MWCNT Coated Free-Standing Carbon Fiber Fabric for Enhanced Performance in EMI Shielding with a Higher Absolute EMI SE

Sudesh Pothupitiya Gamage,Cheol-Min Yang,Hyun Kim,Kihun Yang,Jai Moon,Ramanaskanda Braveenth,Kanthasamy Raagulan,Kyu Chai,Yun Lee

doi:10.3390/ma10121350

Sudesh Pothupitiya Gamage, Cheol-Min Yang + Show 7 more

Open Access

https://doi.org/10.3390/ma10121350

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Abstract

A series of multi-walled carbon nanotube (MWCNT) coated carbon fabrics was fabricated using a facile dip coating process, and their performance in electrical conductivity, thermal stability, tensile strength, electromagnetic interference (EMI) and shielding effectiveness (SE) was investigated. A solution of MWCNT oxide and sodium dodecyl sulfate (SDS) in water was used in the coating process. MWCNTs were observed to coat the surfaces of carbon fibers and to fill the pores in the carbon fabric. Electrical conductivity of the composites was 16.42 S cm−1. An EMI shielding effectiveness of 37 dB at 2 GHz was achieved with a single layer of C/C composites, whereas the double layers resulted in 68 dB EMI SE at 2.7 GHz. Fabricated composites had a specific SE of 486.54 dB cm3 g−1 and an absolute SE of approximately 35,000 dB cm2 g−1. According to the above results, MWCNT coated C/C composites have the potential to be used in advanced shielding applications such as aerospace and auto mobile electronic devices.

Highlights

Electromagnetic interference (EMI) is a radiated electromagnetic signal-intrusion generated by an external source which can affect and perturb the function of nearby electronic equipment such as circuits
NCF is madefeatures of carbon fibers (CF) and the fibers consist of cracks annular gaps on Facility (NCF)s were characterized using
All the composites showed less than 10%

Summary

Introduction

Electromagnetic interference (EMI) is a radiated electromagnetic signal-intrusion generated by an external source which can affect and perturb the function of nearby electronic equipment such as circuits. EMI can arise from various sources and devices that distribute or process any form of electrical energy are a major source of EMI radiation [1]. The rapid development of modern electronic products which results in abundant use of electronic devices and highly integrated circuits, generate significant amounts of electromagnetic radiation, producing adverse effects on living beings as well as highly sensitive, precision electronic equipment. EMI radiation is especially harmful to human beings. When humans are exposed to electromagnetic (EM) radiation, it leads to heat buildup in sensitive tissues inside the body such as eyes and veins [2].

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