Fabrication of capacitor thin film utilizing green polymers and barium strontium titanate nanoparticles

Abstract

Magnesium-doped barium strontium titanate powder with various mole ratio of strontium and magnesium ions (Ba1-x-ySrxMgyTiO3 when x = 0.3, 0.4, 0.5 and y = 0, 0.005, 0.010, 0.020) were prepared by a low-temperature sol-gel method to study their phase formation, frequency-dependent and temperature-dependent dielectric properties. Additionally, barium strontium titanate powder with strontium content of 30 mol.% or Ba0.7Sr0.3TiO3 was incorporated in poly (butylene succinate) (PBS), matrix in various volume fraction of filler in order to improve dielectric properties of polymeric material. The solution mixing method was used to mix each compounds altogether, followed by compression molding to obtain thin-film of 200 µm - 300 µm. Along with the determination of thermal, mechanical and dielectric properties at microwave frequency of PBS-composite. Furthermore, the experimental data of dielectric constant of PBS/BST composite as a function of BST function were predicted with 0-3 connectivity models. The dispersion state of PBS-composite were also investigated by using Scanning Electron Microscope (SEM). Finally, the PBS-composite thin films with good dielectric properties, flexibility, and process ability are possible to be processed as a biodegradable thin film capacitor for high-frequency electronic devices.