High energy density polymer nanocomposites with Y-doped barium strontium titanate nanoparticles as fillers

Abstract

Dielectric nanocomposites with an enhanced energy density are highly desired in modern electronic and electrical power systems. In this study, the authors developed a new flexible dielectric nanocomposite thin film using Y-doped barium strontium titanate (Y:BST) nanoparticles as fillers and polyvinylidene fluoride as a polymer matrix. The nanocomposites exhibited a high energy density of 11.07 J/cm^3 at 4300 kV/cm with a low filler content. Through the analysis of defect chemistry with X-ray photoelectron spectroscopy, the dopant Y^3+ occupies A-site of the perovskite structure, which is associated with the generation of Ba&Sr vacancies and oxygen vacancies for charge compensation. As a result, TiO(6)^2– octahedron distortion occurs, which is responsible for the enhanced dielectric permittivity. Meanwhile, the dielectric loss maintains a low level and the breakdown strength increases at a low filler loading, resulting in improved energy density.

Keywords

• filled polymers
• nanoparticles
• nanocomposites
• vacancies (crystal)
• X-ray photoelectron spectra
• strontium compounds
• barium compounds
• nanofabrication
• electric breakdown
• permittivity
• dielectric losses
• yttrium
• low filler content
• X-ray photoelectron spectroscopy
• enhanced dielectric permittivity
• dielectric loss
• high energy density polymer nanocomposites
• Y-doped barium strontium titanate nanoparticles
• electrical power systems
• polyvinylidene fluoride
• polymer matrix
• electronic power systems
• dielectric nanocomposite thin film
• defect chemistry
• perovskite structure
• oxygen vacancies
• breakdown strength
• Ba(0.5)Sr(0.5)TiO(3):Y