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Synthesis, charge transport studies, and microwave shielding behavior of nanocomposites of polyaniline with Ti-doped γ-Fe2O3

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Abstract

This article reports the synthesis, charge transport studies, and microwave shielding properties of polyaniline–Ti-doped γ-Fe2O3 nanocomposite. The composite has been prepared by the in situ chemical oxidative polymerization using dodecylbenzenzesulfonic acid as a dopant. These resulting polymer composites have been found thermally stability up to 260 °C with magnetization value of ~10 emu/g. The temperature dependence of electrical conductivity reveals the applicability of Mott’s 3D-VRH model. The composites has shown the shielding effectiveness of 35.64–45.20 dB (>99.99% attenuation) in 12.4–18 GHz (Ku-Band) frequency range. The enhancement of SE has been due to combination of dielectric and magnetic losses leading to decrease in skin depth increase in total (σT) conductivity and better matching of input impedance.

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Acknowledgements

Authors wish to thank Director NPL for his keen interest in the work. Authors are also thankful to Dr. Rashmi for XRD patterns, Dr. Renu Pasricha for HRTEM images and Dr. R.K. Kotnala for doing the magnetization measurements of the samples. One of the authors Anoop Kumar S is thankful to UGC for providing junior research fellowship.

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Authors and Affiliations

  1. Polymeric & Soft Materials Section, National Physical Laboratory (CSIR), Dr. K. S. Krishnan Road, New Delhi, 110 012, India

    S. Anoop Kumar, Avanish Pratap Singh, Parveen Saini & S. K. Dhawan

  2. Department of Applied Sciences, Faculty of Engineering & Technology, Jamia Millia Islamia, New Delhi, 110025, India

    S. Anoop Kumar & Fehmeeda Khatoon

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  1. S. Anoop Kumar
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  2. Avanish Pratap Singh
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  3. Parveen Saini
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  5. S. K. Dhawan
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Correspondence to S. K. Dhawan.

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Anoop Kumar, S., Singh, A.P., Saini, P. et al. Synthesis, charge transport studies, and microwave shielding behavior of nanocomposites of polyaniline with Ti-doped γ-Fe2O3 . J Mater Sci 47, 2461–2471 (2012). https://doi.org/10.1007/s10853-011-6068-5

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