Excited carrier dynamics of α-Cr2O3/α-Fe2O3 core-shell nanostructures

被引：20

作者：

Xiong, Gang ^{[1
]}

Joly, Alan G. ^{[1
]}

Holtom, Gary P. ^{[1
]}

Wang, Chongmin ^{[1
]}

McCready, David E. ^{[1
]}

Beck, Kenneth M. ^{[1
]}

Hess, Wayne P. ^{[1
]}

机构：

[1] Pacific NW Natl Lab, Richland, WA 99352 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2006年 / 110卷 / 34期

关键词：

D O I：

10.1021/jp062507n

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this work alpha-Cr2O3/R-Fe2O3 core-shell polycrystalline nanostructures were synthesized by using R-Cr2O3 nanoparticles as seed crystals during aqueous nucleation. The formation of alpha-Fe2O3 polycrystallites on R-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" R-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.

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收藏

页码：16937 / 16940

页数：4

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