Abstract
MXene (Ti3C2Tx) film is an extremely important macroscopic assembly of 2D MXene nanosheets, which has shown great commercial value in many fields. However, it is difficult to realize complex multi-scale structures design directly using MXene film as the base material. Herein, we discovered the self-welding phenomenon (time-sensitive) of MXene film based on water assistance. The MXene film can be connected freely during the time-sensitive period, but does not have self-weldability outside the time-effective period, ensuring the practicability of the connecting materials. Using the characteristics, the MXene film is successfully connected into a complex structure of humidity-responsive actuator and rolled into a vertically arranged dense electrode with capacitance independent of thickness. This work indicates that the MXene film has the same potential as metal and other engineering materials in the future, which is a milestone in the promotion of such conductive 2D material to real practical applications.
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