Excited carrier dynamics of alpha-Cr2O3/alpha-Fe2O3 core-shell nanostructures |
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Authors: | Xiong Gang Joly Alan G Holtom Gary P Wang Chongmin McCready David E Beck Kenneth M Hess Wayne P |
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Institution: | Pacific Northwest National Laboratory, P.O. Box 999, K8-88, Richland, Washington 99352, USA. |
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Abstract: | In this work alpha-Cr(2)O(3)/alpha-Fe(2)O(3) core-shell polycrystalline nanostructures were synthesized by using alpha-Cr(2)O(3) nanoparticles as seed crystals during aqueous nucleation. The formation of alpha-Fe(2)O(3) polycrystallites on alpha-Cr(2)O(3) 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" alpha-Fe(2)O(3) 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. |
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