Surface ligand assisted valence change in ceria nanocrystals

J. Zhang, T. Naka, S. Ohara, K. Kaneko, T. Trevethan, A. Shluger, T. Adschiri

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)

    Abstract

    In this report, we used x-ray absorption, electron energy-loss, and magnetic analyses to demonstrate the effect of modification of ceria (CeO 2-δ) nanocrystals with a particle size D= 3.5-14 nm by oleic acid surface ligands. We observe a shift of the electronic state of the cerium ions from tetra to trivalent state as the surface density of the ligand molecules is increased. The valence state of cerium in the nanocrystal is strongly correlated with the number of ligand molecules bound to the surface of the ceria nanocrystals. One oxygen vacancy is stabilized by 5-6 ligand molecules bound on a CeO2-δ nanocrystal.

    Original languageEnglish
    Article number045411
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume84
    Issue number4
    DOIs
    Publication statusPublished - Jul 6 2011

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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