Abstract
TiO 2 nanotube (NT) arrays modified by Fe 2O 3 with high sensibility in the visible spectrum were first prepared by annealing anodic titania NTs pre-loaded with Fe(OH) 3 which was uniformly clung to the titania NTs using sequential chemical bath deposition (S-CBD). The photoelectrochemical performances of the as-prepared composite nanotubes were determined by measuring the photo-generated currents and voltages under illumination of UV–vis light. The titania NTs modified by Fe 2O 3 showed higher photopotential and photocurrent values than those of unmodified titania NTs. The enhanced photoelectrochemical behaviors can be attributed to the modified Fe 2O 3 which increases the probability of charge–carrier separation and extends the range of the TiO 2 photoresponse from ultraviolet (UV) to visible region due to the low band gap of 2.2 eV of Fe 2O 3.
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