Ti3C2Tx MXene is a rising class of two-dimensional nanomaterials. It has outstanding electrical conductivity and electrochemical performance, and has great potential in the preparation of multifunctional macromaterials and nanomaterials. Recently, many researchers have tried to prepare MXene-based fibers by wet spinning and electrospinning, using a mixed solution of MXene and polymer as a spinning solution, or co-assembly with MXene/rGO. However, compared to the electrical conductivity of the composite of MXene and rGO (72-290 S cm-1), the electrical conductivity of CNT fibers (26 S cm-1) and PEDOT:PSS (1489 S cm-1), It does not make full use of the high electrical conductivity (9880 S cm-1) inherent in pure Ti3C2Tx MXene. For wet-spun pure MXene fibers, the key challenge is the weaker self-support due to poor interlayer contact between their smaller MXene sheets. In addition, the lower concentration of the dispersion further limits the direct formation of MXene in the form of ID fibers.

     Recently, Professor Tae Hee Han of Hanyang University in South Korea published a research paper titled: Large-scale wet-spinning of highly electroconductive MXene fibers in the internationally renowned academic journal Nature Communication. , MXene fiber that is continuously controllable, without additives/binders. The prepared MXene sheet (average size 5.11 μm2) has a higher concentration in water, does not form aggregates and phase separation does not occur. The introduction of ammonium ions can make MXene sheet assembled into flexible long-scale fibers, and has very high conductivity (7713 S cm-1)
 

 
Figure 1. Schematic diagram of the preparation process of MXene fiber.

Figure 2. Synthesis and characterization of Ti3C2TxMXene.
 

Figure 3. The dispersibility and corresponding characterization of MXene nanosheets.
 

Figure 4. Wet spinning process of pure Ti3C2TxMXene fiber.
 

Figure 5. Comparison of Young‘s modulus and conductivity.

This paper reports a direct and reliable synthesis strategy. A binder/additive-free, high-purity 1D MXene fiber is prepared by wet spinning, which has high conductivity. The corresponding dispersion has a large Ti3C2TxMXene size (average size and aspect ratio of ~5.11 μm2 and 1600, respectively), and a stable colloidal solution with a high concentration (25 mg mL-1). The prepared MXene fiber has excellent performance as a wire to control LED lights and transmit electrical signals to headphones. In addition, MXene fibers exhibit high flexibility and outstanding mechanical properties. The reported wet spinning strategy has implications for Chi Xun‘s mass production of MXene fibers, demonstrating its greater application potential in the field of high-performance, flexible wearable electronics.

Literature link:
https://doi.org/10.1038/s41467-020-16671-1

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