Enhanced electromagnetic interference shielding performance of patterned AgNWs doped MXene films in X-band

Abstract MXene based materials have a high performance in electromagnetic interference shielding. However, designing a MXene-based electromagnetic interference shielding material with broad-band, lightweight, thin thickness properties is still a challenge. In this work, we successfully fabricated patterned MXene films and MXene/silver nanowires films using laser ablation technique, which could effectively boost the shielding efficiency of materials in X-band without adding the thickness and with less weight. As shown in the results, the shielding efficiency of the patterned MXene films increased with the pattern depth, up to 37.7 dB, which is 10% larger than that of un-patterned MXene film. The silver nanowires doped patterned films had the same trend, with a maximum shielding efficiency of 38.4 dB. We attribute this effect to the small interfaces brought by engraving pattern, which can make a growing number of reflections of electromagnetic waves in the material, reduce surface reflection, and enhance the shielding efficiency of MXene. Meanwhile, we verified the enhancement mechanism by simulation. This work provides a feasible strategy to boost electromagnetic shielding efficiency without increasing the thickness and weight of material, which may have a potential application prospect.