Designing BaTiO3/carbon nanotube core-shell hybrids to achieve polyvinylidene fluoride composites with high dielectric properties. (24th April 2019)

• Record Type: Journal Article
• Authors: Fan, Benhui; Zhou, Mingyu; Zhang, Chong; Liu, Yu; He, Delong; Bai, Jinbo
• Is Part Of: Materials research express. Volume 6:Number 7(2019)
• Publication Date: 2019-04-24
• Subjects: BaTiO3 coating CNT -- PVDF composites -- dielectric properties -- percolation; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/ab18d2
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: The synthesized core–shell hybrids, BaTiO3 (shell) @ carbon nanotubes (core), (BT@CNT), can make the polyvinylidene fluoride (PVDF) matrix composite to exhibit high dielectric permittivity ( ε ′) but low dielectric loss (tan δ ) when approaching the percolation threshold. High ε ′ is attributed to BT coating which can strengthen the interfacial polarization in the composite. Low tan δ is attributed to the formation of the structure: CNT → BT → PVDF with the gradually decreasing dielectric properties from the centers of hybrid to the surrounding borders of PVDF. Additionally, AC conductivity of the composites can be deduced by the self-consistent effective medium (SCEM) approximation, which helps to understand the conductive behavior of CNT with a ceramic buffer layer in PVDF matrix more comprehensively.