title: Significantly Enhanced Dielectric Performance of Poly(vinylidene fluoride-co-hexafluoropylene)-based Composites Filled with Hierarchical Flower-like TiO₂ Particles.
abstract: In this study, we report a feasible strategy for fabricating high-dielectric-constant polymer composites for applications in energy storage devices and embedded capacitors. Hierarchical flower-like TiO2 particles were prepared via a facile solvothermal process and incorporated into the P(VDF-HFP) matrix. The temperature and frequency dependent dielectric properties of flower-like TiO2/P(VDF-HFP) composites as well as commercial TiO2/P(VDF-HFP) composites were investigated. The results reveal that the flower-like TiO2 particles are more effective in increasing the dielectric constant of P(VDF-HFP) when compared with commercial TiO2. Typically, the dielectric constant of the P(VDF-HFP) composite filled with 20 vol % flower-like TiO2 reaches 83.1 at 100 Hz, in contrast to 43.4 for the composite filled with 20 vol % commercial TiO2 and 11.3 for pristine P(VDF-HFP). Also, the flower-like TiO2-filled composites exhibit similar characteristic breakdown strengths to their commercial TiO2-filled counterparts. The significant improvement in the dielectric constant could be attributed to the enhancement of Maxwell-Wagner-Sillars polarization, which originates from the sophisticated morphology of flower-like TiO2 particles.
authors.affiliation: School of Materials Science and Engineering, State Key Lab Silicon Mat, Zhejiang University , Hangzhou 310027, People's Republic of China.
authors.forename: Nuoxin
authors.initials: N
authors.lastname: Xu
authors.affiliation: School of Materials Science and Engineering, State Key Lab Silicon Mat, Zhejiang University , Hangzhou 310027, People's Republic of China.
authors.forename: Liang
authors.initials: L
authors.lastname: Hu
authors.affiliation: School of Materials Science and Engineering, State Key Lab Silicon Mat, Zhejiang University , Hangzhou 310027, People's Republic of China.
authors.forename: Qilong
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: School of Materials Science and Engineering, State Key Lab Silicon Mat, Zhejiang University , Hangzhou 310027, People's Republic of China.
authors.forename: Xingrong
authors.initials: X
authors.lastname: Xiao
authors.affiliation: School of Materials Science and Engineering, State Key Lab Silicon Mat, Zhejiang University , Hangzhou 310027, People's Republic of China.
authors.forename: Hui
authors.initials: H
authors.lastname: Yang
authors.affiliation: School of Materials Science and Engineering, State Key Lab Silicon Mat, Zhejiang University , Hangzhou 310027, People's Republic of China.
authors.forename: Enjie
authors.initials: E
authors.lastname: Yu
keywords: dielectric constant; flower-like particles; interface polarization; poly(vinylidene fluoride-co-hexafluoropylene); polymer-based composite