One-dimensional oriented microcapacitors in ternary polymer nanocomposites: Toward high breakdown strength and suppressed loss. (15th February 2018)

• Record Type: Journal Article
• Authors: Song, Silong; Wang, Yao; Luo, Yu; He, Dalong; Abella, Ana; Deng, Yuan
• Is Part Of: Materials & design. Volume 140(2018)
• Page Start: 114
• Page End: 122
• Publication Date: 2018-02-15
• Subjects: Polymer matrix composites -- Dielectric nanocomposite -- Anisotropy -- Microcapacitors -- Breakdown strength; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2017.11.056
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: Poly(vinylidene fluoride) (PVDF) based composites incorporating conductive fillers enable quick achievement of ultrahigh dielectric constant based on percolation theory; however, the accompanying drawbacks high dielectric loss and poor insulation have impeded their practical applications. A novel ternary Bi2 S3 -BaTiO3 /PVDF nanocomposite architecture has been constructed via hot stretching process, where oriented Bi2 S3 nanorods arranged as numerous microcapacitors with homogeneously distributed high- k BaTiO3 nanoparticles embedded in PVDF as dielectric media. The series connected numerous microcapacitors provide high dielectric constant which is testified by microcapacitor model simulation while the alignment of one-dimensional microcapacitors along stretching direction greatly reduces the dielectric loss caused by semiconductor Bi2 S3 . Numerical simulations reveal the positive effect brought by one-dimensional nanofiller orientation in breakdown strength enhancement. This study provide an alternate strategy to reach a balance between high dielectric permittivity, low dielectric loss and high breakdown strength in dielectric composites with conductive filler, which are promising for extensive applications in flexible electronic devices and electrostatic energy storage devices. Graphical abstract: Image 2 Highlights: Novel ternary nanocomposites with oriented one-dimensional Bi2 S3 arrangement have been constructed via stretching process. Microcapacitor model fits well with dielectric constant of oriented composite in the perpendicular direction. Oriented ternary composites show greatly suppressed dielectric loss and enhanced breakdown strength. Numerical simulations reveal the reason for breakdown strength enhancement in oriented composites.