Structural and dielectric characterization of synthesized nano-BSTO/PVDF composites for smart sensor applications

Abstract

In this study, nanoparticles of Ba1−xSrxTiO3 (where x = 0.0, 0.1, 0.2, 0.3, and 0.4) have been prepared using a chemical method.

CsPbI3–PVDF Composite-Based Multimode Hybrid Piezo-Triboelectric Nanogenerator: Self-Powered Moisture Monitoring System

“…The dependence of the AC conductivity of all hybrid samples on the frequency of the external field in the range of 1 kHz to 10 MHz is presented in Figure c. Due to the insulating nature of the films, the conductivity shows strong frequency dependence. ,, At low frequencies, the AC conductivity is low, but it increases rapidly with increasing frequency. ,, All the composite films follow similar trends, and among them, PVI 5 exhibits the highest conductivity. For the PVI 5 film, the conductivity reaches 5.06 × 10 –4 S/m at frequency 10 MHz, which is almost seven times that of the pristine PVDF film (0.7 × 10 –4 S/m).…”

“…However, as the frequency of field polarizations disappears one by one, the dielectric constant decreases. 37,38 On the other side, the dielectric constant increases gradually as the filler content increases in the PVDF matrix, and the dielectric constant decreases with loading more than 5 wt % filler in the PVDF matrix. At a frequency of 1 kHz, the dielectric constant is about 69.7 for the PVI 5 film, whereas the dielectric constant for pristine PVDF is 16.7 at the same frequency.…”

“…20,37,38 At low frequencies, the AC conductivity is low, but it increases rapidly with increasing frequency. 20,37,38 All the composite films follow similar trends, and among them, PVI 5 exhibits the highest conductivity. For the PVI 5 film, the conductivity reaches 5.06 × 10 −4 S/m at frequency 10 MHz, which is almost seven times that of the pristine PVDF film (0.7 × 10 −4 S/m).…”

“…Due to the insulating nature of the films, the conductivity shows strong frequency dependence. 20,37,38 At low frequencies, the AC conductivity is low, but it increases rapidly with increasing frequency. 20,37,38 All the composite films follow similar trends, and among them, PVI 5 exhibits the highest conductivity.…”

Simultaneously enhanced of energy storage and energy harvesting performances of [(Bi0.5Na0.5)TiO3–BaTiO3] ceramics by addition of SrTiO3

“…The bipolar strain curves of (0.9-x) NBT-0.1BT-xST) ceramics (0.0 x 0.4) measured at 10 Hz with an applied electric field of 60 kV cm −1 are displayed in figure 7(f). Pure BNT-BT and 10% mol exhibit conventional butterfly-strain shaped with large negative strain S neg (0.06, 0.05) %, respectively [41]. The negative strain could be attributed to the reversible domain switching during bipolar cycles which has negative effect into piezoelectric response.…”