Experimental and Theoretical Study on Transition Metal Ion Doped TiO2
In this paper, TiO2 crystallines doped with transition metal ions have been prepared by sol-gel method. The UV-visible spectra indicated that the doping with transition metal ions (especially Cu2+, Mn2+ and Cr3+ ions) could effectively improve the absorption of TiO2 crystals in the visible-light range. The XRD results showed that the doping does not affect the anatase phase of TiO2. The band structure and the UV-vis absorption spectrum of Mn2+ ions doped-TiO2 were also calculated by DFT (density function theory) method, which indicated that the doping with transition metal ion could make the band gap of TiO2 smaller and a red shift in optical absorption.
Zhong Cao, Lixian Sun, Xueqiang Cao, Yinghe He
X. C. Zhong et al., "Experimental and Theoretical Study on Transition Metal Ion Doped TiO2", Advanced Materials Research, Vols. 233-235, pp. 2219-2222, 2011