Study of structural, optical and dielectric properties of ZnO/PVDF-based flexible sheets

Progress of Polymer-Based Dielectric Composites Prepared Using Fused Deposition Modeling 3D Printing

Polymer-based dielectric composites are of great importance in advanced electronic industries and energy storage because of their high dielectric constant, good processability, low weight, and low dielectric loss. FDM (Fused Deposition Modeling) is a greatly accessible additive manufacturing technology, which has a number of applications in the fabrication of RF components, but the unavoidable porosity in FDM 3D-printed materials, which affects the dielectric properties of the materials, and the difficulty of large-scale fabrication of composites by FDM limit its application scope. This study's main focus is on how the matrix, filler, interface, and FDM 3D printing parameters influence the electrical properties of FDM-printed polymer-based dielectric composites. This review article starts with the fundamental theory of dielectrics. It is followed by a summary of the factors influencing dielectric properties in recent research developments, as well as a projection for the future development of FDM-prepared polymer-based dielectric composites. Finally, improving the comprehensive performance of dielectric composites is an important direction for future development.

Thermal and Dielectric Behaviour of Polymer-Based Nanocomposites Flexible Sheets as Highly Stable Dielectric Materials

The silica zinc oxide nanoparticles filled poly-vinylidene-fluoride (PVDF)-based nanocomposite flexible sheets (NC FSs) are synthesized by co-precipitation method. The X-ray diffraction patterns reveal the development of various diffraction planes related to zinc oxide (ZnO) and SiO2 phases. The crystallinity of ZnO phase is decreased with increasing weight percent (wt.%) of silica nanofillers (NFs). The scanning electron microscope microstructure of synthesized PVDF-based NCs FSs is changed with increasing wt.% of silica NFs. The energy-dispersive X-ray spectroscopy and Fourier-transform infrared spectroscopy analyses confirm the presence of different elements and the formation of chemical bonding between them. In high temperature region, the weight-loss of synthesized PVDF-based NCs FSs is decreased from 89.90% to 49.26% with increasing wt.% of silica NFs. The values of dielectric permittivity, loss-factor, impedance, and AC-conductivity of PVDF-based NC FSs synthesized for maximum amount of silica NFs are found to be 13.7, 0.03, 0.16 MΩ, and $19.9\times {10}^{-6}$  S/m, respectively. Results show that the synthesized PVDF-based NC FSs are the potential candidates of light emitting diodes and energy storage devices.

Impact of ZnO Nanoparticle on the Structural and Optical Properties of Poly(vinyl alcohol) Film

Using the cast technique thin films of poly (vinyl alcohol) (PVA) containing varying amounts of Zinc Oxide ZnO nanoparticles (0.001, 0.002, 0.003, 0.004 and 0.005) g were formed. Physical properties excluded structural; (X-Ray Diffraction) (XRD), Fourier Transform Infrared (FT-IR) spectroscopy and UV-Visible spectroscopy. XRD results showed the amorphous structure of PVA film and Hexagonal crystalline structure of ZnONPs, PVA/ZnO nanocomposite appears as pattern of PVA films so the peaks of ZnO don't appear in it. FTIR spectra reveled ZnONPs doesn't have any influence on polymer structure. The effects of the ZnONPs on optical characteristics of PVA like the absorption spectrum, transmission spectrum, energy band gap, absorption coefficient, extinction coefficient, refractive index, real and imaginary parts of dielectric constant has been studied using UV-Vis spectroscopy. This study demonstrates that increasing the number of ZnONPs has an effect on all of these parameters.