Synergistic effect of conducting and insulating fillers in polymer nanocomposite films for attenuation of X-band
2019
Vyas, Manoj Kumar | Chandra, Amita
Nanocomposite films comprising of ion-conducting polymer electrolyte, multi-walled carbon nanotubes (MWCNT) as the electron-conducting network and ceramic (BaTiO₃) as ferroelectric nanofiller have been synthesised for electromagnetic shielding application. XRD and dielectric studies of the synthesised BaTiO₃ nanoparticles show a tetragonal structure and ferroelectric nature. The incorporation of nanofillers (MWCNT and BaTiO₃) in the polymer electrolyte enhances the conductivity and dielectric property of the nanocomposites. Polymer nanocomposites with 7.5 wt% of BaTiO₃ nanoparticles have exhibited the highest shielding effectiveness (SET) ~ 81 dB in the X-band (8–12 GHz). This enhancement in SE can be attributed to the (1) formation of micro-capacitors and interconnected network provided by MWCNTs, (2) spontaneous polarisation of BaTiO₃ and its volumetric effect on the polymer nanocomposites and (3) leakage current due to the ions of the electrolyte which results in dielectric loss.
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