Surface ligand assisted valence change in ceria nanocrystals

J. Zhang, T. Naka, S. Ohara, K. Kaneko, T. Trevethan, A. Shluger, and T. Adschiri
Phys. Rev. B 84, 045411 – Published 6 July 2011

Abstract

In this report, we used x-ray absorption, electron energy-loss, and magnetic analyses to demonstrate the effect of modification of ceria (CeO2δ) 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 CeO2δ nanocrystal.

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  • Received 10 March 2011

DOI:https://doi.org/10.1103/PhysRevB.84.045411

©2011 American Physical Society

Authors & Affiliations

J. Zhang1, T. Naka1,2,*, S. Ohara1,3, K. Kaneko4,5, T. Trevethan6,7, A. Shluger6,7, and T. Adschiri6

  • 1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
  • 2National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
  • 3Joining and Welding Research Institute, Osaka University, Ibaraki, Osaka 567-0047, Japan
  • 4Department of Materials Science & Engineering, Kyushu University, Fukuoka 819-0395, Japan
  • 5Core Research for Evolutional Science and Technology, Kyushu University, Fukuoka 819-0395, Japan
  • 6WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 7Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom

  • *naka.takashi@nims.go.jp

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Issue

Vol. 84, Iss. 4 — 15 July 2011

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