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Structural investigations on TiO2 and Fe-doped TiO2 nanoparticles synthesized by laser pyrolysis |
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| Authors: | R Alexandrescu I Morjan R Birjega I Soare I Voicu F Dumitrache E Vasile |
| Affiliation: | a National Institute for Lasers, Plasma and Radiation Physics, P.O. Box MG 36, R-077125, Bucharest, Romania b Ovidius University of Constanta, Constanta, Romania c METAV Research and Development SA, 31.C.A. Rosetti St, Bucharest, Romania d University of Basel, Department of Chemistry, Spitalstrasse 51, 4056 Basel, Switzerland |
| Abstract: | Undoped and Fe-doped TiO2 nanopowders with Fe/Ti (atomic ratio) precursor concentration ranging from 7% up to 25% have been prepared by the IR laser pyrolysis technique. A sensitized mixture of TiCl4 and Fe (CO)5 was used as titanium and iron precursor, respectively. Reference undoped titania samples with a major concentration of anatase phase (about 90%) were obtained by the same technique by using very high flows of the oxidizing agent (air). The effects of the iron-dopant concentration on the essential structural properties of the resultant powders such as the phase formation, the crystallinity, the average particle size and distributions were systematically investigated by X-ray diffraction, Raman spectroscopy and transmission electron microscopy. The decrease of the TiO2-anatase crystalline phase, the simultaneous increase of the amorphous phase and the decrease in size of particle mean diameter appear as main effects induced by the Fe-dopant concentration. |
| Keywords: | TiO2 nanoparticles Laser pyrolysis Fe-doped TiO2 Anatase Rutile |
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