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.