Electron small polarons and their mobility in iron (oxyhydr)oxide nanoparticles.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

  • Author: Katz, Jordan E, United States

    Earth Sciences Division, Lawrence Berkeley National Laboratory, United States

  • Author: Zhang, Xiaoyi, United States

    X-ray Science Division, Argonne National Laboratory, United States

  • Author: Attenkofer, Klaus, United States

    X-ray Science Division, Argonne National Laboratory, United States

  • Author: Chapman, Karena W, United States

    X-ray Science Division, Argonne National Laboratory, United States

  • Author: Frandsen, Cathrine

    Experimental surface - and nanomaterials physics, Department of Physics, Technical University of Denmark, Fysikvej, 2800, Kongens Lyngby, Denmark

  • Author: Zarzycki, Piotr, United States

    Chemical and Materials Sciences Division, Pacific Northwest National Laboratory (PNNL), United States

  • Author: Rosso, Kevin M, United States

    5Chemical and Materials Sciences Division, Pacific Northwest National Laboratory (PNNL), United States

  • Author: Falcone, Roger W, United States

    Department of Physics, University of California, Berkeley, United States

  • Author: Waychunas, Glenn A

  • Author: Gilbert, Benjamin, United States

    Earth Sciences Division, Lawrence Berkeley National Laboratory, United States

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Electron mobility within iron (oxyhydr)oxides enables charge transfer between widely separated surface sites. There is increasing evidence that this internal conduction influences the rates of interfacial reactions and the outcomes of redox-driven phase transformations of environmental interest. To determine the links between crystal structure and charge-transport efficiency, we used pump-probe spectroscopy to study the dynamics of electrons introduced into iron(III) (oxyhydr)oxide nanoparticles via ultrafast interfacial electron transfer. Using time-resolved x-ray spectroscopy and ab initio calculations, we observed the formation of reduced and structurally distorted metal sites consistent with small polarons. Comparisons between different phases (hematite, maghemite, and ferrihydrite) revealed that short-range structural topology, not long-range order, dominates the electron-hopping rate.
Original languageEnglish
JournalScience
Publication date2012
Volume337
Journal number6099
Pages1200-1203
ISSN0036-8075
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 8
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