Thermally Conductive Ti3C2Tx Fibers with Superior Electrical Conductivity

• Trace borate crosslinking significantly enhances interlayer interactions in Ti3C2Tx fibers, reducing interlayer spacing and improving orientation and compactness. • The resulting fibers achieve exceptional electrical conductivity of 7781 S cm−1 and tensile strength of 188.72 MPa, with Young's modulus of 52.42 GPa. • Crosslinking reduces interfacial thermal resistance, elevating thermal conductivity to 13 W m−1 K−1, marking the first systematic study on thermal conductivity of Ti3C2Tx fibers. • This scalable strategy offers a pathway for assembling other nanomaterials into multifunctional fibers for smart textiles and advanced electronics.