Enhancement of Electromagnetic Wave Shielding Effectiveness of Carbon Fiber-based Fabrics via Carbon Fiber-Carbon Microcoil Hybrid Formation or H2 Plasma Treatment

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Enhancement of Electromagnetic Wave Shielding Effectiveness of Carbon Fiber-based Fabrics via Carbon Fiber-Carbon Microcoil Hybrid Formation or H2 Plasma Treatment

June 19, 2021 Chemical Science 0

Using a thermal chemical vapor deposition system, carbon fiber-carbon microcoil (CF-CMC) hybrids were formed on carbon fiber (CF)-based fabrics. Although the CF-CMC hybridization reaction improved the shielding effectiveness (SE) values of CF-based nonwoven fabrics (c-NFs), it reduced the electrical conductivities of the nonwoven fabric. Because of the CF-CMC hybrid formation, the SE values of CF-based woven fabrics (c-WFs) were improved by more than twofold across the entire frequency range. This significant improvement was attributed in part to increased electrical conductivity, particularly in the transverse direction to the individual CFs. Because c-NFs are made up of randomly oriented carbon fibers, the SE values of c-NF samples are higher than those of c-WF samples. To improve the SE values of cNFs, H2 plasma treatment was performed. As a result, the SE values of the c-NFs improved significantly across the operating frequency range of 0.04 to 20.0 GHz. The SE values of H2 plasma-treated c-NFs samples were compared to those of c-NFs samples coated with nano-sized Ag particles. Despite the fact that it has a lower surface electrical conductivity, Across the relatively high operating frequency range of 7.0 to 20.0 GHz, H2 plasma-treated c-NFs samples exhibited significantly higher SE than Ag-coated c-NFs samples. The carbon component of H2 plasma-treated c-NFs samples increased significantly more than the oxygen component. The H2 plasma treatment converted the alcohol-type (C-O-H) compounds formed by carbon-oxygen bonds on the surface of the native c-NFs samples into ether-type (C-O-C) compounds. Based on these findings, we proposed a mechanism to explain the SE enhancement observed in H2 plasma-treated c-NFs.

Author (s) Details

Hyun-Ji Kim
Department of Energy and Chemical Engineering, Silla University, Busan 46958, Republic of Korea.

Gi-Hwan Kang
Department of Energy and Chemical Engineering, Silla University, Busan 46958, Republic of Korea.

Sung-Hoon Kim
Department of Energy and Chemical Engineering, Silla University, Busan 46958, Republic of Korea.

Sangmoon Park
Department of Energy and Chemical Engineering, Silla University, Busan 46958, Republic of Korea.

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