Microstructural analysis of polyimide-based nanocomposite with BaTiO 3 :Eu nanoceramics using high and low positron annihilation techniques

This study investigates the microstructural properties of polyimide-based nanocomposites filled with Ba₀.₉₅Eu₀.₀₅TiO₃ (BETO) nanoceramics using advanced positron annihilation in fast and slow modes. The addition of BETO nanoceramics introduces unique free volume characteristics and defect states, which are critical to increasing the optical and structural performance of the nanocomposites. It explores the relationship between nanostructure, free volume distributions, and optical properties, demonstrating the potential of these materials for advanced optoelectronic applications. The results of positron annihilation and Doppler broadening spectroscopes reveal crucial insights into the nanocomposites' porosity, free volume distribution, defect states, and their implications for optical applications. The AFM and UV-Vis results demonstrate that BETO nanoceramics enhance polyimide matrix's structural uniformity and optical properties, making them highly suitable for advanced optoelectronic applications.