A Hybrid Sheet with EMI Shielding and Thermal Dissipation for Foldable Displays Using PDMS/Cu/SiC Composites and Graphite Foil

Abstract The growing demands of advanced display technology and high‐density electronic devices necessitate materials for next‐generation flexible electronics that combine mechanical deformation durability with superior electromagnetic interference shielding effectiveness (EMI SE) and thermal dissipation capabilities. However, the fabrication of such sheets that satisfy all these requirements presents several technological challenges. This study proposes a highly flexible, multilayered hybrid sheet designed to meet these requirements, employing graphite foil, known for its excellent electrical and high thermal conductivity, as a core layer, with conductive polydimethylsiloxane (PDMS)/copper (Cu)/silicon carbide (SiC) composites on both sides. The optimized hybrid sheet yields a maximum EMI SE of 56.14 dB, a vertical thermal conductivity of 1.10 W mk −1 , and a horizontal thermal conductivity of 30.45 W mk −1 , representing improvements of 381%, 80%, and 3659%, respectively, over a reference hybrid sheet. Furthermore, the hybrid sheet exhibits excellent flexibility, with no cracks after over 500 000 cycles in a 1.5R repeated folding test. These results validate the developed hybrid sheet's potential as a multifunctional solution for EMI shielding and thermal management in next‐generation flexible electronic devices.