期刊
MOLECULES
卷 27, 期 17, 页码 -出版社
MDPI
DOI: 10.3390/molecules27175392
关键词
lyocell; carbon fabric; electrical conductivity; electromagnetic interference shielding materials
资金
- National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2020R1I1A1A01072906]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2016R1A6A1A03012069]
Lyocell fabric, after carbonization, exhibited enhanced electrical conductivity and electromagnetic interference (EMI) shielding effectiveness (SE), making it a promising eco-friendly substitute for EMI shielding materials.
Lyocell is a biodegradable filament yarn obtained by directly dissolving cellulose in a mixture of N-methylmorpholine-N-oxide and a non-toxic solvent. Therefore, herein, lyocell fabrics were employed as eco-friendly carbon-precursor substitutes for use as electromagnetic interference (EMI) shielding materials. First, a lyocell fabric treated with polyacrylamide via electron beam irradiation reported in a previous study to increase carbon yields and tensile strengths was carbonized by heating to 900, 1100, and 1300 degrees C. The carbonization transformed the fabric into a graphitic crystalline structure, and its electrical conductivity and EMI shielding effectiveness (SE) were enhanced despite the absence of metals. For a single sheet, the electrical conductivities of the lyocell-based carbon fabric samples at the different carbonization temperatures were 3.57, 5.96, and 8.91 S m(-1), leading to an EMI SE of approximately 18, 35, and 82 dB at 1.5-3.0 GHz, respectively. For three sheets of fabric carbonized at 1300 degrees C, the electrical conductivity was 10.80 S m(-1), resulting in an excellent EMI SE of approximately 105 dB. Generally, EM radiation is reduced by 99.9999% in instances when the EMI SE was over 60 dB. The EMI SE of the three lyocell-based carbon fabric sheets obtained at 1100 degrees C and that of all the sheets of the sample obtained at 1300 degrees C exceeded approximately 60 dB.
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