Photochemistry Aspects of the Laser Pyrolysis Addressing the Preparation of Oxide Semiconductor Photocatalysts
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 (γ-Fe2O3) and titania (TiO2) semicond...
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2008-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2008/604181 |
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| author | R. Alexandrescu I. Morjan F. Dumitrache M. Scarisoreanu I. Soare C. Fleaca R. Birjega E. Popovici L. Gavrila G. Prodan V. Ciupina G. Filoti V. Kuncser L. Vekas |
| author_facet | R. Alexandrescu I. Morjan F. Dumitrache M. Scarisoreanu I. Soare C. Fleaca R. Birjega E. Popovici L. Gavrila G. Prodan V. Ciupina G. Filoti V. Kuncser L. Vekas |
| author_sort | R. Alexandrescu |
| collection | DOAJ |
| 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 (γ-Fe2O3) and titania (TiO2) 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 Fe2O3 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 TiCl4- (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. |
| format | Article |
| id | doaj-art-b4a2b6a9fa1941c5b5ab6fc5b87a0fae |
| institution | Kabale University |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2008-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-b4a2b6a9fa1941c5b5ab6fc5b87a0fae2025-02-03T06:12:38ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2008-01-01200810.1155/2008/604181604181Photochemistry Aspects of the Laser Pyrolysis Addressing the Preparation of Oxide Semiconductor PhotocatalystsR. Alexandrescu0I. Morjan1F. Dumitrache2M. Scarisoreanu3I. Soare4C. Fleaca5R. Birjega6E. Popovici7L. Gavrila8G. Prodan9V. Ciupina10G. Filoti11V. Kuncser12L. Vekas13National Institute for Lasers, Plasma and Radiation Physics, P.O. Box MG 36, 077125 Bucharest, RomaniaNational Institute for Lasers, Plasma and Radiation Physics, P.O. Box MG 36, 077125 Bucharest, RomaniaNational Institute for Lasers, Plasma and Radiation Physics, P.O. Box MG 36, 077125 Bucharest, RomaniaNational Institute for Lasers, Plasma and Radiation Physics, P.O. Box MG 36, 077125 Bucharest, RomaniaNational Institute for Lasers, Plasma and Radiation Physics, P.O. Box MG 36, 077125 Bucharest, RomaniaNational Institute for Lasers, Plasma and Radiation Physics, P.O. Box MG 36, 077125 Bucharest, RomaniaNational Institute for Lasers, Plasma and Radiation Physics, P.O. Box MG 36, 077125 Bucharest, RomaniaNational Institute for Lasers, Plasma and Radiation Physics, P.O. Box MG 36, 077125 Bucharest, RomaniaNational Institute for Lasers, Plasma and Radiation Physics, P.O. Box MG 36, 077125 Bucharest, RomaniaOvidius University of Constanta, P.O. Box 8600, 900527 Constanta, RomaniaOvidius University of Constanta, P.O. Box 8600, 900527 Constanta, RomaniaNational Institute of Materials Physics, P.O. Box MG 7, 077125 Bucharest, RomaniaNational Institute of Materials Physics, P.O. Box MG 7, 077125 Bucharest, RomaniaCentre for Fundamental and Advanced Technical Research, Romanian Academy, Timisoara Branch, Bd. Mihai Viteazul 24 RO, 300223 Timisoara, RomaniaThe 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 (γ-Fe2O3) and titania (TiO2) 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 Fe2O3 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 TiCl4- (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.http://dx.doi.org/10.1155/2008/604181 |
| spellingShingle | R. Alexandrescu I. Morjan F. Dumitrache M. Scarisoreanu I. Soare C. Fleaca R. Birjega E. Popovici L. Gavrila G. Prodan V. Ciupina G. Filoti V. Kuncser L. Vekas Photochemistry Aspects of the Laser Pyrolysis Addressing the Preparation of Oxide Semiconductor Photocatalysts International Journal of Photoenergy |
| title | Photochemistry Aspects of the Laser Pyrolysis Addressing the Preparation of Oxide Semiconductor Photocatalysts |
| title_full | Photochemistry Aspects of the Laser Pyrolysis Addressing the Preparation of Oxide Semiconductor Photocatalysts |
| title_fullStr | Photochemistry Aspects of the Laser Pyrolysis Addressing the Preparation of Oxide Semiconductor Photocatalysts |
| title_full_unstemmed | Photochemistry Aspects of the Laser Pyrolysis Addressing the Preparation of Oxide Semiconductor Photocatalysts |
| title_short | Photochemistry Aspects of the Laser Pyrolysis Addressing the Preparation of Oxide Semiconductor Photocatalysts |
| title_sort | photochemistry aspects of the laser pyrolysis addressing the preparation of oxide semiconductor photocatalysts |
| url | http://dx.doi.org/10.1155/2008/604181 |
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