Highlights
• The present study displays formation of nanostructures after Co implantation on TiO
2
surfaces.
• Preferential sputtering leads to the creation of oxygen vacancies on the surface.
• A large enhancement in visible light absorbance (nearly 5 times compared to pristine) is observed.
• Creation of self-organized nanostructures and Ti
3+
oxygen vacancies promote photoabsorption.
• Formation of Co-nanoclusters and Co–Ti–O phase play concerted role in enhancing photo-absorption.
Abstract
Present study investigates the photoabsorption properties of single crystal rutile TiO
2
(110) surfaces after they have been implanted with low fluences of cobalt ions. The surfaces, after implantation, demonstrate fabrication of nanostructures and anisotropic nano-ripple patterns. Creation of oxygen vacancies (Ti
3+
states), development of cobalt nano-clusters as well as band gap modifications have also been observed. Results presented here demonstrate that fabrication of self organized nanostructures, upon implantation, along with the development of oxygen vacancies and ligand field transitions of cobalt ion promote the enhancement of photo-absorbance in both UV (∼2 times) and visible (∼5 times) regimes. These investigations on nanostructured TiO
2
surfaces can be important for photo-catalysis.
Page:
938-938
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