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Publication Detail
Surface ligand assisted valence change in ceria nanocrystals
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Zhang J, Naka T, Ohara S, Kaneko K, Trevethan T, Shluger A, Adschiri T
  • Publisher:
    AMER PHYSICAL SOC
  • Publication date:
    06/07/2011
  • Journal:
    PHYS REV B
  • Volume:
    84
  • Issue:
    4
  • Print ISSN:
    1098-0121
  • Language:
    EN
  • Keywords:
    LOW-INDEX SURFACES, SUPERCRITICAL WATER, OXIDE NANOPARTICLES, HYDROTHERMAL SYNTHESIS, ELECTRONIC-STRUCTURE, OXYGEN-CONTENT, CEO2, PARTICLES, SPECTROSCOPY, TRANSITION
  • Addresses:
    Zhang, J
    Tohoku Univ
    Inst Multidisciplinary Res Adv Mat
    Sendai
    Miyagi
    9808577
    Japan

    Natl Inst Mat Sci
    Tsukuba
    Ibaraki
    3050047
    Japan

    Osaka Univ
    Joining & Welding Res Inst
    Ibaraki
    Osaka
    5670047
    Japan

    UCL
    Dept Phys & Astron
    London
    WC1E 6BT
    England
Abstract
In this report, we used x-ray absorption, electron energy-loss, and magnetic analyses to demonstrate the effect of modification of ceria (CeO2-delta) 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-delta nanocrystal.
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