Electromagnetic Characterization of a Multiwalled Carbon Nanotubes-Silver Nanoparticles-Reinforced Polyvinyl Alcohol Hybrid Nanocomposite in X-Band Frequency.

Autor: Yusof Y; Nanotechnology and Catalysis Research Center (NANOCAT), University of Malaya, Lembah Pantai, Kuala Lumpur 50603 Malaysia., Moosavi S; Nanotechnology and Catalysis Research Center (NANOCAT), University of Malaya, Lembah Pantai, Kuala Lumpur 50603 Malaysia., Johan MR; Nanotechnology and Catalysis Research Center (NANOCAT), University of Malaya, Lembah Pantai, Kuala Lumpur 50603 Malaysia., Badruddin IA; Research Center for Advanced Materials Science (RCAMS), King Khalid University, P.O. Box 9004, Abha 61413, Asir, Kingdom Saudi Arabia.; Mechanical Engineering Department, College of Engineering, King Khalid University, Abha 61413, Asir, Kingdom Saudi Arabia., Wahab YA; Nanotechnology and Catalysis Research Center (NANOCAT), University of Malaya, Lembah Pantai, Kuala Lumpur 50603 Malaysia., Hamizi NA; Nanotechnology and Catalysis Research Center (NANOCAT), University of Malaya, Lembah Pantai, Kuala Lumpur 50603 Malaysia., Rahman MA; Nanotechnology and Catalysis Research Center (NANOCAT), University of Malaya, Lembah Pantai, Kuala Lumpur 50603 Malaysia., Kamangar S; Mechanical Engineering Department, College of Engineering, King Khalid University, Abha 61413, Asir, Kingdom Saudi Arabia., Khan TMY; Mechanical Engineering Department, College of Engineering, King Khalid University, Abha 61413, Asir, Kingdom Saudi Arabia.
Jazyk: angličtina
Zdroj: ACS omega [ACS Omega] 2021 Feb 03; Vol. 6 (6), pp. 4184-4191. Date of Electronic Publication: 2021 Feb 03 (Print Publication: 2021).
DOI: 10.1021/acsomega.0c04864
Abstrakt: This study presents the electromagnetic (EM) characterization of a multiwalled carbon nanotubes (MWCNT)-silver nanoparticles (AgNP)-reinforced poly(vinyl alcohol) (PVA) hybrid nanocomposite fabricated via the solution mixing technique. Primarily, the structure and morphological properties of the PVA/MWCNT-AgNP hybrid nanocomposite are confirmed by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The complex permittivity (ε*) and permeability (μ*), as well as the electromagnetic scattering parameters are measured using a PNA network analyzer equipped with X-band waveguide. The results showed an enhanced permittivity (ε' ≈ 25) value of the hybrid nanocomposite in the frequency range of 8-12 GHz. However, the permeability decreased to almost zero (μ' ≈ 0.4) since the inclusion of AgNP with an average particle size of 40 nm is not susceptible to magnetization and causes higher magnetic losses (tan δ μ ) than dielectric losses (tan δ ε ). Remarkably, the hybrid nanocomposite reduced transmission of electromagnetic (EM) wave by nearly 60% in comparison to PVA/MWCNT. This is attributed to the enhanced absorption and reflection at the nanotubes, and metal-dielectric interfaces have induced multiple internal reflections owing to the porous structure of the nanocomposite. The prospect of the PVA/MWCNT-AgNP hybrid nanocomposite is favorable as a thin absorbing material for EM shielding applications.
Competing Interests: The authors declare no competing financial interest.
(© 2021 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
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