Structural, optical and dielectric properties of polyaniline-Nio.5 Zno.5Fe2O4 nano-composites

Abstract

Nio.5Zno.5Fe2O4 spinel ferrite was prepared by sol gel method. In situ polymerization method was used to synthesize polyaniline-Nio.5Zno.5Fe2O4 nano-composites having general formula (1-x)ferrite+(x)PANI where x = 0,0.3,0.5,1 (CP,CP1,CP2 and PANI). The effect of structural, optical and dielectric properties of the PANI- Nio.5Zno.5F2O4 nano-composites were investigated. XRD analysis confirmed that the Nio.5Zno.5Fe2O4 particles were successfully dispersed in the PANI matrix with single phase structure. The crystallite size of nano-composites increased with increasing spinel ferrite contents in the PANI matrix due to amorphous structure of PANI. Optical band gaps was calculated by using Tauc relation which found that optical band gradually decreases with the increasing amount of Nio.5Zno.5Fe2O4 in PANI. The dielectric constants (ε′,ε′′), dielectric loss (tanδ) and AC conductivity (Ϭac) were explained as a function of frequency (1kHz to 1MHz) which is described by Maxwell Wagner Model. The spinel ferrite-PANI composite are valuable as microwave absorbers because of their low cost, light weight and flexibility.