Optimization of EMI shielding performance of MXene‐epoxy nanocomposite coatings: MXene Loading and thickness study

Abstract The burgeoning prevalence of electronic devices necessitates effective control of electromagnetic interference (EMI) to prevent device malfunctions and safeguard environmental and human health. MXene, with its unique combination of high electrical conductivity and large surface area, emerges as a promising candidate for EMI shielding applications. This study investigates the influence of MXene nanoparticle concentration and coating thickness on the EMI shielding effectiveness (EMI SE) of epoxy‐MXene nanocomposite coatings. Ti3C2 MXene was synthesized and incorporated into epoxy matrices at varying loadings (3–30 wt.%) to fabricate coatings with thicknesses of 100 μm and 1 mm. Results demonstrate a significant enhancement in EMI SE, ranging from 5 to 39 dB in the X‐band (7.5–13 GHz), with increasing MXene content. Moreover, the mechanical properties of the epoxy matrix were observed to improve with the addition of MXene, particularly at higher concentrations. Notably, while low MXene loadings initially resulted in a slight reduction in Young's modulus, subsequent increases in MXene content led to substantial enhancements in both modulus and strength. Dynamic mechanical analysis revealed a trend towards increased elastic behavior and reduced energy dissipation with higher MXene content. This study highlights the potential of MXene‐based epoxy composites as high‐performance EMI shielding materials with tailored mechanical properties. Highlights Successful MXene synthesis confirmed by x‐ray diffraction. Enhanced EMI shielding in MXene‐epoxy composites. Thicker composites improved SE A and SE T . Higher MXene content generally improved EMI shielding. MXene‐reinforced composites offer promising potential for EMI shielding.