Akaganeite(B-FeOOH) nanorods of dimensions 15 nm diameter and 200 nm length were prepared by aqueous synthesis. Charge carrier dynamics following femtosecond excitation displays three timescales. The first is a sub-picosecond decay of initially excited carriers to the band edge followed by trapping or nonradiative decay within 2 ps. The trapped electrons and holes persist for significantly longer times (at least tens-of-ps), similar to previous results from a-Fe2O3 materials. The short carrier lifetimes in these materials are attributed to fast trapping to Fe d-d and midgap states.
Revised: January 17, 2008 |
Published: March 5, 2007
Citation
Joly A.G., G. Xiong, C.M. Wang, D.E. McCready, K.M. Beck, and W.P. Hess. 2007.Synthesis and Photoexcited Charge Carrier Dynamics of beta-FeOOH Nanorods.Applied Physics Letters 90, no. 10:Art. No. 103504.PNNL-SA-52077.doi:10.1063/1.2711395