MXenes, a class of two-dimensional (2D) materials, are synthesized by etching MAX phase precursors to produce multilayer MXenes, where individual 2D sheets are held together by van der Waals forces. Typically, single 2D flakes of MXene are produced by chemical intercalation to delaminate multilayer MXenes, which is a time-intensive process that produces excess waste. In addition, intercalants affect the properties of MXenes. Many of them are toxic, limiting medical applications. Moreover, the process does not work for certain MXene chemistries, such as halogen-terminated MXenes produced by molten salt etching. This work demonstrates an alternative approach, shearing multilayer MXenes with a three-roll mill to produce single- and few-layer Ti3C2Tx flakes without chemical intercalants. The high shear produced Ti3C2Tx flakes showed a capacitance of 337 F g(-1), comparable to flakes made with LiCl intercalation, in 3 M H2SO4. We generalize this approach by shear delamination of other MXenes.
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机译：MXenes 是一类二维 （2D） 材料，通过蚀刻 MAX 相前驱体来合成，以产生多层 MXenes，其中单个 2D 片通过范德华力结合在一起。通常，MXene的单个2D薄片是通过化学插层来分层多层MXenes产生的，这是一个耗时的过程，会产生过多的废物。此外，插层剂会影响MXenes的性能。其中许多是有毒的，限制了医疗应用。此外，该工艺不适用于某些MXene化学成分，例如熔盐蚀刻产生的卤素封端MXenes。这项工作展示了另一种方法，即用三辊轧机剪切多层MXenes，以生产单层和少层Ti3C2Tx薄片，而无需化学插层剂。在3 M H2SO4中，高剪切产生的Ti3C2Tx薄片的电容为337 F g（-1），与LiCl插层制成的薄片相当。我们通过对其他MXenes进行剪切分层来推广这种方法。
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