Absorption-Dominant EMI Shielding Materials with Conductivity Gradient and Porous Structures Using MXene Nanoflake-Based FDM Printable Filaments

Traditional methods for producing EMI shielding materials often face limitations in terms of structure, uniformity, and adaptability. To address these issues, 3D printing (3DP) methods offer customizable electrical conductivity and complex structural designs. However, commercially available options for building such structures are limited. Recently, MXene nanoflake-based EMI shielding materials have demonstrated excellent performance due to their superior properties. Thus, developing composite filament structures for 3DP using MXene nanoflakes is essential to realize high-performance EMI shielding materials.<br/>In this study, we developed a method for fabricating FDM (Fused Deposition Modeling) printable filaments with various conductivities based on MXene nanoflakes. These filaments were used to create high-performance EMI shielding materials with conductivity gradient and porous structures, achieving absorption-dominant shielding. By precisely controlling the conductivity and porosity, we developed EMI shielding materials with a Shielding Effectiveness (SE) of over 65 dB and an absorption rate of 75% in the X-band. Compared to previously reported 3D-printed EMI shielding materials, our method offers significantly higher performance and uniformity.<br/>This method is highly effective for fabricating absorption-based shielding materials applicable to various structures and for developing uniform and reproducible EMI shielding materials. The development of MXene-based FDM printable filaments and the gradient conductivity and porosity structures printed using them provide new possibilities for the fabrication of high-performance EMI shielding materials. This method represents a significant advancement in the field of EMI shielding, offering a versatile and effective solution for various applications.