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Phase Composition of TiO2 Nanopowders Prepared by IR Laser Synthesis from Gaseous Precursors

I. Morjan, M. Scarisoreanu, R. Alexandrescu, R. Birjega, I. Soare, I. Voicu, C. Fleaca, E. Popovici, F. Dumitrache, V. Ciupina and E. Figgemeier
National Institute for Lasers, Plasma and Radiation Physics, RO

Keywords:
nanoparticles, laser pyrolysis, titania, anatase, rutile

Abstract:
Titania nanopowders with controlled chemical composition of phases and with a suitable morphology present the highest applicative interest. In this paper, a systematic study of phase composition and more specifically of the anatase-to-rutile transformation of nanocrystalline titania was performed. TiO2 nanoparticles were prepared by the CO2 laser pyrolysis of TiCl4/air/C2H4 gas mixtures. Ethylene serves as a radiation absorber. The synthesized powder was characterized by, XRD, TEM and IR spectroscopy. According to our XRD investigations, the dominating anatase/rutile phase strongly depends on the induced reaction temperature which in turn is a function of main reaction parameters such as laser power density, the reactor pressure, the relative flow of the oxidizing agent, etc. Depending on reaction parameters TEM analysis reveals particle mean diameters values of 15-30 nm The role of titania nanoparticles as photocatalyst is discussed and preliminary results are presented

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