Fabrication and dielectric properties of the BaTiO3-polymer nano-composite thin films

Y. Kobayashi, T. Tanase, T. Tabata, T. Miwa, M. Konno

Research output: Contribution to journalArticle

166 Citations (Scopus)

Abstract

To prepare high dielectric thin film of polymer-based materials, nanometer sized barium titanate (BaTiO3) particles, which should have high dielectric coefficients and low energy dissipation factors due to nano-size effects, were dispersed in polyvinylidene fluoride (PVDF) or siloxane-modified polyamideimide (SPAI). The BaTiO3 particles with crystal sizes of 10.5-34.6 nm were synthesized with a complex alkoxide method. Polymer/N-methyl-2-pyrrodinone solution suspending the BaTiO3 particles was spin-coated on ITO glass substrates to prepare polymer-based composite films with thickness of submicron meters. The BaTiO3 particles were dispersed more homogeneously in the PVDF film than in the SPAI film. The good dispersion of the particles in the PVDF film brought about a smooth surface of the film that had a root mean square roughness less than 20 nm at a particle volume fraction of 30%. The roughness was less than one-tenth of the roughness of the SPAI composite film. An increase in the BaTiO3 crystal size from 10.5 to 34.6 nm in the PVDF film at a particle volume fraction of 30% increased the dielectric constant of the film from 20.1 to 31.8. The BaTiO3-PVDF composite film attained high dielectric constant that had more than twice the dielectric constant of the BaTiO3-SPAI composite film. The dissipation factor of the PVDF composite film was as low as 0.05 at 104 Hz.

Original languageEnglish
Pages (from-to)117-122
Number of pages6
JournalJournal of the European Ceramic Society
Volume28
Issue number1
DOIs
Publication statusPublished - 2008 Jan 1

Keywords

  • BaTiO and titanates
  • Composites
  • Dielectric properties
  • Films
  • Polymer

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Fabrication and dielectric properties of the BaTiO<sub>3</sub>-polymer nano-composite thin films'. Together they form a unique fingerprint.

  • Cite this