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 Ti₃C₂T_x 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.

二维过渡金属碳化物和氮化物（MXenes）由于其高导电性和在电磁干扰屏蔽和其他应用中的优异品质，最近引起了人们的极大兴趣。MXene的大面积独立式薄膜对于应用中的多功能性很重要。但是，大规模生产需要替代的加工方法。在这项工作中，我们演示了通过滴铸到疏水性塑料基材上来制造Ti ₃ C ₂ T _x MXene独立膜。使用滴铸法制备的独立式MXene膜可在大面积（> 125 cm ²）和厚度（23.2μm），并具有光滑的表面（14 nm RMS粗糙度），同时保持高电导率（〜7,000 S cm ^-1）。此外，这些MXene膜可以通过在市售的微结构塑料上进行加工而在三个维度上进行微图案化，与平膜相比，标准化电磁干扰屏蔽效率提高了38％。此处呈现的结果为创建用于原型和工业化的MXene独立膜提供了一条可扩展的途径。