ZnO NPs decorated on TiO2–SiO2 PEO coatings for photocatalytic applications

作者：M. S. Vasilyeva, Olga D. Arefieva, Yu.B. Budnikova, V. V. Korochentsev, M.A. Bukhari, В. В. Ткачев, D.H. Shlyk, Г.А. Зверев · 发表于：Results in Surfaces and Interfaces · 年份：2025 · DOI：10.1016/j.rsurfi.2025.100447 · 被引用次数：4 · 研究领域：Advanced Photocatalysis Techniques、TiO2 Photocatalysis and Solar Cells、ZnO doping and properties

TiO 2 –SiO 2 –ZnO photoactive oxide layers were obtained using simple and environmentally friendly procedures, including plasma electrolytic oxidation (PEO) of titanium in an aqueous solution of Na 2 SiO 3 , impregnation of the PEO coatings in an aqueous solution of Zn(CH 3 COO) 2 , followed by annealing at 500 °C for 1 h. XRD, EDX, XPS, SEM, Raman spectroscopy and UV-DRS were used to characterize the formed samples. The effect of ultrasonic cleaning and alkaline treatment of TiO 2 –SiO 2 PEO layers on the composition, morphology, optical and photocatalytic properties of coatings modified with ZnO NPs was systematically investigated. XRD analysis showed the presence of hexagonal wurtzite ZnO, anatase and rutile TiO 2 in all modified PEO coatings. Ultrasonic cleaning of PEO coatings reduces the concentration of organic contaminants on their surface, destroys fragile silicon-containing “coral caps”, leading to an increase in the concentration of zinc on their surface after impregnation. Alkaline treatment of PEO coatings increases the surface porosity due to the destruction of surface areas due to the opening of siloxane bonds (Si–O–Si) that bind the framework. The degree of filling of the PEO coating surface with ZnO nanoparticles increases after ultrasonic cleaning and even more after alkaline treatment. The band gaps of ZnO-free and ZnO-modified PEO coatings are 3.11 eV and 3.29–3.32 eV, respectively. ZnO-modified samples exhibit photocatalytic activity in the Indigo Carmine...