Thermally conductive Ti3C2Tx fibers with superior electrical conductivity

A groundbreaking study published in Nano-Micro Letters presents a novel strategy for fabricating thermally conductive Ti₃C₂T_x fibers with superior electrical conductivity. This research, led by Professor Yali Zhang and Professor Junwei Gu from Northwestern Polytechnical University, demonstrates a significant enhancement in the mechanical, electrical, and thermal properties of Ti₃C₂T_x fibers through interfacial covalent crosslinking with borate ester bonds. The fibers exhibit exceptional performance, making them highly suitable for advanced applications in smart textiles and wearable electronics.

Why These Ti₃C₂T_x Fibers Matter

• Enhanced Mechanical and Electrical Properties: The fibers achieve a tensile strength of 188.72 MPa and electrical conductivity of 7781 S cm^-1, significantly outperforming previous Ti₃C₂T_x-based fibers.
• Superior Thermal Conductivity: The fibers exhibit a thermal conductivity of 13 W m^-1 K^-1, a major improvement enabled by the reduction of interfacial thermal resistance through covalent crosslinking.
• Scalable and Versatile Fabrication: The wet-spinning technique used in this study is scalable and can be applied to other nanomaterials, offering a versatile approach for creating multifunctional fibers.

Innovative Design and Mechanisms

• Covalent Crosslinking Strategy: The study introduces a covalent crosslinking strategy using trace amounts of borates to form strong bonds between Ti₃C₂T_x nanosheets. This method reduces interlayer spacing, enhances orientation, and increases compactness, leading to improved mechanical and electrical properties.
• Density Functional Theory (DFT) Calculations: DFT simulations confirm that borate ester bonds significantly enhance interlayer interactions, promoting the alignment and densification of Ti₃C₂T_x nanosheets.
• Equilibrium Molecular Dynamics (EMD) Simulations: EMD simulations reveal that the covalent bonds reduce interfacial thermal resistance, thereby enhancing the thermal conductivity of the fibers.

Applications and Future Outlook

• Smart Textiles and Wearable Electronics: The high electrical and thermal conductivity of these fibers make them ideal for applications in smart textiles, wearable electronics, and flexible devices.
• Thermal Management: The fibers' superior thermal conductivity and Joule heating performance highlight their potential for use in thermal management systems and wearable heaters.
• Future Research: Future work may focus on further optimizing the crosslinking process and exploring additional applications for these high-performance fibers.

Conclusion

The study led by Professor Yali Zhang and Professor Junwei Gu presents a significant advancement in the fabrication of Ti₃C₂T_x fibers. By introducing covalent crosslinking with borate ester bonds, the fibers exhibit exceptional mechanical strength, electrical conductivity, and thermal conductivity. This innovative approach not only enhances the performance of Ti₃C₂T_x fibers but also offers a scalable method for assembling other nanomaterials into multifunctional fibers. As research continues, these fibers hold great promise for practical applications in smart textiles and wearable technologies.

Stay tuned for more groundbreaking advancements from Professor Yali Zhang and Professor Junwei Gu as they continue to push the boundaries of materials science and engineering!