Electromagnetic wave absorbing characteristics of synthetized barium strontium titanate/polyaniline nanocomposites Free

In this paper, electromagnetic wave absorbing characteristics of electrically conductive composites consisted of polyaniline (PANi) and nanoparticles of barium strontium titanate (BST) is described. The BST nanoparticles were synthesized by the mechanical alloying method and successive particle size reduction steps through high frequency ultrasonic irradiation treatments. Whereas polyaniline was produced by oxidative polymerization processes which allows efficient control of the dielectric properties. Mechanical alloying combined with ultrasonic irradiation treatments has resulted in BST powders with a mean particle size of a few nanometers (less than 100 nm). Such ultra-fine particles of BST were then used to synthesize the BST/PANi nanocomposites with 20:80, 50:50 and 80:20 compositions. The physical properties like particle sizes, dielectric constant, electromagnetic absorption characteristics are investigated by X-Ray Diffractometer, Fourier Transform Infrared, and Vector Network Analyzer. It was found that BST/polyaniline nanocomposite can enhance main properties of the electromagnetic absorber. The high dielectric constant of BST and conductivity of polyaniline support nanocomposite BST/polyaniline as electromagnetic absorber materials.