Lightweight multi-walled carbon nanotubes/acrylonitrile-styrene-acrylate composite structure fabricated via 3D printing technology for electromagnetic interference shielding

The rapid development of communication technologies has raised growing public health concerns regarding electromagnetic wave pollution, driving urgent demands for high-performance electromagnetic interference (EMI) shielding material structures. However, traditional manufacturing techniques face limitations in fabricating the complex architectures required for efficient EMI shielding. In this study, a series of porous frameworks were fabricated using multi-walled carbon nanotubes/acrylonitrile-styrene-acrylate (MWCNTs/ASA) composite filaments via 3D printing technology. The optimized porous architecture achieves an exceptional combination of low density (0.783 g/cm³) and high EMI shielding effectiveness (38 dB). Furthermore, the influence of pore size on the EMI shielding performance of the porous structures has been systematically investigated. This work demonstrates a promising strategy for manufacturing composite structures with both low density and high EMI shielding performance.