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Topics in Catalysis

, Volume 61, Issue 9–11, pp 784–791 | Cite as

Surface Characterization of NbO Islands Formed on Nb(100) by X-Ray Photoelectron Diffraction

  • A. Pancotti
  • J. Wang
  • A. C. S. A. Rezende
  • D. P. Santos
  • A. de Siervo
  • R. Landers
  • P. A. P. Nascente
Original Paper
  • 147 Downloads

Abstract

An ordered thin film of niobium oxide (NbO) was formed on the Nb(100) surface by heating the niobium single crystal at 1023 K for 2 min under an oxygen atmosphere. The surface composition was analyzed by X-ray photoelectron spectroscopy (XPS), and the surface structure was characterized by low energy electron diffraction (LEED) and X-ray photoelectron diffraction (XPD) generated by synchrotron radiation. Annealing at 1223 K in ultra-high vacuum yielded a reconstructed (3 × 1) LEED pattern. XPS measurements indicated that the surface comprised of metallic and oxidized niobium species. The comparison between experimental and theoretical XPD results indicated that 60% of the Nb(100) surface was covered by two-layered nanoislands of NbO, and 40% had bare patches.

Keywords

Niobium Niobium oxide Surface reconstruction X-ray photoelectron diffraction 

Notes

Acknowledgements

We would like to acknowledge the Brazilian research agencies Fundação de Amparo à Pesquisa do Estado de São Paulo – FAPESP and Conselho Nacional de Desenvolvimento Científico e Tecnológico – CNPq, for financial support, Fapeg-Pronem 07/2016 (23187), and the Brazilian Synchrotron Light Laboratory – LNLS (proposal # SGM 16978).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • A. Pancotti
    • 1
  • J. Wang
    • 2
  • A. C. S. A. Rezende
    • 1
  • D. P. Santos
    • 1
  • A. de Siervo
    • 3
  • R. Landers
    • 3
  • P. A. P. Nascente
    • 4
  1. 1.Unidade Acadêmica Especial de Ciências Exatas e Tecnológicas, Curso de FísicaUniversidade Federal de JataíJataíBrazil
  2. 2.College of ScienceDonghua UniversityShanghaiChina
  3. 3.Instituto de Física Gleb WataghinUniversidade Estadual de CampinasCampinasBrazil
  4. 4.Departamento de Engenharia de MateriaisUniversidade Federal de São CarlosSão CarlosBrazil

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