Excellent electromagnetic interference shielding characteristics of a unidirectionally oriented thin multiwalled carbon nanotube/polyethylene film

0532711 - GLÚ 2021 RIV NL eng J - Journal Article
Chikyu, N. - Nakano, T. - Kletetschka, Günther - Inoue, Y.
Excellent electromagnetic interference shielding characteristics of a unidirectionally oriented thin multiwalled carbon nanotube/polyethylene film.
Materials and Design. Roč. 195, October (2020), č. článku 108918. ISSN 0264-1275. E-ISSN 1873-4197
Institutional support: RVO:67985831
Keywords : Multiwalled carbon nanotube * Oriented CNT/PE composite film * Electromagnetic interference shielding * Microstrip line * Radio wave absorption
OECD category: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Impact factor: 7.991, year: 2020
Method of publishing: Open access
https://www.sciencedirect.com/science/article/pii/S0264127520304524

In this study, we synthesized oriented multiwalled carbon nanotube (CNT)/polyethylene (PE) composite films and investigated their electromagnetic interference (EMI) shielding properties. The oriented CNT sheet structure was prepared by stacking CNT webs produced by a dry spinning technique with a CNT forest. In a near-field EMI attenuation measurement by a microstrip line method, composite films with a CNT fraction higher than 2 wt% showed a high attenuation that exceeded 50 dB at 10 GHz. This high attenuation was due to the enhancedmagnetic anisotropy of the oriented CNTs and the encapsulated catalyst-derived cementite nanoparticles. This is the first report of highmagnetic anisotropy in an oriented CNT structure for noise attenuation in a transmission line. In a far-field EMI shielding measurement by a coaxial tube method, the EMI shielding effectiveness (SE) significantly increased as the number of CNTweb layers increased. A CNT/PE filmwith a high CNT fractionwas found to have a high specific EMI SE of 0.6 dB/μm. The oriented CNT/PE composite film has great potential as a promising EMI material that demonstrates high shielding efficiency performance with low CNT loading.
Permanent Link: http://hdl.handle.net/11104/0311174