Dielectric behaviors and high energy storage density of nanocomposites with core-shell BaTiO3@TiO2 in poly(vinylidene fluoride-hexafluoropropylene)

Mojtaba Rahimabady, Meysam Sharifzadeh Mirshekarloo, Kui Yao, Li Lu

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Nanocomposites comprising a P(VDF-HFP) polymer matrix and core-shell structured nanoparticle fillers were prepared, in which a crystalline, ultrathin TiO2 shell layer encapsulates BaTiO3 nanoparticles. A large dielectric constant (>110) was obtained, which was unexpectedly more than 3 times higher than that of the nanocomposite without the TiO2 shell layer. The significant improvement in electric polarization is attributed to the highly interactive interfaces among the multiple dielectric materials with the introduction of the intermediate TiO2 layer, which also improves the breakdown field (>340 MV m-1). Thus a resulting dielectric energy density of 12.2 J cm-3 is achieved, among the highest energy densities for polymer-ceramic composites.

Original languageEnglish
Pages (from-to)16242-16248
Number of pages7
JournalPhysical Chemistry Chemical Physics
Issue number38
Publication statusPublished - 14 Oct 2013

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