Anodic titanium oxide as immobilized photocatalyst in UV or visible light devices

Application-wise nanostructuring of anodic films on titanium: a review

“…Data presented in Figure 8 were extracted and processed from a previous work. [44] At low C 0 , degradation increases linearly with dye concentration and similar results are obtained with differently anodised specimens, indicating that tube length is not fully exploited yet (same degradation for short and long nanotubes); conversely, above 10 mmol/l longer tubes are still able to increase dye adsorption and maintain a consistent degradation, while shorter ones reach saturation conditions À i.e. full coverage of TiO 2 active sites.…”

“…Therefore, only the upper tube section is used, whose extension depends on the tube diameter and can be approximated to few micrometres, or less: this limit can be overcome in free-standing, flow-through membranes, where the entire tube length is exploited for photocatalytic reactions. [44] …”

“…[118] Currently, the most utilised method for nitrogen doping of anodic oxides is annealing in a suitable atmosphere (nitrogen, urea or ammonia). [44,118,119] 3.3.4. Memristive behaviour of non-stoichiometric oxides TiO 2 films generally present an insulating behaviour, but the presence of oxygen vacancies at the metalÀoxide interface introduces a peculiar electrical response as circuital elements known as memristance [120]: in some anodic oxides with nanoscale thickness resistivity is a function of current previously travelled through the oxide in the past (from where the memristor term arises), thus showing a bias-dependent bipolar switching response to current.…”

Effects of variations in precursor concentration on the growth of rutile TiO2 nanorods on Si substrate with fabricated fast-response metal–semiconductor–metal UV detector

“…Furthermore, TiO 2 is one of the most important semiconductor materials and is a well-known semiconductor material with a wide band gap (>3 eV for all crystalline phases) [2]. TiO 2 generally exists in three main crystalline forms (anatase, rutile, and brookite).…”

Nanostructure silver-doped zinc oxide films coating on glass prepared by sol–gel and photochemical deposition process: Application for removal of mercaptan

“…However, from a practical point of view it may encounter technological problems because of the need for the separation and recycling of the photocatalyst nanoparticles from the slurry after the wastewater treatment process. Recent investigations on photocatalysis are oriented toward the immobilization of photocatalyst as thin films on the support substrates [23][24][25]. Attempts have been made to immobilize the photocatalyst on rigid supports such as glass, glass fiber, glass bead, aluminum foil sheet, and plastic fiber-optic cable, and stainless steel.…”