J. Mater. Sci. Technol. ›› 2023, Vol. 168: 250-264.DOI: 10.1016/j.jmst.2023.04.076

• Research Article • Previous Articles     Next Articles

Enhanced antibacterial activity, corrosion resistance and endothelialization potential of Ti-5Cu alloy by oxygen and nitrogen plasma-based surface modification

Xiaotong Zhaoa, Jiali Hua, Jingjun Niec, Dafu Chenc,*, Gaowu Qina,b, Erlin Zhanga,b,*   

  1. aKey Lab. for Anisotropy and Texture of Materials, Education Ministry of China, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China;
    bResearch Center for Metallic Wires, Northeastern University, Shenyang 110819, China;
    cLaboratory of Bone Tissue Engineering, Beijing Laboratory of Biomedical Materials, National Center for Orthopaedics, Beijing Research Institute of Traumatology and Orthopaedics, Beijing Jishuitan Hospital, Beijing 100035, China
  • Received:2023-03-02 Revised:2023-04-04 Accepted:2023-04-18 Published:2024-01-01 Online:2023-12-25
  • Contact: *E-mail addresses: chendafujst@126.com (D. Chen), zhangel@atm.neu.edu.cn (E. Zhang)

Abstract: Antibacterial Ti-5Cu alloy is a promising substitute material for Ti-made cardiovascular implants, so its surface engineering is crucial to expediting clinical implementation. Given the antibacterial and cardiovascular biological benefits of Cu2+ and titanium-nitride-oxide (TiNxOy) coatings, a Cu2O/CuO-TiNxOy coating with upregulated Cu2+ release was successfully deposited on Ti-5Cu alloy for the first time using oxygen and nitrogen plasma-based surface modification. The superhydrophilic and nanostructured Cu2O/CuO-TiNxOy coating had a dense structure and was well bonded to the substrate, resulting in enhanced corrosion resistance, while CuO/Cu2O in the coating released Cu2+ faster than Ti2Cu phase in the matrix. More gratifying, the coating demonstrated perfect antibacterial properties (R > 99.9% against S. aureus), owing primarily to direct contact sterilization of Cu2O/CuO. The most encouraging phenomenon was that the coating dramatically accelerated HUVEC adhesion (1.4 times), proliferation (RGR: 106%-116%), and particularly migration (RMR: 158%-247%) compared with the control Ti. The coating extract also significantly stimulated in vitro angiogenesis capacity. The rapid endothelialization for Cu2O/CuO-TiNxOy coating was attributed to the surface nanostructure and Cu2+/NO2- release, which upregulated the angiogenesis-related gene expression of HIF-1α, VEGF, and eNOS to increase VEGF secretion and NO production. All of the findings indicated that the Cu2O/CuO-TiNxOy coating could enhance the corrosion resistance, antibacterial properties, and endothelialization potential of Ti-Cu alloy, displaying great clinical potential in cardiovascular applications.

Key words: Titanium-copper alloy, Titanium-nitride-oxide (TiNxOy), Cu2+ release, Antibacterial property, Cell compatibility