Open Access

ARTICLE

Investigation of stable dielectric permittivity with superior EMI shielding capabilities of a multifunctional NiFe₂O₄@MoS₂ nanomaterial

U. Anwar^a,, M. Rafi^b, N. A. Noor^c, S. Mumtaz^d,, Hosam O. Elansary^e

a Institute of Chemical Sciences, Bahauddin Zakariya University, Multan 60000, Pakistan
bDepartment of Physics, University of Wah, Quaid Avenue, Wah Cantt 47040, Pakistan
c Department of Physics, University of Sargodha, 40100, Sargodha, Pakistan
d Department of Chemical and Biological Engineering, Gachon University, 1342 Seongnamdaero, Sujeong-gu, Seongnam-si 13120, Republic of Korea
e Department of Plant Production, College of Food & Agricultural Sciences, King Saud University, P.O. Box 2460, Riyadh 11451, Saudi Arabia

* Corresponding Author:

Chalcogenide Letters 2025, 22(4), 293-311. https://doi.org/10.15251/CL.2025.224.293

Received 01 January 2025; Accepted 04 April 2025;

Abstract

This study presents a multifunctional NiFe₂O₄@MoS₂ nanomaterial synthesized by co-precipitation and hydrothermal methods. The highly magnified Field emission scanning electron microscopic (FESEM) images expose an excellent interconnected network of MoS₂ petals and NiFe₂O₄ cores. NiFe₂O₄@MoS₂ nanomaterial's crystalline arrangement and phase purity are explored using X-ray diffraction (XRD) analysis. A comprehensive analysis of the NiFe₂O₄@MoS₂ nanomaterial, focusing on its dynamic electrical properties across a temperature zone of 183 K to 373 K. The temperature-dependent impedance and modulus plots versus frequency reveal insights into the material’s conduction and relaxation. Electrical characteristics verify the contribution of electroactive regions, such as grains and surfaces, by the use of impedance spectroscopy. An analogous circuit model is used to measure different electrical characteristics. Using an adiabatic small polaron hopping model, the activation energies of bulk (0.32 eV) and various cations (0.30 eV) are estimated. Using Mott's variable range hopping model, the hopping length at the interface is calculated to be between 1.8 and 1.5 Å. Stable dielectric permittivity is explained on the basis of the polarizability of the cations and tangent loss. The NiFe₂O₄@MoS₂ nanomaterial showcases total electromagnetic interference (EMI) shielding effectiveness of 30.6 dBs around the 11GHz frequency range with a thickness of 3 mm.

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Keywords

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