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Updated: Jun 9, 2025
Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
Published on: September 19, 2020
Fabrication and High Dielectric Properties of Sandwich-Structured Ba0.6Sr0.4TiO3/Polyvinylidene Fluoride Layered
Shuhang Liu1, Xin Xu2, Mingyu Peng1
1State Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, USI Institute of Intelligence Materials and Structure, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, Shaanxi, P. R. China.
The morphology of barium strontium titanate (BST) fillers significantly impacts the performance of BST/polyvinylidene fluoride (PVDF) composites. Plate-like 2D-BST fillers create parallel interfaces, enhancing breakdown strength and energy storage in flexible devices.
Area of Science:
- Materials Science
- Polymer Science
- Electrical Engineering
Background:
- Barium strontium titanate/polyvinylidene fluoride (BST/PVDF) composites are crucial for flexible electronics.
- Material morphology, beyond composition and structure, critically affects electrical properties.
Purpose of the Study:
- To investigate the influence of BST filler morphology (0D, 1D, 2D) on the microstructure and electrical characteristics of sandwich-structured BST/PVDF composites.
- To elucidate the relationship between filler morphology, interfacial mechanisms, and composite breakdown strength.
Main Methods:
- Fabrication of sandwich-structured BST/PVDF composites using tape-casting.
- Incorporation of different BST morphologies: zero-dimensional (0D), one-dimensional (1D), and two-dimensional (2D).
- Characterization of microstructures and electrical properties, including breakdown strength, energy storage density, dielectric constant, dielectric loss, and tunability.
Main Results:
- Two-dimensional (2D) BST fillers form multiscale parallel interfaces within the sandwich structure, unlike 0D and 1D fillers.
- This unique morphology of 2D-BST significantly enhances the breakdown strength of the composites.
- BST/PVDF composites with 2D-BST achieved high energy storage density (19.71 J/cm³), efficiency (85.3%), dielectric constant (30.4), and dielectric tunability (93.2%).
Conclusions:
- The morphology of BST fillers is a critical design parameter for optimizing BST/PVDF composite performance.
- Plate-like 2D-BST fillers offer a pathway to superior dielectric and energy storage properties in flexible functional composites.
- This research provides a method for developing advanced functional composites for energy storage and flexible electronic applications.
