Complex Permittivity and Electromagnetic Interference Shielding Effectiveness of OPEFB Fiber-Polylactic Acid Filled with Reduced Graphene Oxide.

Ismail Ibrahim Lakin,Ibrahim Abubakar Alhaji,Rabaah Syahidah Azis,Zulkifly Abbas

doi:10.3390/ma13204602

Ismail Ibrahim Lakin, Ibrahim Abubakar Alhaji + Show 2 more

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https://doi.org/10.3390/ma13204602

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Journal: Materials	Publication Date: Oct 16, 2020
Citations: 10	License type: CC BY 4.0

Affiliation: Universiti Putra Malaysia

Abstract

This study was aimed at fabricating composites of polylactic acid (PLA) matrix-reinforced oil palm empty fruit bunch (OPEFB) fiber filled with chemically reduced graphene oxide (rGO). A total of 2–8 wt.% rGO/OPEFB/PLA composites were characterized for their complex permittivity using an open-ended coaxial probe (OEC) technique. The shielding efficiency properties were calculated using the measured transmission (S21) and the reflection (S11) coefficient results. All the measurements and calculations were performed in the 8–12 GHz frequency range. The morphological and microstructural study included X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and Fourier transform infrared spectroscopy (FTIR). The results indicated that the incorporation of rGO as filler into the composites enhanced their complex permittivity properties. The composites showed a total shielding efficiency (SET) of about 31.2 dB at a frequency range of 8–12 GHz, which suggests their usefulness for microwave absorption.

Highlights

In this contemporary world of information technology (IT), we are surrounded by telecommunications and electronic devices, and their use is unavoidable
Results for the reduced graphene oxide (rGO) and the rGO/oil palm empty fruit bunch (OPEFB)/polylactic acid (PLA) substrates at various rGO contents
Field Emission Scanning Electron Microscopy results for the rGO and the rGO/OPEFB/PLA substrates at various rGO contents (2%, 4%, and 8% rGO)

Summary

Introduction

In this contemporary world of information technology (IT), we are surrounded by telecommunications and electronic devices, and their use is unavoidable. Electromagnetic interference (EMI) is an unwanted by-product of rapid electronic systems and telecommunication devices This radiation can result in improper operation of other equipment [1,2,3]. These materials attenuate signals by absorbing and/or reflecting the radiation energy [5] Several materials, such as metals, carbon materials (carbon nanotubes, and activated carbons, etc.), and their composites, are excellent candidates for EMI absorbing applications [6,7]. For this purpose, conventional metal shielding materials are used for a long time and serve as the most effective EMI shield. They have several drawbacks, such as being corrosive, heavyweight, complicated processing, and shielding is by reflection, which will minimally contribute to the reduction of EM pollution [8]

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