Scalable, Highly Conductive, and Micropatternable MXene Films for Enhanced Electromagnetic Interference Shielding

By J. Lipton, J. A. Röhr, V. Dang, Adam Goad, K. Maleski, F. Lavini, Meikang Han, Esther H. R. Tsai, Guoming Weng, J. Kong and 3 more. Matter, 2020

169 citations recorded by the source corpus.

Summary Two-dimensional transition metal carbides and nitrides (MXenes) have accumulated tremendous interest recently due to their high conductivity and excellent figures of merit in electromagnetic interference shielding and other applications. Large-area freestanding films of MXenes are important for versatility in application; however, alternative processing methods are needed for large-scale production. In this work, we demonstrate fabrication of Ti3C2Tx MXene freestanding films through drop-casting onto hydrophobic plastic substrates. Freestanding MXene films prepared using the drop-casting method can be fabricated in large areas (>125 cm2) and thicknesses (23.2 μm), and have smooth surfaces (14 nm RMS roughness) while maintaining high electrical conductivity (~7,000 S cm−1). Moreover, these MXene films can be micropatterned in three dimensions by processing on commercially available microstructured plastics, resulting in a 38% increase in normalized electromagnetic interference shielding efficiency compared with flat films. The results presented here suggest a scalable path toward creating MXene freestanding films for prototypes and industrialization.

Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/4f4c1405b4131764695ec7c9f8721475fd1dcfba