Polyaniline/LiNi_0.5La_0.08Fe_1.92O₄ Nanocomposite: A Study of Dielectric and Electric Modulus Spectroscopy

Abstract

Polyaniline(PANI)/LiNi_0.5La_0.08Fe_1.92O₄ nanocomposite was synthesized by an in situ polymerization of aniline in the presence of LiNi_0.5La_0.08Fe_1.92O₄ nanoparticles. The dielectric properties of a PANI/LiNi_0.5La_0.08Fe_1.92O₄ (10 wt% weight ratio of LiNi_0.5La_0.08Fe_1.92O₄ to aniline monomer) nanocomposite were investigated in the frequency range of 10⁶–10⁹ Hz. The dielectric constant (ϵ′) and dielectric loss (ϵ″) were frequency dependent, having relatively high values at low frequency and decreasing with increasing frequency. The values of ϵ′ and ϵ″ of PANI/LiNi_0.5La_0.08Fe_1.92O₄ nanocomposite were found to be lower than those of the pristine PANI. Electric modulus analysis was carried out to understand the electrical relaxation process.

Keywords:

• dielectric properties
• electric modulus
• nanocomposite
• polyaniline

This work was supported by Scientific Research Start-up Foundation of China West Normal University (07B008).