Abstract
TiO 2 nanotubes were produced by self-organized electrochemical oxidation of Ti. The tubes were N-ion implanted at two nominal fluencies, 1 × 10 15 and 1 × 10 16 ions/cm 2. Implantation was carried out into amorphous and crystalline (anatase) tubes. Photoelectrochemical, SEM and XRD measurements show successful doping at a dose of 1 × 10 16 ions/cm 2, however the ion implantation process causes strong structural alterations. Amorphous tubes show a disintegration of the morphological integrity, while anatase tubes are ‘amorphized’. This amorphization leads to a decrease of photoresponse in the UV range, but the N-doping results in a strong sub-band gap response.
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