magnesium oxide (MgO), is found effective in impeding the leakage current and reducing energy loss without significant deteriorations in k and the breakdown strength of the polymer composites.…”

“…[20][21][22][23][24][25][26][27] In spite of numerous breakthroughs, it is proven challenging to concomitantly retain low dielectric loss and high breakdown strength along with the improvement of k in the high-k polymer composites, which actually precludes a substantial increment in U. [28][29][30][31] On the other hand, the incorporation of widebandgap nanofiller with a moderate k (e.g., [8][9][10][11][12][13][14][15][16][17][18][19][20], e.g., aluminium oxide (Al2O3) and magnesium oxide (MgO), is found effective in impeding the leakage current and reducing energy loss without significant deteriorations in k and the breakdown strength of the polymer composites. [32][33][34][35][36] Moreover, compared to zero-dimensional (0-D) Al2O3 nanoparticles and one-dimensional (1-D) Al2O3 nanowires, it was verified that the parallelly arranged two-dimensional (2-D) Al2O3 nanoplates are capable of dispersing the applied electric field throughout the polymer matrix and preventing the propagation of breakdown channels, resulting in higher breakdown strength and smaller leakage current of the polymer nanocomposites.…”