Enhanced electromagnetic shielding effectiveness of MWCNT/zinc-doped nickel ferrite nanocomposites. Issue 4 (15th February 2022)

• Record Type: Journal Article
• Authors: Chahar, Meenu; Dabas, Samiksha; Thakur, O.P.
• Is Part Of: Ceramics international. Volume 48:Issue 4(2022)
• Page Start: 5352
• Page End: 5360
• Publication Date: 2022-02-15
• Subjects: EMI shielding -- Reflection loss -- Ferromagnetic -- Permittivity -- Permeability; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.11.078
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Nano-composites of MWCNTs and Ni0.5 Zn0.5 Fe2 O4 were synthesized by two different methods i.e. co-precipitation (CM) and physical-mixing (PM). Properties of synthesized materials were studied by various analytical equipments/techniques viz. X-ray diffraction (XRD), Raman spectroscopy, scanning and transmission electron microscopy (SEM and TEM), UV–visible spectroscopy and N5230C vector network analyzer (VNA). The XRD and Raman Spectroscopy confirmed the crystalline phase formation of NZF nano-particles and hybrid NZF/MWCNT nano-composites. The FESEM and TEM images revealed hexagonal flake-like structure of NZF deposited on MWCNTs. The energy band gap of NZF, PM and CM was obtained to be 1.9 eV, 1.3 eV and 1.1 eV respectively. The Electromagnetic interference performance of Ni0.5 Zn0.5 Fe2 O4 /MWCNTs nano-composite are reported in the manuscript. The dielectric parameters and EMI shielding effectiveness of nano-materials were carried out by Vector Network Analyzer in the X-band frequency region. The reflection loss (RL) was observed to be maximum with a value of −51.2 dB for PM sample at 11.2 GHz. Total shielding effectiveness of 40.1 dB was observed for CM nano-composite in X-band in frequency range 8.2 GHz–12.4 GHz and thus, these composite materials are good for wider applications in electromagnetic absorption devices.