Abstract
Electromagnetic interference (EMI) shielding materials have received considerable attention in recent years. The EMI shielding effectiveness (SE) of materials depends on not only their composition but also their microstructures. Among various microstructure prototypes, porous structures provide the advantages of low density and high terahertz wave absorption. In this study, by using carbonised wood (CW) as a template, 1-mm-thick MAX@CW composites (Ti2AlC@CW, V2AlC@CW, and Cr2AlC@CW) with a porous structure were fabricated through the molten salt method. The MAX@CW composites led to the formation of a conductive network and multilayer interface, which resulted in improved EMI SE. The average EMI SE values of the three MAX@CW composites were > 45 dB in the frequency of 0.6–1.6 THz. Among the composites, V2AlC@CW exhibited the highest average EMI SE of 55 dB.
Highlights
With the rapid development of terahertz (THz) technology, especially the use of THz band as the next-generation (6G) communication band, THz shielding materials are urgently required to prevent electronic device malfunctions resulting from signal crosstalk and to protect people from electromagnetic pollution
A MAX@carbonised wood (CW) composite (Ti2AlC@CW, V2AlC@CW, and Cr2AlC@CW) with a porous structure was fabricated through the in-situ growth of MAX phase coatings on CW in a molten salt bath
The composition of CW and MAX@CW was confirmed through X-ray diffraction (XRD) and Raman spectra
Summary
With the rapid development of terahertz (THz) technology, especially the use of THz band as the next-generation (6G) communication band, THz shielding materials are urgently required to prevent electronic device malfunctions resulting from signal crosstalk and to protect people from electromagnetic pollution. Various conductive materials are integrated into a CW template to obtain functional composites with an improved EMI SE [21]. In this study, we used CW as the template to design a wood-based conductive composite with a 3D porous structure as a THz shielding material.
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