Study of Improved Dielectric & Conducting Pro...

Study of Improved Dielectric & Conducting Properties of PVDF based Flexible Inorganic Oxide Polymer Nanocomposites

Author Name : Debabrata Bhadra

ABSTRACT

Poly-vinylidene fluoride (PVDF) polymer composites comprise of potassium (K) and titanium (Ti) co-doped nickel oxide (NiO) (abbreviated as KTNO-A: K_0.05Ti_0.02Ni_0.93O and KTNO-B: K_0.05Ti_0.05Ni_0.90O) with different K/Ti stoichiometric ratios were prepared using hot-molding process. The dielectric permittivity of two of PVDF/ KTNO percolative (percolation threshold ~0.40 vol% both for KTNO-A and KTNO-B) composites were studied over a wide temperature and frequency ranges. The composite with K_0.05Ti_0.02Ni_0.93O (KTNO-A) filler exhibited a high value of effective dielectric permittivity (ε_eff > 400 at 1 kHz). The result could be attributed to a different physical characteristic of the KTNO fillers, which is from the change of composition, dc conductivity and microstructure of both KTNO fillers. Additionally such a high volume fraction still retain the ferroelectric behavior (P_s=4 µC/Cm²) can made such composites as potential candidate for flexible capacitor as well as printing circuit boards.