Improved Dielectric Properties of Polyvinylidene Fluoride Nanocomposite Embedded with Poly(vinylpyrrolidone)-Coated Gold Nanoparticles

Abstract

A novel nanocomposite dielectric was developed by embedding polyvinylpyrrolidone (PVP)-encapsulated gold (Au) nanoparticles in the polyvinylidene fluoride (PVDF) polymer matrix. The surface functionalization of Au nanoparticles with PVP facilitates favorable interaction between the particle and polymer phase, enhancing nanoparticle dispersion. To study the effect of entropic interactions on particle dispersion, nanocomposites with two different particle sizes (5 and 20 nm in diameter) were synthesized and characterized. A uniform particle distribution was observed for nanocomposite films consisting of 5 nm Au particles, in contrast to the film with 20 nm particles. The frequency-dependent dielectric permittivity and the loss tangent were studied for the nanocomposite films. These results showed the effectiveness of PVP ligand in controlling the agglomeration of Au particles in the PVDF matrix. Moreover, the study showed the effect of particle concentration on their spatial distribution in the polymer matrix and the dielectric properties of nanocomposite films.

The search for enhanced dielectric strength of polymer‐based dielectrics: A focused review on polymer nanocomposites

“…[ 182–184 ] A PVDF nanocomposite with embedded PVP‐encapsulated gold (Au) nanoparticles exhibits enhanced nanoparticle dispersion due to the favorable particle‐polymer interaction. [ 185 ] The surface functionalization of Au nanoparticles, however, failed to reach low dielectric loss and high dielectric strength. An insulating fluoro‐polymer having similar chemical structure and surface energy to P(VDF‐HFP) matrix was coated on BT via surface‐initiated reversible addition−fragmentation chain transfer (RAFT) polymerization.…”

Fabrication of PVDF/graphene composites with enhanced β phase via conventional melt processing assisted by solid state shear milling technology

“…To meet the application requirements for electronic products, some llers with excellent electrochemical properties, such as graphene (GP), [9][10][11][12] carbon nanotube, 13,14 ceramic (BaTiO 3 , PZT), [15][16][17] metal (Au, Cu), 18,19 metal oxide (ZnO), 20,21 had been chosen and added into PVDF matrix, and PVDF based composites with relatively higher dielectric constant were achieved. Among these llers, GP, a new type of twodimensional carbon nanomaterial with superior mechanical properties, high efficiency electron transfer capability and high thermal conductivity, 22,23 has been of interests recent years.…”

Interfacial Coupling Effect in Organic/Inorganic Nanocomposites with High Energy Density

“…Results imply that robust and stable polymer layers on inorganic particles result in relatively high ε r and E b values for OINs . Usually, the incorporation of a high‐ε r filler phase into the polymer matrix can drastically decrease the E b due to the electric field distortion at the interface caused by the large ε r and conductive contrast between the filler and matrix.…”