Synthesis, Characterization and Dielectric Behavior of Polyaniline/Ni0.5Zn0.5Fe2O4 Nanocomposites

• Published in: Macromolecular symposia. 2016-03, Vol.361 (1), p.24-29
• Main Authors: Madhu, B. J., Kiran, T., Gurusiddesh, M., Shruthi, B.
• Format: Article
• Language: English
• Subjects: conducting polymers; Dielectric properties; electron hopping model; Nanocomposites; Nanoparticles; polyaniline; Scanning electron microscopy; Spectrum analysis
• ISSN: 1022-1360; 1521-3900
• DOI: 10.1002/masy.201400265

Summary A conducting polymer, polyaniline (PANI)/Ni0.5Zn0.5Fe2O4 nanocomposites were synthesized by a simple and inexpensive one‐step in‐situ polymerization of Aniline monomer with Ni0.5Zn0.5Fe2O4 nanoparticles, where Ni0.5Zn0.5Fe2O4 nanoparticles were prepared via simple solution combustion method using stoichiometric composition of nickel nitrate, zinc nitrate and ferric nitrates as oxidizers and urea as a fuel. PANI/Ni0.5Zn0.5Fe2O4 nanocomposites were characterized by X‐ray diffraction (XRD) analysis, Fourier transform infrared (FTIR) spectroscopy, Scanning electron microscopy (SEM), Energy dispersive X‐ray (EDX) spectroscopy and Thermal gravimetric‐differential thermal analysis (TG‐DTA). Frequency dependence of dielectric constant (ϵ′), dielectric loss tangent (tanδ) and a. c. conductivity (σac) studies have been undertaken on the PANI/Ni0.5Zn0.5Fe2O4 nanocomposites in the frequency range 100 Hz–5 MHz at room temperature. Dielectric properties such as dielectric constant (ϵ′) and dielectric loss tangent (tanδ) are found to decrease with the increase in the frequency. Further, a. c. conductivity (σac) of the PANI/Ni0.5Zn0.5Fe2O4 nanocomposites was found to increase with an increase in the frequency. Observed variation in the a. c. conductivity with the frequency has been understood on the basis of electron hopping model.