仿生构筑超薄MXene/CNC电磁屏蔽复合薄膜

Bioinspired Ultrathin MXene/CNC Composite Film for Electromagnetic Interference Shielding

高强电磁屏蔽薄膜材料在柔性器件、汽车电子和航空航天等领域具有广泛应用前景,受珍珠母微纳米结构及其优异机械性能的启发,利用简单的溶液共混及真空抽滤方法,将纤维素纳米晶(CNC)和MXene混合,经层层组装制备了高性能MXene基复合薄膜。结果表明:薄膜的机械性能有了显著提高,拉伸强度从18 MPa提高到57 MPa,韧性从70 kJ/m^3提高到313 kJ/m^3,同时保留了复合薄膜的高电导率(104 S/m)和优异的电磁屏蔽性能,厚度8μm时可达40 dB以上。

Electromagnetic interference(EMI)shielding films with excellent mechanical properties are highly promising for applications in flexible devices,automotive electronics and aerospace.Inspired by the excellent mechanical properties of nacre derived from its micro/nanoscale structure,high-performance MXene/Cellulose nanocrystals(CNC)composite films were prepared by simple solution blending and followed vacuum-assisted filtration process.The presence of CNC significantly improves the mechanical properties with tensile strength increasing from 18 MPa to 57 MPa and toughness improving from 70 kJ/m^3 to 313 kJ/m^3.Meanwhile,the composite film still exhibits high electrical conductivity(up to 104 S/m)and excellent EMI shielding efficiency(over 40 dB)with a small thickness of 8μm.