Laser welding of carbon nanotube networks on carbon fibers from ultrasonic-directed assembly.

Graphical abstract Highlights • Long CNTs can be homogeneously coated on CF surface to form porous networks. • The epoxy serves as a local "welder" by the laser heating. • The networks were favourable for high-viscosity resin infiltration. • CNT/CF hybrids could afford a significantly higher interfacial bonding strength. • This method can be developed as a facile, scalable and cost-effective approach. Abstract A facile method to prepare carbon nanotube/carbon fiber hybrid fiber was explored by an intermittent ultrasonic-directed electrophoretic deposition, and a following laser transient heating was used for welding the deposited carbon nanotubes on carbon fibers at joints. The formed porous networks were favourable for resin infiltration, leading a significant increase in interfacial bonding strength of carbon fiber reinforced polycarbonate composites. [ABSTRACT FROM AUTHOR]