High‐Performance Multifunctional Nanopapers with Superior Mechanical Strength, Electromagnetic Interference Shielding, and Thermal Management for Next‐Generation Electronics

Abstract Developing high‐performance multifunctional materials is critical for advancing integrated electronics and telecommunication systems. This study presents super‐strong, ultra‐flexible, conductive nanopapers featuring layered architectures, achieved by incorporating cellulose nanofibril‐modified MXene (CM9) and cellulose nanocrystals (CNCs) into an aramid nanofiber (ANF) network and silver nanowire (AgNW) framework through a multi‐stage vacuum filtration. The resulting nanopapers achieve remarkable tensile strength (701.82 MPa), outstanding toughness (101.86 MJ m⁻³), and a specific tensile strength of 486.67 MPa·g⁻¹·cm³, notably outperforming that of titanium alloys (257 MPa·g⁻¹·cm³). In addition to their mechanical properties, the nanopapers exhibit high electrical conductivity (1139.48 S cm⁻¹), resulting in superior electromagnetic interference (EMI) shielding effectiveness (EMI SE) of 62.28 dB with an ultra‐thin profile of 22.38 µm. The nanopapers also demonstrate excellent durability, maintaining an EMI SE of 60.16 dB after 20% stretching and 57.15 dB after 20 000 folding cycles, along with a tensile strength of 685.59 MPa. Additionally, they exhibit efficient photothermal conversion and electrothermal deicing capabilities, reaching a maximum temperature of 242.78 °C under applied voltage. With their unique combination of mechanical robustness, conductivity, and thermal performance, these nanopapers show great potential for next‐generation electronics, flexible displays, and high‐performance thermal management systems.