Abstract
A series of anatase phase Fe-dopedTiO2 nanoparticles are prepared by a modified sol–gel method. Spontaneous Raman spectroscopyis utilized to characterize the crystal structures of these nanoparticles and investigate theirstructural transformation under the exposure of a 532 nm green laser. The anatase phase ofTiO2 can be effectively converted into the rutile phase with the assistance of Fedoping. It is found that the critical laser intensity for phase transformationdecreases with increasing the Fe content. We ascribe this tendency to theenhanced optical absorption and the photo-induced thermal heating effect,which can be associated with the defect structure within the bandgap of Fe-TiO2 nanoparticles. Our study demonstrates an all-optical approachto pump and probe the phase transformation of metal-dopedTiO2 nanoparticles.
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