Abstract :
[en] This study presents a novel investigation of the impact of multiwalled carbon nanotube (CNT) on the microstructure and electromagnetic shielding properties of polyurethane (PU) foams across an exceptional ultra-wideband frequency range, from 5.85 GHz to 330 GHz. The microstructure results show that the CNT formed an interconnected and well-distributed network on the PU surface. In addition, increasing CNT content from 1 wt.% to 11.2 wt.% significantly enhanced the total shielding effectiveness (SET) by approximately four times over the whole frequency range. The absorption is identified as the main mechanism contributing to the SET performance of our 2.4 mm-thick foamed composite samples, representing >98 % of the SET above 40 GHz and up to 330 GHz. Hence, the corresponding absorption level achieved in this range is 13 – 45 dB. Our samples exhibit significant potential for electromagnetic interference shielding applications since they meet the standard commercial requirements.
Funding text :
This work was performed in the frame of the UP_Plastics project co-funded by the European Union and the Walloon Region as part of the FEDER 2021\u20132027 Program. The acquisition of the J\u2013band measuring equipment was funded by the FNRS convention no U.N046.22, \u201COn-wafer measurement of electromagnetic phenomena in materials, devices and circuits in D-band (110\u2013170 GHz)\u201D.The authors thank Pascal Simon and Beno\u00EEt Hubert from the Welcome technological platform of UCLouvain for their great support in the measurements of CNT-PU samples. Beno\u00EEt Hubert designed and fabricated the 3D-printed holders of D and J bands frequency extenders. The authors also thank Delphine Magnin from IMCN of UCLouvain for conducting SEM characterization. The works of I. Huynen and C. Detrembleur as Research Directors are funded by the National Fund for Scientific Research (FNRS, Belgium).The authors thank Pascal Simon and Beno\u00EEt Hubert from the Welcome technological platform of UCLouvain for their great support in the measurements of CNT-PU samples. Beno\u00EEt Hubert designed and fabricated the 3D-printed holders of D and J bands frequency extenders. The authors also thank Delphine Magnin from IMCN of UCLouvain for conducting SEM characterization. The works of I. Huynen and C. Detrembleur as Research Directors are funded by the National Fund for Scientific Research (FNRS, Belgium) .This work was performed in the frame of the UP_Plastics project co-funded by the European Union and the Walloon Region as part of the FEDER 2021\u20132027 Program. The acquisition of the J\u2013band measuring equipment was funded by the FNRS convention no U.N046.22 , \u201COn-wafer measurement of electromagnetic phenomena in materials, devices and circuits in d -band (110\u2013170 GHz)\u201D.
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