Surface modification of CNTs to improve comprehensive properties of CNTs/Cu composites

In order to improve the dispersibility and uneven distribution of carbon nanotubes (CNTs) in the copper matrix, the surface of CNTs were modified to enhance their dispersibility in the copper matrix. In this paper, different concentrations (7.5%, 15%, 30%) of HNO3 were used to functionalize the surface of CNTs to improve the chemical inertness of CNTs, and surface modification was performed on the purified and de-hybridized CNTs to make the CNTs better dispersed in the metal matrix. At the same time, the mechanical properties and electrical conductivity of the carbon nanotube-reinforced copper-based composites were analyzed. According to research result, 15% HNO3 combined with subsequent surface treatment have the best effect on surface modification of CNTs, significantly improving the dispersibility of CNTs and better exerting the excellent coordination effect of CNTs in copper-based composite. In addition, it is confirmed that the obtained Cu-CNTs/Cu composites have excellent comprehensive properties, which provide a new idea to improve the characteristics of copper-based composites doped with CNTs.