With the development of communication networks,wireless devices and aerospace industries.Electro-magnetic wave hazards become prevalent.Therefore,it is essential to develop composites with better electromag-netic shielding properties.In this paper,highly conductive three-dimensional(conductivity up to 1.4×104 S·m-1)networked electromagnetic shielding composite films(Ti3C2Tx MXene-based functional composite films)were constructed using MXene(Ti3C2Tx),silver nanowires(AgNWs)and multi-walled carbon nanotubes(MWCNTs)in a bilayer.In particular,the aqueous solutions of 10 mL AgNWs and 15 mL Ti3C2Tx MXene were adsorbed on top of poly(vinylidene fluoride)(PVDF)/MWCNTs composite films by vacuum-assisted filtration(VAF),and the total electromagnetic interference shielding effectiveness(EMI SET)of the Ti3C2Tx MXene-based functional composite film was as high as 69.0 dB,which was 245%higher than that of the commercial standard(20 dB),of which the absorption loss effectiveness(SEA)accounted for 85.1%.It is shown that the main electromagnetic loss mechanism of Ti3C2Tx MXene-based functional composite films is absorption loss,with a specific electromagnetic shielding effectiveness(SSE/t)of up to 2 719.8 dB/(cm-2·g).This work provides structural design and research ideas for the application of novel MXene materials in electromagnetic shielding composites.
Ti3C2Tx MXeneAgNWscomposite filmselectromagnetic shieldingabsorption loss
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