A Novel Way to Fabricate Fe Doped TiO2 Nanotubes by Anodization of TiFe Alloys

We reported the fabrication of self–organized, vertically oriented Ti–Fe–O nanotube array films grown by anodization of Ti–xFe alloys in an ethylene glycol and NH4F mixed electrolyte and their Uv–Vis spectrum (200–1000 nm) photoresponse properties. The key factor affecting the morphology is the Fe content. The higher the Fe content is, the flatter the nanotubes surface is, and the more disorder the bottom surface appears. XRD and photoresponse measurements demonstrate the realizable iron doping of the nanotube layers, which leads to a significant visible photoresponse. The Ti–12Fe sample prepared has a high photoresponse in visible range of the spectrum.