Highly dispersible graphene oxide reinforced polypyrrole/polyvinyl alcohol blend nanocomposites with high dielectric constant and low dielectric loss

Abstract

In the present study, we report the fabrication and characterizations of flexible dielectric nanocomposites consisting of water soluble polypyrrole (WPPy)/polyvinyl alcohol (PVA)/graphene oxide (GO) at different GO loadings (0.5 -3 wt %). The WPPy/PVA/GO nanocomposites were characterized using Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, UV-vis spectroscopy (UV), X-ray diffraction (XRD), thermogravimetric analysis (TGA), polarized optical microscopy (POM), Scanning electron microscopy (SEM) and atomic force microscopy (AFM). FTIR studies indicate the strong chemical interaction between GO and polymer systems. SEM results confirm that GO was homogeneously dispersed within the polymer matrix. The nanocomposites exhibit significant enhancement in the dielectric constant with low dielectric loss values as a function of GO loading which resulted from the fine dispersion of GO in the polymer matrix. The dielectric constant increases from (ε = 27.93, 50 Hz, 150 o C) for WPPy/PVA (50/50) blend to (ε = 155.18, 50 Hz, 150 o C) for nanocomposites with 3 wt % GO loading and the dielectric loss increases from (tan δ = 2.01, 50 Hz, 150 o C) for WPPy/PVA (50/50) blend to (tan δ = 4.71, 50 Hz, 150 o C) for nanocomposites with 3 wt % GO loading. Thus, these high-k WPPy/PVA/GO nanocomposites are potential flexible high-performance dielectric materials for electronic devices such as highfrequency capacitors or embedded capacitors.

Fumed SiO2 nanoparticle reinforced biopolymer blend nanocomposites with high dielectric constant and low dielectric loss for flexible organic electronics

“…The dielectric properties such as dielectric constant (ɛ) and dielectric loss (tan δ) of the PVA/PVP blend and PVA/PVP/SiO 2 nanocomposite films were evaluated using an impedance analyzer at various frequencies (10 −2 Hz to 20 MHz) and temperatures (40–150 °C). Generally, the dielectric properties of polymer nanocomposites depend on the chemical structure, surface morphology, and preparation method and on the presence of different additives in the polymer matrix . Figure (a–f) shows the dielectric constant plots for the PVA/PVP blend and PVA/PVP/SiO 2 nanocomposite films.…”

Influence of Cerium Oxide (CeO2) Nanoparticles on the Structural, Morphological, Mechanical and Dielectric Properties of PVA/PPy Blend Nanocomposites

“…It can be explained on the basis that the dipole of the composites do not get enough time to re-orient themselves in the direction of applied electric field. [18,19]. Fig.…”

Impedance spectroscopy, ionic conductivity and dielectric studies of new Li+ ion conducting polymer blend electrolytes based on biodegradable polymers for solid state battery applications

“…PVA is non-toxic, biocompatible polymer having good transparency and fast charge transfer at the electrode-electrolyte interface. PVA has been chosen as one of the host polymers for the present study because of its excellent hydrophilic properties, high mechanical strength, good resistance to various chemicals and excellent film forming ability [25,26].…”