In this work, the grow of carbon nanotube (CNT) on carbon fiber was introduced on PAN-based carbonfibers for the enhancement of mechanical interfacial strength of carbon fibers-reinforced composites. Thesurface properties of carbon fibers were determined by scanning electron microscopy (SEM) and mechanicalinterfacial properties of the composites were studied by interlaminar shear strength (ILSS). From the results,it was found that the mechanical interfacial properties of CNT-carbon fibers-reinforced composites (CNTCFRPs)enhanced with decreasing the CNT content. The excessive CNT content can lead the failure dueto the interfacial separation between fibers and matrices in this system. In conclusion, the optimum CNTcontent on carbon fiber surfaces can be a key factor to determine the mechanical interfacial properties ofthe CNT-CFRPs.

In this work, the grow of carbon nanotube (CNT) on carbon fiber was introduced on PAN-based carbon fibers for the enhancement of mechanical interfacial strength of carbon fibers-reinforced composites. The surface properties of carbon fibers were determined by scanning electron microscopy (SEM) and mechanical interfacial properties of the composites were studied by interlaminar shear strength (ILSS). From the results,it was found that the mechanical interfacial properties of CNT-carbon fibers-reinforced composites (CNTCFRPs)enhanced with decreasing the CNT content. The excessive CNT content can lead the failure due to the interfacial separation between fibers and matrices in this system. In conclusion, the optimum CNT content on carbon fiber surfaces can be a key factor to determine the mechanical interfacial properties of the CNT-CFRPs