CVD of TiO2 and TiO2/Ag antimicrobial layers: Deposition from the hexanuclear μ-oxo Ti(IV) complex as a precursor, and the characterization

• Published in: Surface & coatings technology Vol. 222; pp. 38 - 43
• Main Authors: Piszczek, P., Muchewicz, Ż., Radtke, A., Gryglas, M., Dahm, H., Różycki, H.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.05.2013; Elsevier
• Subjects: Antimicrobial properties; Cross-disciplinary physics: materials science; rheology; CVD; Exact sciences and technology; Hexanuclear μ-oxo-titanium(IV) complex; Materials science; Physics; Polycrystalline structure; Surface treatments; TiO2 and TiO2/Ag layers; CVD; TiO2 and TiO2/Ag layers; Polycrystalline structure; Hexanuclear μ-oxo-titanium(IV) complex; Antimicrobial properties; and Ti0; Ag layers; Surface treatments; TiO; Titanium oxide
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2013.01.057

Hexanuclear μ-oxo titanium(IV) complex, of the general formula [Ti6O6(H2O)2(OiBu)6(O2CtBu)6], has been used as a new type of TiO2 chemical vapor deposition precursor. Thin titanium dioxide layers of a different polymorphic structure were grown on the surface of titanium foil or titanium surgical implants, as substrates, in a wide range of substrate temperatures 693–853K, under Ar atmosphere. The best antimicrobial activity revealed TiO2 covers deposited between 713 and 733K. Loose packing layers produced at 733K were doped by silver grains by CVD method using silver(I) 3,3-dimethyl tert-butyrate complex with triethylphosphane as a precursor. The increase of the antimicrobial activity of TiO2–Ag system with the increase of Ag grains content was noticed. Crystallinity, composition, and morphology of TiO2 and TiO2/Ag layers were analyzed by X-ray diffraction method, high resolution transmission electron microscopy, and scanning electron microscopy. ► Thin TiO2 films were grown by CVD method using a new type of a precursor. ► TiO2/Ag coatings with ~1%–~4% metallic silver dopant, were produced. ► Titanium implants have been used as substrates. ► Crystallinity, composition, and morphology of TiO2 and TiO2/Ag films are analyzed. ► Microbiocidal properties of TiO2 and TiO2/Ag thin layers are discussed.