Microwave Absorption Performance of Flexible Porous PVDF-MWCNT Foam in the X-Band Frequency Range

Overview

Journal ACS Omega

Publisher American Chemical Society

Specialty Chemistry

Date 2024 Aug 26

PMID 39184473

Authors

Vaishnavi Khade

Madhuri Wuppulluri

Affiliations

Soon will be listed here.

Abstract

Lightweight electromagnetic absorbers made of polymers and multiwall carbon nanotubes (MWCNTs) have attracted a lot of attention because of their potential to shield next-generation electronics devices from electromagnetic radiation without reflecting it back into space. In this research, a flexible foam composed of MWCNTs and polyvinylidene fluoride (PVDF) is developed. This foam is designed to be an electromagnetic shielding material that is both flexible and absorption-dominant, reducing electromagnetic interference. The solvent approach is used to fabricate the PVDF-MWCNT foam. It is discovered that the foam has a porosity of 88.9%. Each cell in the PVDF-MWCNT foam is formed in a porous layered manner. The foam demonstrates a dielectric constant (ϵ ) of around 7.19 and dielectric loss (ϵ ) of 4.46 at 9.96 GHz as calculated from MATLAB using the Nicolson-Ross-Wire algorithm. This developed EM absorber exhibits a high shielding efficiency of 78.46 dB. With an ideal reflection loss of -26.5 dB, this absorber attains the desired outcomes. The electromagnetic shielding performance is supported by calculations of the impedance matching degree, which was found to be 0.54. The PVDF-MWCNT foam displayed absorption-dominant characteristics, with a significantly low shielding due to reflection. This newly developed foam EM absorber has proven itself capable in a variety of commercial and stealth-related applications.

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