Thin and thick BaTiO₃-polymer nanocomposite dielectric films were prepared using BaTiO₃ nanoparticles and Poly methyl methacrylate (PMMA). The cubic BaTiO3 (~30-60nm) and tetragonal BaTiO3 (~120nm) synthesized via hydrothermal route were used as nanofillers. The high dielectric constant of 9 was achieved for the films of thickness in the range of 150-300nm, which corresponds to 30-40 nF/cm². The dissipation factor of the PMMA composite film was as low as 0.04 at 10⁴ Hz. Thick films of 16.3 µm thickness were prepared via wet application method and tested for their capacitance and dielectric properties in the frequency range of 10-100 KHz for cubic and tetragonal BaTiO₃. The BaTiO₃ particles were dispersed homogeneously in the films at lower filler loading. The homogenous distribution of BaTiO₃ achieved by surface functionalization of BaTiO₃ nanoparticles and use of tetragonal BaTiO₃ resulted in the improvement of their electric properties in thick and thin films.

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