In particular, graphene related materials (GRMs), owing to their exceptional mechanical, electrical and thermal properties, have been widely investigated . Some researchers decorated CFs with GRMs to improve the interfacial properties, among which the electrophoretic deposition (EPD) and fibre sizing methods were used widely. Gangineni et al. studied several GRMs and found that the graphene carboxyl (G-COOH) one performs the best, which contributed to 9.6% and 22.9% improvement in flexural strength and interlaminar shear strength (ILSS) respectively. Similarly, Bhanuprakash et al. reported 25% and 47% improvement in flexural strength and ILSS with CFs coated by graphene oxide (GO) via EPD.