The Electromagnetic Interference Shielding Effectiveness and Dielectric Response of PVDF-nTiO2Nanocomposites Thin Films
DOI:
https://doi.org/10.48048/tis.2022.3046Keywords:
Ferroelectric polymer, PVDF-nTiO2, EMI shielding, Dielectric constant, Thin films, NanocompositeAbstract
This paper presents electromagnetic interference (EMI) shielding effectiveness (SE) and dielectric response of Polyvinylidene Fluoride (PVDF) and PVDF-Titanium dioxide (nTiO2) nanocomposite thin films. nTiO2 nanoparticles were synthesized by the combustion method using urea as fuel. PVDF and PVDF-nTiO2nanocomposite thin films of different wt% of TiO2as fillers in the PVDF matrix were prepared using the solvent evaporation method. The synthesized nanocomposite thin films were characterized by XRD, FTIR, and SEM. The EMI-SE was studied in the frequency range 0.5 - 8GHz and dielectric response in 10Hz - 8MHz at room temperature. The EMI-SE shows up and down valleys in S-Band with an average variation of ⁓28 and ⁓35 dB at 2 and 4GHz respectively and remains stable in C- Band agreeing with existing literature. The dielectric constant of PVDF-nTiO2 nanocomposite thin films decreases with an increase in frequency and anomaly for 10wt% of nTiO2 fillers in the PVDF matrix at standard frequency.
HIGHLIGHTS
- TiO2 nanoparticles were synthesized by the combustion method using urea as fuel
- PVDF and PVDF-nTiO2 composites were prepared using the solvent evaporation technique
- The addition of nanoparticles to the PVDF polymer has varied the EMI shielding and dielectric properties of nanocomposite thin films
- The observed variations in EMI-SE and dielectric constant with frequency are discussed in terms of the dynamics of domain switching
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