The Electromagnetic Interference Shielding Effectiveness and Dielectric Response of PVDF-nTiO2Nanocomposites Thin Films

Abstract

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 GRAPHICAL ABSTRACT