Abstract: Nanosized powders FeOx/Al2O3 with the Fe loading of 0.0-5.0 wt% were synthesized by laser vaporization using a cw CO2 laser. XRF, HRTEM, XRD and PL spectroscopy methods were used to study the morphology, chemical and phase composition, as well as the luminescent properties of the resulting FeOx/Al2O3 nanopowders with the average particle size of dm ∼9 nm. The results acquired for FeOx/Al2O3 nanosized systems were compared with the data for xFe/γPb-Al2O3 powders ([x] = 0.0 - 5.0 wt%) obtained by incipient wetness impregnation of γPb-Al2O3, which in turn was synthesized by the sol-gel method. XRD analysis shows that, in contrast to samples of the xFe/γPb-Al2O3 series, FeOx/Al2O3 nanopowders do not form the Fe2O3 phase at any iron concentrations. An analysis of the PL, PLE spectra and the PL decay kinetics of Fe3+ ions in FeOx/Al2O3 samples reveals the presence of Fe3+ centres located in the disordered environment of the subsurface layers of Al2O3 nanocrystallites, predominantly in the tetrahedral coordination, which is not detected for the xFe/γPb-Al2O3 series.

Cite: Baronskiy M.G. , Kostyukov A.I. , Snytnikov V.N.
Detection of Fe3+ Sites in FeOx/Al2O3 Nanopowders by Photoluminescence Spectroscopy
AIP Conference Proceedings. 2024. V.3246. 020001 :1-7. DOI: 10.1063/5.0244056 Scopus AN OpenAlex

Dates:

Published online:

Nov 7, 2024

Identifiers:

Scopus:	2-s2.0-85209633033
Chemical Abstracts:	2024:2532101
OpenAlex:	W4404135369

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