Complex dielectric behavior of doped polyaniline conducting polymer at microwave frequencies using time domain reflectometry


  • D.R. Bijwe Dept. of Physics, Institute of Science, Mumbai-32
  • S.S. Yawale Presently working at Sydenham College of Commerce and Economics, Churchgate, Mumbai-400 020.
  • A.C. Kumbharkhane School of Physical Sciences, Swami Ramanand Tirth Marathwada University, Nanded (India)
  • H. Peng Department of Optoelectronics, East China Normal University, Shanghai (China).
  • D.S. Yawale Department of Physics, Shri Shivaji Science College, Amravati, Maharashtra (India).
  • S.P. Yawale Department of Physics, Govt. Vidarbha Institute of Science and Humanities, Amravati-444 604, Maharashtra (India). Presently working at The Institute of Science, 15 Madam Cama Road, Fort, Mumbai-400 032 and corresponding author.



Dielectric constant, relaxation time, polyaniline (PAni) and SnO2, PAni-SnO2nano-composite, Microwave measurements, TDR


Nano size Tin Oxide is prepared in the laboratory from SnCl4 and ammonia solution. The polyaniline (PAni) conducting polymer is synthesized by chemical oxidation method using ammonium persulphate as oxidizing agent. The PAni-SnO2 composite was prepared by insitu method. Scanning electron microscopy (SEM) results confirm the particle size of SnO2 in the range of 30-48 nm.   Dielectric  behavior  of  nanocomposite  of  PAni-SnO2 was  studied  in the frequency range 0.01- 20 GHz at -5,0,5,10,15,20 and  25oC. The dielectric constant (real part ε׳) and dielectric loss (imaginary part ε״) have been evaluated. The relaxation time (τ, τo, and τ1) are calculated. The relaxation time was found to be of the order of ps. The dielectric properties of the solids in the form of powders may be useful in understanding the structural behavior of particles in an alternating field. These studies may also be used to formulate models for predicting the dielectric properties. The microwave absorbing property is decided from the dielectric loss of the material. It is observed that the PAni-SnO2 composite can be a good electromagnetic shielding material.

Author Biography

D.R. Bijwe, Dept. of Physics, Institute of Science, Mumbai-32

Professor (Full) and Head

Department of Physics


Additional Files



How to Cite

Bijwe, D.R., S.S. Yawale, A.C. Kumbharkhane, H. Peng, D.S. Yawale, and S.P. Yawale. 2019. “Complex Dielectric Behavior of Doped Polyaniline Conducting Polymer at Microwave Frequencies Using Time Domain Reflectometry”. Revista Mexicana De Física 65 (6 Nov-Dec):590-600.