1 Effect of carbon nanotube on properties of nickel/graphene oxide coating on copper substrate using electroplating method 1 A novel nickel-graphene oxide/carbon nanotube (Ni/GO/CNT) composite coating was deposited on a copper substrate via the electrodeposition method with different Concentration of CNT (0.5, 1 and 1.5 g/L). In this paper, the effect of CNT addition on the mechanical properties and morphology was investigated. For phase analysis, X-ray diffraction was performed, but the peak related to GO was not identified. Raman results confirm the presence of GO and CNT in Ni/GO/CNT coatings. The composite coatings with 1 g/L of CNT exhibited the maximum hardness, with a value of 840 HV. Furthermore, Ni/G0.5O/1CNT coating showed excellent adhesion strength, and minimum wear loss (0.0002 g). However, further addition CNT to 15 g/L led to a decrease in hardness. This is attributed to the agglomeration of CNT, which weakens the integrity of the structure. 1 4 Mahdi Aghaee Malayeri Faculty of Materials and Metallurgical Engineering, Semnan University, Semnan Iran mahdiaghaee@semnan.ac.ir Hassan Koohestani Faculty of Materials and Metallurgical Engineering, Semnan University, Semnan Iran h.koohestani@semnan.ac.ir Mohammad Tajally Faculty of Materials and Metallurgical Engineering, Semnan University, Semnan Iran m_tajally@semnan.ac.ir Graphene oxide Agglomeration Carbon nanotube Hardness Weight loss [1] J. Freudenberger, H. Warlimont, Copper and Copper Alloys, in: H. Warlimont, W. Martienssen (Eds.), Springer Handbook of Materials Data, Springer International Publishing, Cham, 2018, pp. 297-305.##[2] C. Li, W. Huan, Y. 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