Changing the morphology of two-dimensional materials often offers an efficient and effective means to exploit their electronic and mechanical properties. Two-dimensional materials such as graphene can be scrolled into one-dimensional fibers via simple sonication. Unfortunately, scrolling MXene nanosheets into fibers is quite challenging, especially Ti₃C₂T_x composed of three layers of titanium atoms and two layers of carbon atoms. Herein, we report a new method to fabricate MXene fibers via ascorbic acid (AA) induced scrolling of Ti₃C₂T_x nanosheets. An unusual AA-Ti₃C₂T_x interaction is discovered in that intercalated AA molecules bind to and interact with the Ti₃C₂T_x surface in the form of a hydrogen bonding-bonded assembly instead of as individual molecules, and a sheet-scrolling mechanism is proposed based on this interaction. The as-obtained MXene fibers exhibit a compact cross-section, and the diameter can be tailored from hundreds of nanometers to several micrometers through tuning the MXene/AA ratio. Moreover, the storage modulus of the MXene-fiber sponge attains its maximum value of ∼1 MPa when a unique morphology comprising both fibers and not-yet-scrolled sheets is presented. This work offers a new strategy of fiber-shaping MXenes for applications in structural composites and flexible electronics.

中文翻译：

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抗坏血酸诱导的碳化钛 Ti3C2Tx MXene 的纤维卷曲

改变二维材料的形态通常提供了一种有效的方法来利用它们的电子和机械性能。通过简单的超声处理，可以将石墨烯等二维材料卷成一维纤维。不幸的是，将 MXene 纳米片滚动成纤维非常具有挑战性，尤其是由三层钛原子和两层碳原子组成的Ti ₃ C ₂ T _{x 。}在此，我们报告了一种通过抗坏血酸 (AA) 诱导的 Ti ₃ C ₂ T _x纳米片滚动来制造 MXene 纤维的新方法。不寻常的 AA-Ti ₃ C ₂ T_x相互作用的发现在于插入的AA分子以氢键结合的组装形式而不是单个分子的形式与Ti ₃ C ₂ T _x表面结合并相互作用，并且基于这种相互作用提出了片滚动机制. 所获得的 MXene 纤维具有紧凑的横截面，通过调整 MXene/AA 比率，可以将直径从数百纳米调整到几微米。此外，当呈现包含纤维和尚未卷曲的片材的独特形态时，MXene 纤维海绵的储能模量达到其最大值约 1 MPa。这项工作为结构复合材料和柔性电子产品的应用提供了一种新的纤维成型 MXene 策略。