Excited Carrier Dynamics of α-Cr2O3/α-Fe2O3 Core−Shell Nanostructures

In this work α-Cr2O3/α-Fe2O3 core−shell polycrystalline nanostructures were synthesized by using α-Cr2O3 nanoparticles as seed crystals during aqueous nucleation. The formation of α-Fe2O3 polycrystallites on α-Cr2O3 surfaces was confirmed by X-ray diffraction, transmission electron microscopy, and e...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2006-08, Vol.110 (34), p.16937-16940
Main Authors: Xiong, Gang, Joly, Alan G, Holtom, Gary P, Wang, Chongmin, McCready, David E, Beck, Kenneth M, Hess, Wayne P
Format: Article
Language:English
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Summary:In this work α-Cr2O3/α-Fe2O3 core−shell polycrystalline nanostructures were synthesized by using α-Cr2O3 nanoparticles as seed crystals during aqueous nucleation. The formation of α-Fe2O3 polycrystallites on α-Cr2O3 surfaces was confirmed by X-ray diffraction, transmission electron microscopy, and energy-dispersive X-ray analysis. The excited-state relaxation dynamics of as-grown core−shell structures and “pure” α-Fe2O3 particles of the same size were measured with femtosecond transient absorption spectroscopy. The results show the carrier lifetimes decay within a few picoseconds regardless of sample. This is likely due to fast recombination/trapping of carriers to defects and iron d-states.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp062507n