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The interfacial shear strength between the fiber and the thermoplastic matrix is one of the most important factors affected mechanical performances of carbon fiber-reinforced thermoplastic composites (CFRTPs). There have been many investigations of the interfacial shear strength that studied surface treatments. Chemical treatment methods have been widely used to activate the inert fiber surface and thus increase the surface free energy. However, these treatment methods can degrade the mechanical properties of the carbon fibers due to surface etching. Coating metal oxides onto the carbon fibers using hydrothermal methods can improve the interfacial shear strength without degrading the mechanical properties of the fiber. However, due to their long processing time, it is difficult to apply these hydrothermal methods to the continuous manufacturing process for carbon fibers. In this study, a novel method for …