(163s) Scalable, Highly Conductive and Micro-Patternable Mxene Films for Enhanced Electromagnetic Interference Shielding | AIChE

(163s) Scalable, Highly Conductive and Micro-Patternable Mxene Films for Enhanced Electromagnetic Interference Shielding

Authors 

Lipton, J. - Presenter, New York University
Rohr, J., New York University
Maleski, K., Drexel University
Dang, V., New York University
Goad, A., Drexel University
Gogotsi, Y., Drexel University
Taylor, A. D., Yale University
2D transition metal carbides and nitrides (MXenes) have accumulated tremendous interest recently as a result of their high conductivity, aspect ratio, and excellent figures of merit in numerous application areas.[1–3] Freestanding films of MXenes are important for versatility in their incorporation into roll-to-roll production to allow for large-scale fabrication. Vacuum assisted filtration is currently the state-of-the-art for fabrication of freestanding MXene films, however methods that increase the active film area are beneficial for large-scale production and wide use of this material. Aqueous-based solution casting onto hydrophilic substrates is a useful way to make MXene coatings but they cannot be delaminated from the substrate to yield a freestanding film. In this work, we show that it is possible to fabricate Ti3C2Tx MXene freestanding films through simple drop-casting onto hydrophobic substrates. MXene films prepared using this technique have greater alignment of MXene flakes due to repulsive interactions between the substrate and the Ti3C2Tx MXenes and allows for facile delamination of the film from the substrate. We show that freestanding drop-cast MXene films can be fabricated in large areas (>125 cm2) and thicknesses (23.2 µm) while maintaining high electronic conductivity (~7,000 S cm-1). Drop-cast MXene films can also be micropatterned in three-dimensions (3D) simply by using commercially available microstructured plastics as substrates (Figure 1). These 3D-patterned MXene films exhibit a 38% increase in EMI shielding efficiency normalized to thickness and density (EMI SSE/t) as compared to their unpatterned counterparts, yielding EMI SSE/t as high as 48,800 dB cm2 g-1. The results presented here represent a step forward in the advancement of the prospect of MXene industrialization, opening the door for progression in design of novel prototypes of MXene devices.

[1] G.-M. Weng, J. Li, M. Alhabeb, C. Karpovich, H. Wang, J. Lipton, K. Maleski, J. Kong, E. Shaulsky, M. Elimelech, Y. Gogotsi, A.D. Taylor, Layer-by-Layer Assembly of Cross-Functional Semi-transparent MXene-Carbon Nanotubes Composite Films for Next-Generation Electromagnetic Interference Shielding, Adv. Funct. Mater. 28 (2018) 1803360. https://doi.org/10.1002/adfm.201803360.

[2] J. Lipton, G. Weng, M. Alhabeb, K. Maleski, F. Antonio, J. Kong, Y. Gogotsi, A.D. Taylor, Mechanically strong and electrically conductive multilayer MXene nanocomposites, Nanoscale. 11 (2019) 20295–20300. https://doi.org/10.1039/C9NR06015D.

[3] M. Mariano, O. Mashtalir, F. Antonio, W.-H. Ryu, B. Deng, F. Xia, Y. Gogotsi, A. Taylor, Solution-processed Titanium Carbide MXene films examined as highly transparent conductors, Nanoscale. 8 (2016) 16371–16378. https://doi.org/10.1039/C6NR03682A.