Dielectric enhancement in polymer-nanoparticle composites through interphase polarizability

Dielectric measurements on polyimide-oxide nanoparticle composite thin films show a composite dielectric constant (epsilon(composite)) that increased monotonically with increasing oxide content well above the value predicted by Maxwell's rule for dielectric mixtures below the percolation threshold. Above certain volume fractions, the measured epsilon(composite) values were found to exceed the corresponding nanoparticle epsilon such that epsilon(polymer)