Enhancement of dielectric properties such as dielectric constant, breakdown voltage and reducing dielectric loss of low dielectric constant polymer matrix using nanofillers are the forefront of the current research. Using minimum amount of nanofillers to enhance dielectric properties significantly is one of the challenging tasks. Here we observed a strong dielectric enhancement in PVDF polymer when combined with small quantity of layered 2D mica crystals in a heterostructure geometry. A PVDF/(mica-PMMA)/PVDF heterostructure layered devices were fabricated using spin coating and transfer techniques, where 2D mica layers were sandwiched between two PVDF layers. We observed 100 to 130% enhancement of dielectric constant when an exfoliated mica is sandwiched between two spin coated PVDF layers. The dielectric breakdown voltage also shows much larger than the pure polymer sample. The loss also decreases significantly with introducing mica layers between two PVDF layers. This shows that the dielectric constant is strongly related to the charge accumulation at the interface of 2D mica layer and polymer layer under applied electric field. The detail dielectric measurements in as a function of broad frequency range 1000 - 10<sup>6 </sup>MHz and temperature from room to 200<sup>o</sup> C will be presented.

High enhancement of dielectric properties in polymer PVDF and 2D mica heterostructure

ACS Fall 2021

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