  Present study investigates the photoabsorption properties of single crystal
rutile TiO2 (110) surfaces after they have been implanted with low fluence of
Cobalt ions. The surfaces, after implantation, demonstrate fabrication of
nanostructures and anisotropic nano-ripple patterns. Creation of oxygen
vacancies (Ti3+ states) as well as band gap modification for these samples is
also observed. Results presented here demonstrate that fabrication of self
organized nanostructures and development of oxygen vacancies, upon cobalt
implantation, promote the enhancement of photoabsorbance in both UV (2 times)
and visible (5 times) regimes. These investigations on nanostructured TiO2
surfaces can be important for photo- catalysis.
