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Electromagnetic interference shielding and microwave absorption properties of cobalt ferrite CoFe2O4/polyaniline composite

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Abstract

Improvement of microwave-absorbing materials (MAMs) is the most important research area in various applications, such as in communication, radiation medical exposure, electronic warfare, air defense, and different civilian applications. Conducting polymer, polyaniline doped with para toluene sulphonic acid (PANI-PTSA) as well as cobalt ferrite (CoFe2O4) is synthesized by sol–gel method and intensely blends in different ratios. The characterization of the composite materials, CoFe2O4/PANI-PTSA (CFP1, CFP2, CFP3 and CFP4), was performed by X-ray diffraction (XRD), atomic force microscopy (AFM) and vibrating sample magnetometry (VSM). The microwave-absorbing properties’ reflection loss (dB) and important parameters, such as complex relative permittivity (ε r ′–jε r ″) and complex relative permeability (µ r ′–jµ r ″) were measured in different microwave frequencies in the X-band (8.2–12.4 GHz) region. The composite material CFP3 showed a wider absorption frequency range and maximum reflection loss of − 28.4 dB (99.8% power absorption) at 8.1 GHz and − 9.6 dB (> 90% power absorption) at 11.2 GHz, and so the composite can be used as a microwave absorber; however, it can be more suitable for application in daily life for making cell phones above 9 GHz. Also the results showed that the thicker composites like CFP3 (4 mm) exhibit obviously better EMI SE as compared with the thinner ones (0.19, 0.19, 0.3 mm); this may be related to the low transmission of the EM wave from the composites.

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Authors and Affiliations

  1. Department of Applied Sciences, University of Technology, Baghdad, Iraq

    Mukhils M. Ismail, Sewench N. Rafeeq & Jameel M. A. Sulaiman

  2. College of Dentistry, University of Mosul, Mosul, Iraq

    Jameel M. A. Sulaiman

  3. Materials Science Center, Indian Institute of Technology, Kharagpur, India

    Avinandan Mandal

  4. Key Lab of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Lab of Rubber-Plastics, School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China

    Avinandan Mandal

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  1. Mukhils M. Ismail
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Ismail, M.M., Rafeeq, S.N., Sulaiman, J.M.A. et al. Electromagnetic interference shielding and microwave absorption properties of cobalt ferrite CoFe2O4/polyaniline composite. Appl. Phys. A 124, 380 (2018). https://doi.org/10.1007/s00339-018-1808-x

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