Surface ligand assisted valence change in ceria nanocrystals

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

Research output: Contribution to journalArticle

24 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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