title: 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.
authors.affiliation: Department of Mechanical Engineering, University of California , Berkeley, California 94720, United States.
authors.forename: Anju
authors.identifier: http://orcid.org/0000-0002-8613-7547
authors.initials: A
authors.lastname: Toor
authors.affiliation: Department of Mechanical Engineering, University of California , Berkeley, California 94720, United States.
authors.forename: Hongyun
authors.identifier: http://orcid.org/0000-0003-3870-388X
authors.initials: H
authors.lastname: So
authors.affiliation: Department of Mechanical and Aerospace Engineering, University of California , San Diego, California 92093, United States.
authors.forename: Albert P
authors.initials: AP
authors.lastname: Pisano
keywords: dielectric; nanocomposite; nanoparticle; particle dispersion; polymer