Influence of carbon fiber additions on the electromagnetic wave shielding characteristics of CNT- cement composites

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This study examined the synergistic effect of carbon fiber (CF) addition on the electromagnetic wave shielding characteristics of carbon nanotube (CNT)-cement composites. Effect of the amount and length of CF on the electrical conductivity, electromagnetic interference (EMI) shielding effectiveness (SE), and complex permittivity of the composites were systematically investigated. The electrical conductivity was determined by means of a digital multimeter, and a network analyzer was used to measure the EMI SE and complex permittivity of the composites in the frequency range of 0.1 to 18 GHz. The electrical conductivity and complex permittivity of the composites incorporating 3 mm CF or 6 mm CF were shown to be proportional to the CF content, while the effect of CF length on the EMI SE was more pronounced as the CF length increased from 0.1 mm (aspect ratio 14) to 3 mm (aspect ratio 417). Enlargement of the aspect ratio of CF led to the enhancement of electrical conductivity and absorption loss of the composites, attributing to a notable increase in the SE.
Publisher
ELSEVIER SCI LTD
Issue Date
2021-02
Language
English
Article Type
Article
Citation

CONSTRUCTION AND BUILDING MATERIALS, v.269, pp.121238

ISSN
0950-0618
DOI
10.1016/j.conbuildmat.2020.121238
URI
http://hdl.handle.net/10203/280511
Appears in Collection
CE-Journal Papers(저널논문)
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