Advanced titanium dioxide-polytetrafluorethylene (TiO2-PTFE) nanocomposite coatings on stainless steel surfaces with antibacterial and anti-corrosion properties

Shuai Zhang, Xinjin Liang, Geoffrey Michael Gadd, Qi Zhao (Lead / Corresponding author)

Research output: Contribution to journalArticle

5 Citations (Scopus)
121 Downloads (Pure)


Bacterial infection and corrosion are two of the most common causes of the failure for the use of biomedical metallic implants. In this paper, we developed a facile two-step approach for synthesizing a TiO2-PTFE nanocomposite coating on stainless steel substrate with both antibacterial and anticorrosion properties by using a sol-gel dip coating technique. A sub-layer of bioinspired polydopamine (PDA) was first coated on the stainless steel substrate to improve the adhesion and reactivity, then TiO2-PTFE was uniformly co-deposited onto the PDA sub-layer. Both PTFE and TiO2 contents had a significant influence on the surface energy of the TiO2-PTFE coating. The coating with the total surface energy of 26 mJ/m2 exhibited minimal bacterial adhesion against both Gram-negative Escherichia coli WT F1693 and Gram-positive Staphylococcus aureus F1557, which was explained using the extended DLVO theory. Benefiting from the synergistic effect between TiO2 and PTFE, the TiO2-PTFE coating showed improved corrosion resistance in artificial body fluids compared with the sole TiO2 coating or PTFE coating. The TiO2-PTFE coating also demonstrated extraordinary biocompatibility with fibroblast cells in culture, making it a prospective strategy to overcome current challenges in the use of metallic implants.
Original languageEnglish
Pages (from-to)231-241
Number of pages11
JournalApplied Surface Science
Early online date8 Jun 2019
Publication statusPublished - 1 Oct 2019



  • Titanium dioxide
  • Polytetrafluoroethylene
  • Surface energy
  • Antibacterial activity
  • Corrosion

Cite this