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Significantly Enhanced Dielectric Properties of Ag-Deposited (In1/2Nb1/2)0.1Ti0.9O2/PVDF Polymer Composites
Wattana Tuichai1, Pornsawan Kum-Onsa1, Supamas Danwittayakul2
1Giant Dielectric and Computational Design Research Group (GD-CDR), Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand.
Polymers
|June 2, 2021
Summary
Silver nanoparticle-INTO/poly(vinylidene fluoride) composites show enhanced dielectric permittivity (ε′) and low loss tangent (tanδ). This is achieved by incorporating hybrid particles, offering an effective method for advanced dielectric materials.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Dielectric materials are crucial for electronic applications.
- Enhancing dielectric permittivity (ε') while maintaining a low loss tangent (tanδ) is a key challenge.
- Poly(vinylidene fluoride) (PVDF) is a widely used polymer matrix.
Purpose of the Study:
- To investigate the dielectric properties of silver nanoparticle-(In1/2Nb1/2)0.1Ti0.9O2/poly(vinylidene fluoride) (Ag-INTO/PVDF) composites.
- To enhance dielectric permittivity (ε') and minimize loss tangent (tanδ) by incorporating hybrid filler particles.
- To understand the relationship between filler content and dielectric performance.
Main Methods:
- Fabrication of hybrid Ag-INTO particles by coating silver nanoparticles onto INTO particles.
- Preparation of Ag-INTO/PVDF composites with varying filler volume fractions (fAg-INTO).
- Characterization of dielectric properties (ε' and tanδ) using impedance spectroscopy across a wide frequency range (10^2–10^6 Hz).
- X-ray diffraction (XRD) for structural confirmation.
Main Results:
- Ag-INTO/PVDF composites exhibited significantly enhanced ε' (~86 at 1 kHz) with a low tanδ (~0.044) for fAg-INTO = 0.5, an ~8-fold increase over pure PVDF.
- Dielectric permittivity (ε') remained nearly independent of frequency over the 10^2–10^6 Hz range.
- Effective medium percolation theory model successfully fitted the experimental ε' data.
- Enhanced ε' was attributed to interfacial polarization at Ag nanoparticle-PVDF and Ag-INTO interfaces, and the high ε' of INTO particles.
- Low tanδ was achieved by inhibiting the formation of a conductive network, preventing direct contact between Ag nanoparticles.
Conclusions:
- Incorporating Ag-INTO hybrid particles into a PVDF matrix is an effective strategy for developing advanced dielectric materials.
- The composites demonstrate a promising balance of high dielectric permittivity and low dielectric loss.
- The findings suggest potential applications in electronic components requiring high dielectric performance.
