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Self-organized layers of TiO2nanotubes were formed by electrochemical anodization of Ti in a HF/Na2HPO4electrolyte. The tubes were treated at 500?°C under a mixed flux of N2and acetylene (C2H2). The samples were characterized using SEM, XRD and photoelectrochemical measurements. The results show that the acetylene treated tube layers exhibit a significant photoresponse over the whole range of visible light up to the near-IR region (1.5 eV). This carbon doping treatment at comparable mild conditions does not lead to any structural damage to the morphology of the nanotubes. [ABSTRACT FROM AUTHOR]