UCL  IRIS
Institutional Research Information Service
UCL Logo
Please report any queries concerning the funding data grouped in the sections named "Externally Awarded" or "Internally Disbursed" (shown on the profile page) to your Research Finance Administrator. Your can find your Research Finance Administrator at http://www.ucl.ac.uk/finance/research/post_award/post_award_contacts.php by entering your department
Please report any queries concerning the student data shown on the profile page to:

Email: portico-services@ucl.ac.uk

Help Desk: http://www.ucl.ac.uk/ras/portico/helpdesk
Publication Detail
Reduction of thin-film ceria on Pt(111) by supported Pd nanoparticles probed with resonant photoemission
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Matharu J, Cabailh G, Lindsay R, Pang CL, Grinter DC, Skala T, Thornton G
  • Publisher:
    ELSEVIER SCIENCE BV
  • Publication date:
    06/2011
  • Pagination:
    1062, 1066
  • Journal:
    SURF SCI
  • Volume:
    605
  • Issue:
    11-12
  • Print ISSN:
    0039-6028
  • Language:
    EN
  • Keywords:
    Ceria, Thin film, Resonant photoemission, Palladium, RESPES, XPS, RAY PHOTOELECTRON-SPECTROSCOPY, MODEL CATALYST, OXIDE, CEO2, SURFACES, DIOXIDE, SYSTEMS, XPS
  • Addresses:
    Thornton, G
    UCL
    London Ctr Nanotechnol
    London
    WC1H 0AJ
    England

    UCL
    Dept Chem
    London
    WC1H 0AJ
    England
Abstract
Local defects present in CeO2-x films result in a mixture of Ce3+ and Ce4+ oxidation states. Previous studies of the Ce 3d region with XPS have shown that depositing metal nanoparticles on ceria films causes further reduction, with an increase in Ce3+ concentration. Here, we compare the use of XPS and resonant photoemission spectroscopy (RESPES) to estimate the concentration of Ce3+ and Ce4+ in CeO2-x films grown on Pt (111), and the variation of this concentration as a function of Pd deposition. Due to the nature of the electronic structure of CeO2-x, resonant peaks are observed for the 4d-4f transitions when the photon energy matches the resonant energy; (hv = 121.0 eV) for Ce3+ and (hv = 124.5 eV) for Ce4+. This results in two discrete resonant photoemission peaks in valence band spectra. The ratio of the difference of these peaks with off-resonance scans gives an indication of the relative contribution of Ce3+. Results from RESPES indicate reduction of CeO2-x on deposition of Pd, confirming earlier findings from XPS studies. (C) 2011 Elsevier B.V. All rights reserved.
Publication data is maintained in RPS. Visit https://rps.ucl.ac.uk
 More search options
UCL Researchers
Author
Dept of Chemistry
Author
Dept of Chemistry
University College London - Gower Street - London - WC1E 6BT Tel:+44 (0)20 7679 2000

© UCL 1999–2011

Search by