Improved Electromagnetic Interference Shielding Response of Polyaniline Containing Magnetic Nano-ferrites

  • Sumit Kumar
  • Anil Ohlan
  • Prashant Kumar
  • Vivek VermaEmail author
Original Paper


Improvement of electromagnetic interference (EMI) shielding materials with miniaturization of devices is an important area of research in various applications like communication, electronic warfare, defense, and different civilian applications. Nano-crystalline ferrite, MFe2O4 (M = Ni, Zn, and Co), powders have been synthesized by sol-gel citrate nitrate precursor method. The crystalline size of samples was found in the range of 20–45 nm as analyzed by XRD and TEM analysis. Polyaniline/ferrite nano-composites with 50 wt% were synthesized by mechanical blending. The structural and magnetic properties of the nano-particles were characterized by using Rietveld analysis of powder X-ray diffraction and vibrating sample magnetometer (VSM) respectively. Using the Rietveld refinement, the goodness of fit, interatomic distance, Bragg contribution, and R factors have been determined. Ferrites and their nano-composites, under applied magnetic field up to 20 KOe, exhibited the hysteresis loops of ferromagnetic nature with maximum saturation magnetization of 51.68 emu/g shown by CoFe2O4. The electromagnetic shielding parameters (various shielding effectiveness and reflection loss) and microwave absorbing properties were measured in X band frequency region (8.2–12.2 GHz). Nano-composites show promising and enhanced EMI shielding behavior with overall highest SE value of 52 dB shown by CoFe2O4 composite.


Electromagnetic interference Nano-composites Microwave absorption Sol-gel 



Authors are thankful to Physics Department, Hindu College, University of Delhi and Head, Department of Physics and Astrophysics, University of Delhi. We acknowledge the University Science Instrumental Centre (USIC), Prof. Vinay Gupta, University of Delhi and National Physical Laboratory (NPL), New Delhi, for the characterization facilities and their valuable suggestions regarding the present work.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Sumit Kumar
    • 1
    • 2
  • Anil Ohlan
    • 3
  • Prashant Kumar
    • 4
  • Vivek Verma
    • 1
    Email author
  1. 1.Department of Physics, Hindu CollegeUniversity of DelhiNew DelhiIndia
  2. 2.Department of Physics and AstrophysicsUniversity of DelhiNew DelhiIndia
  3. 3.Department of PhysicsM. D. UniversityRohtakIndia
  4. 4.AcSIR, National Physical Laboratory CampusNew DelhiIndia

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