Abstract
Polymer–metal composites with different fillers, such as nanocrystalline nickel (n- Ni ), core shell n- Ni and nickel oxide ( NiO )[n- Ni@NiO ] were prepared under the same processing conditions with polyvinyledene fluoride matrix. The larger value of critical exponents (s and s') and percolation threshold (fc~ 0.30) for n- Ni@NiO composites as compared to n- Ni composites (fc~ 0.07) and a comparable effective dielectric constant (εeff~ 300) with low loss tangent ( t an δ ~ 0.1) at 100 Hz in case of percolative n- Ni@NiO composite was observed. The core shell structure [n- Ni@NiO ] also shows a very high value of εeff~ 6000 with tan δ ~ 8 at 40 Hz. The results have been explained by using boundary layer capacitor effect and the percolation theory. The difference in fcand critical exponents is attributed to NiO insulating layer that gives rise to different extent of continuumness at fcand have been explained with the help of Swiss cheese model.
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