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Flexible electromagnetic absorber in X-band using a polymer electrolyte having mixed conduction

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Abstract

Present work is on the synthesis and characterization of polymer nanocomposite (PNC) films consisting of polyethylene oxide (PEO), inorganic salt lithium bis(trifluoromethane)sulfonimidate ([Li][TFSI]), ionic liquid 1-Hexyl-3-methylimidazolium bis(trifluormethyl sulfonyl)imide ([HMIM][TFSI]), MWCNTs, and CoFe2O4 nanoparticles prepared by solution cast method. Inclusion of [Li][TFSI], [HMIM][TFSI], and MWCNTs in the polymer matrix has resulted in an enhancement of the conductivity (which is due to both ions and electrons, i.e., mixed conduction) and dielectric properties of the composite films as evidenced by complex impedance spectroscopy. Synergistic influence of both fillers (MWCNTs, and CoFe2O4) on the shielding effectiveness (SE) has been observed which is attributed to (i) connecting network provided by the CNTs and (ii) magnetic losses provided by the CoFe2O4. Moreover, attenuation of incident electromagnetic waves (frequency range 8.2–12.4 GHz) by absorption has been tuned for an optimum combination of CoFe2O4 and polymer electrolyte with 6 wt% MWCNTs (PECN0). The PNC is found to exhibit the commercially desired SE of ~ 47 dB in X-band.

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Acknowledgments

One of the authors (Anjana), acknowledges CSIR, India for financial support (09/045(1600)/2018-EMR-1). Financial support from Institution of Eminence (Ref. No./IoE/2021/12/FRP), University of Delhi and the Alexander von Humboldt Foundation (through its Research Group Linkage programme) is also gratefully acknowledged. Authors also thank the University of Delhi’s USIC for providing the characterization facilities.

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  1. Department of Physics and Astrophysics, University of Delhi, Delhi, 110007, India

    Anjana, Manoj Kumar Vyas & Amita Chandra

  2. Department of Physics (UIS), Chandigarh University, NH-95, Mohali, Punjab, 140413, India

    Manoj Kumar Vyas

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Anjana, Vyas, M.K. & Chandra, A. Flexible electromagnetic absorber in X-band using a polymer electrolyte having mixed conduction. Journal of Materials Research 38, 2422–2438 (2023). https://doi.org/10.1557/s43578-023-00973-3

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