Engineered ferroelectric PVDF composites containing BaTiO3-based core-shell inclusions: dielectric properties and 3D FEM modelling of field distribution

Giovanna Canu

Institute of Condensed Matter Chemistry and Technologies for Energy, National Research Council

Giovanna Canu is currently a researcher at the Institute of Condensed Matter Chemistry and Energy Terchnologies (ICMATE, former IENI) of the National Research Council of Italy in Genoa.After obtaining the Master of Science in Physics with specialisation in Condensed Matter, and the PhD in Materials Science and Technology, she has worked in the field of Materials Science, widening her experience by carrying out her activity in different laboratories, that is the University of Genoa, the institutes CNR-SPIN and CNR-IENI in Genoa, and also abroad, at the Jožef Stefan Institute in Ljubljana, Slovenia, and as a visiting scientist at the Academy of Sciences of the Czech Republic, Department of Physics, Prague, Czech Republic and the University of Aveiro, Aveiro, Portugal. Her interest is in the synthesis of materials and their characterisation, especially ferroelectric materials and ionic conductors. She has gained experience in oxides powder synthesis, oxide film deposition, both thin (~100 nm) and thick films (~10-100 um), starting respectively from solutions or suspensions and slurries, and ceramics preparation. She is familiar with the most common morphological and structural characterisation methods for powders, ceramics and films. She has also worked on the electrical characterisation of films, ceramics and devices, and she is currently working on dielectric characterisation of ferroelectric ceramics and composites.

Abstract

The demand for high dielectric constant materials and high energy density capacitors has rapidly increased in recent years due to the continuous and rapid development of the electronic industry and the need to store electrostatic energy more efficiently. The high breakdown field typical of polymers can be preserved while increasing the effective permittivity, if ferroelectric inclusions are embedded in the polymer matrix by forming a 0-3 connectivity composite, thus improving the stored energy density. The dielectric properties of the composite can be tailored by varying size, shape and volume fraction of the inclusions as well as the dielectric constant of the polymeric matrix, thus altering the electric field distribution inside the material. Moreover, the distribution of the electric field can be modified by coating the particles used as inclusions with an oxide layer with a different dielectric constant.

In this work we have fabricated poly(vinylidene fluoride) (PVDF) composites containing 30 vol.% BaTiO₃@AO₂ (A = Si, Ti) particles and measured their dielectric properties. Barium titanate particles with a diameter of ≈100 nm were synthesized using a hydrothermal-like method and coated with a thin shell (≈10 nm) of SiO₂ or TiO₂ by means of colloidal chemistry methods. The composites were prepared by solvent casting followed by compression moulding.

The dielectric properties of the composites (permittivity and loss tangent) were measured at different frequencies and several temperatures. The coating results in a significant modification of the effective permittivity, which is mainly determined by the value of its dielectric constant. To gain insight into the role of the coating layer, the electric field distribution and effective dielectric constant were calculated for the different composites using a 3D finite element modelling and compared to experimental results.

Acknowledgement

Work carried out in the framework of Project Polycom (IDROL:10359) funded by Fondazione Bancaria Compagnia di San Paolo.

Authors

Giovanna Canu (Institute of Condensed Matter Chemistry and Technologies for Energy, National Research Council)
Elisabetta Brunengo (Institute for Macromolecular Studies, National Research Council)
Maria Teresa Buscaglia (Institute of Condensed Matter Chemistry and Technologies for Energy, National Research Council)
Lucia Conzatti (Institute for Macromolecular Studies, National Research Council)
Chiara Costa (Institute of Condensed Matter Chemistry and Technologies for Energy, National Research Council)
Lavinia Curecheriu (Dielectrics, Ferroelectrics & Multiferroics Group, Department of Physics, Alexandru Ioan Cuza University)
Liliana Mitoseriu (Dielectrics, Ferroelectrics & Multiferroics Group, Department of Physics, Alexandru Ioan Cuza University)
Leontin Padurariu (Dielectrics, Ferroelectrics & Multiferroics Group, Department of Physics, Alexandru Ioan Cuza University)
Ilaria Schizzi (Institute for Macromolecular Studies, National Research Council)
Vincenzo Buscaglia (Institute of Condensed Matter Chemistry and Technologies for Energy, National Research Council)
Paola Stagnaro (Institute for Macromolecular Studies, National Research Council)

Topic Areas

Ferroelectrics , Energy Storage , Dielectric properties

Session

PS-3B » Poster Session 3 - Symposium B (17:00 - Wednesday, 11th July, Foyer)

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