Evaluation of Photocatalytic Activity of the TiO2 Layer Formed on Ti by Thermal Oxidation

Abstract

Two-step thermal oxidation was proposed for Ti and Ti alloys as a surface-treatment process for preparing an anatase-containing TiO 2 layer. This process consisted of treatment in a CO-containing atmosphere (first step) and subsequent treatment in air (second step). In this chapter, first, the current status of TiO 2 coating onto Ti and Ti alloys for biomedical applications is reviewed; then our recent work on the phase and microstructure of TiO 2 layers prepared on commercially pure (CP) Ti, Ti-25mass%Mo alloy, and Ti-25mass%Nb alloy by two-step thermal oxidation is described. The anatase fraction in the TiO 2 layer was controlled through process parameters such as the second-step temperature. Finally, photocatalytic activity of TiO 2 layers formed on the Ti and Ti alloys is evaluated, including: results of water contact angle, decomposition of methylene blue, and antibacterial effects.

Direct Deposition of Crystalline Ta3N5 Thin Films on FTO for PEC Water Splitting

“…This electrode was then oxidized and nitridized to synthesize Ta 3 N 5 film. We hypothesize that during the oxidation process of the Ta layer, the Ti layer is also oxidized. , After annealing in ammonia in the presence of tantalum oxide, the Ti layer forms tantalum-doped TiO 2 (TTO) . We have previously shown that TTO is in fact a transparent conductive substrate .…”

Photocatalytic behaviour of anodised titanium using different cathodes

“…Besides, thermal oxidation is another way of obtaining a titanium dioxide layer, frequently for biomedical purposes and applications [17,22]. Different crystalline phases may be obtained, especially by thermal oxidation, among which anatase has a better efficiency [23] regarding photocatalytic behaviour, but a mixture of anatase and rutile in a proper proportion, for instance, the relation of approximately 80/20 (anatase/rutile) that can be found in [24] or in [22], obtains better photocatalytic efficiency than oxides containing only anatase. At the same time, the surface area is also known to play a key role in obtaining highly efficient oxides, as demonstrated by several literature works dealing with the production of nanotubular anodic oxides by anodic oxidation.…”

“…Other known important factors are the applied voltage and current among others. Besides, thermal oxidation is another way of obtaining a titanium dioxide layer, frequently for biomedical purposes and applications [17,22]. Different crystalline phases may be obtained, especially by thermal oxidation, among which anatase has a better efficiency [23] regarding photocatalytic behaviour, but a mixture of anatase and rutile in a proper proportion, for instance the relation of approximately 80/20 (anatase/rutile) that can be found in [24] or in [22], obtains better photocatalytic efficiency than oxides containing only anatase.…”

Synthesis and Effect of TIO2 on Electrical Conductivity of Poly (2, 5-Dimethoxyaniline)/ TIO2 Thin Film

“…The rutile phase is in stabilized state than the anatase phase for range of temperatures [4]. Though many techniques have been preferred for the TiO 2 thin films, like thermal oxidation method [5],sputtering [6], pyrolysis method [7], chemical vapor deposition (CVD) [8] sol-gel [9] is the most accepted method for its own advantageous like uncomplicated, inexpensive and time saving. In this work TiO 2 nano particles are synthesized at different mol concentration of precursor solution using sol-gel dip coating technique to study the electrical property of proton enriched p type Poly(2,5-dimethoxyaniline) /TiO 2 blend thin film.…”