Research Center for Engineering of
                Systems with Complex Fluids
Title: Photochemistry aspects of the laser pyrolysis addressing the preparation of oxide semiconductor photocatalysts
Published In: International Journal of Photoenergy, ID 604181 (11 pp.)
Description: The laser pyrolysis is a powerful and a versatile tool for the gas-phase synthesis of nanoparticles. In this paper, some fundamental and applicative characteristics of this technique are outlined and recent results obtained in the preparation of gamma iron oxide (gamma-Fe(2)O(3)) and titania (TiO(2)) semiconductor nanostructures are illustrated. Nanosized iron oxide particles (4 to 9 nm diameter values) have been directly synthesized by the laser-induced pyrolysis of a mixture containing iron pentacarbonyl/air (as oxidizer)/ethylene (as sensitizer). Temperature-dependent Mossbauer spectroscopy shows that mainly maghemite is present in the sample obtained at higher laser power. The use of selected Fe(2)O(3) samples for the preparation of water-dispersed magnetic nanofluids is also discussed. TiO2 nanoparticles comprising a mixture of anatase and rutile phases were synthesized via the laser pyrolysis of TiCl(4)- (vapors) based gas-phase mixtures. High precursor concentration of the oxidizer was found to favor the prevalent anatase phase (about 90%) in the titania nanopowders.
ISSN:ISSN: 1110-662X
DOI:DOI: 10.1155/2008/604181
Publication year: 2008
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Authors: ALEXANDRESCU Rodica , MORJAN Ion , DUMITRACHE Florian , SCARISOREANU Monica , SOARE Iuliana , FLEACA Claudiu , BIRJEGA Ruxandra , POPOVICI Ernest , GAVRILA Lavinia , PRODAN Gabi , CIUPINA Victor , FILOTI George , KUNCSER Victor , VEKAS Ladislau ,
Type: International Journal Article
Laboratory: Magnetometry Laboratory
Institution: ARFT