Ti Ion Beam Synthesis Of TiO₂ Nanoparticles In SiO₂ And Modification Induced By C Ion Irradiation

TiO₂ nanomaterials have a wide applications in solar cells,water purification,pollution gas dissociation and recovery of rare metals,due to its many excellent performance,such as chemical stability,light resistance,non-toxic,low cost and catalytic properties and so on.Nowadays,preparation of high quality TiO₂ nanostructures and,thus realization its visble light response has been received much more attention in the field of the nanotechnology.In this work,on the one hand,Ti ions were implanted into amorphous SiO₂ substrate,and were then subjected to furnace annealing in oxygen ambient.The formation of TiO₂ nanoparticles（NPs）as well as their structures,distribution,optical absorption properties and photocatalytic performance have been characterized in detail by using various techniques like cross-sectional transmission electron microscope（XTEM）,grazing incidence X-ray diffraction（GIXRD）,atomic force microscopy（AFM）and ultraviolet-visible（UV-Vis）.On the other hand,by using C ion irradiation at different fluences,the irradiation induced modifications in optical properties of the Ti ion beam synthesized TiO₂ NPs has also been studied.The main contents and corresponding results are given as follows:（1）105 keV Ti ions were implanted into SiO₂ substrate,and were then subjected to thermal annealing in oxygen atmosphere.The formation,structure,distribution,optical absorption property as well as photocatalytic performance of the formed nanoparticles（NPs）were characterized.The results clearly show that high-fluence Ti ion implantation into Si O₂ along with thermal treatments in oxygen atmosphere could cause formation of TiO₂ NPs,which mainly present rutile phase.Morphology of the synthesized TiO₂ NPs depends strongly on the applied fluence of Ti ions.With the fluence increasing,the irregular and isolated NPs could be transferred into densely distributed TiO₂ NPs,resulting in formation of particle-like thin films.In addition,the synthesized TiO₂ NPs at higher fluence show a certain photocatalytic degradation performance on Rhodamine B solution.（2）The synthesized TiO₂ particle-like thin films were irradiated with 35 keV C ions at fluences of 1×1016 and 3×1016 ions/cm2.The C ion irradiation induced modification in optical properties of the modificated in TiO₂ particle-like thin films under annealing in different atmospheres has been focused on.Our results demonstrate that there were no largely damage on the optical properties of TiO₂ nanoparticles film at this fluence in high temperature annealing,but there appeared a more obvious red shift in the Ti+3C sample,and when annealing in oxygen atmosphere,there has been appeared more effective influence by C ions.