Development of Perovskite Oxide Based Dielectric Nanocomposites

Dielectric materials have been developed over a hundred years. Their dielectric performance and deposition process have been significantly improved owing to the recent development of nanotechnology. Nowadays, dielectric nanocomposites have shown very promising dielectric properties for various device applications. Single polymer or ceramic dielectric materials shows limitation in contemporary electronic industry. Therefore, ceramic/polymer nanocomposite has the potential of satisfying the demands of various applications. Polymers usually have high transparency, excellent mechanical flexibility and high breakdown strength. Ceramics have a high dielectric constant, low dielectric loss and high thermal stability. Therefore, by developing ceramic/polymer nanocomposites, ceramic nanoparticles can be uniformly dispersed into polymer matrix with superior dielectric properties. This thesis focuses on the following studies: (a) Synthesis of perovskite oxide nanoparticles (BaTiO3, SrTiO3, BaSrTiO3) by hydrothermal and molten salt methods; (b) fabrication of ceramic/polymer nanocomposite capacitors including PVP/BaTiO3 and PVP/SrTiO3 thin film capacitors; and (c) Measurement and optimization of dielectric properties of fabricated thin film capacitors