High dielectric constant and low loss of polymeric dielectric composites filled by carbon nanotubes adhering BaTiO₃ hybrid particles

Abstract

We reported the preparation of carbon nanotubes adhering BaTiO 3 nanoparticles (BT@CNTs) via chemical vapor deposition (CVD). Scanning electron microscopy, transmission electron microscope and Raman spectroscopy were carried out in order to confirm the successful adhesion. Dielectric properties of the PVDF-HFP composites filled by BT@CNTs were also studied. With the content of BT@CNTs increasing, the dielectric constant of composites remarkably increased, but the loss tangent gradually decreased. At 10 vol%, the dielectric constant of the PVDF-HFP/BT@CNTs composite was significantly increased to 27.7 at 50 Hz, which was 3 times and 65% higher than that of the pure PVDF-HFP and PVDF-HFP/BT composite, respectively. The loss tangent of the PVDF-HFP/BT@CNTs composite was lower even than that of pure PVDF-HFP. These attractive features of the PVDF-HFP/BT@CNTs composites suggested that the method proposed herein was a new approach to develop high performance composites, especially those with high dielectric constant and low dielectric loss.

1D/2D Carbon Nanomaterial‐Polymer Dielectric Composites with High Permittivity for Power Energy Storage Applications

“…They used the chemical vapor deposition (CVD) method to grow fewer CNTs on the surface of BT (BT@CNTs), and found that BT@CNTs greatly improve the dielectric properties of poly(vinylidene fluoride‐co‐hexafluoropropylene) (PVDF‐HFP). The BT@CNTs/PVDF‐HFP with 10 vol% BT@CNTs had a permittivity of 27.7 at 10 3 Hz, which was 1.65 times higher than the BT/PVDF‐HFP with 10 vol% BT, while the dielectric loss was even lower than pure PVDF‐HFP …”

A facile one step conversion of the sub-micrometer to uniform nanopowder in tetragonal BaTiO3 via a surface active etching salt

“…[1][2][3]. To date, the nanoscale of BaTiO 3 has created increasing interest for the design of high-k gate dielectric ceramicpolymer nanocomposite films in flexible nanogenerators and flexible capacitors for energy storage applications [4][5][6][7][8]. The use of nanoscale filler particles not only decreases the thickness of nanocomposite films, but also improves high interfacial areas significantly, resulting in higher dielectric response and breakdown strength [4][5][6][7][8].…”

“…To date, the nanoscale of BaTiO 3 has created increasing interest for the design of high-k gate dielectric ceramicpolymer nanocomposite films in flexible nanogenerators and flexible capacitors for energy storage applications [4][5][6][7][8]. The use of nanoscale filler particles not only decreases the thickness of nanocomposite films, but also improves high interfacial areas significantly, resulting in higher dielectric response and breakdown strength [4][5][6][7][8]. In addition to smallsized particles, the uniform shape and aggregate-free composites also play a critical role in the performance of nanocomposites, because various shapes and sizes usually lead to different interfacial polarization [4][5][6].…”

Multifunctional nanocomposites of poly(vinylidene fluoride) reinforced by carbon nanotubes and magnetite nanoparticles

“…Furthermore the addition of a third phase in the form of inorganic inclusions has been explored with the aim to enhance the multifunctionality of the prepared ternary composites. For example, in very recent works on ternary PVDF/CNT composites it has been shown that the addition of graphene oxide enhances the thermal conductivity [16], while BaTiO 3 incorporation greatly increases the dielectric permittivity [17]. The present work deals with a novel three-phase PVDF based system with CNT and nanosized Fe 3 O 4 as inclusions.…”