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Title: Investigation of activated oxygen molecules on the surface of Y{sub 2}O{sub 3} nanocrystals by Raman scattering

Activation of surface oxygen molecules on cubic Y{sub 2}O{sub 3} nanocrystals (NCs) is investigated. As the annealing temperature under O{sub 2} is increased, the strong Raman band at 965 cm{sup −1} previously never assigned weakens gradually, while the intensity of the 378 cm{sup −1} Raman band arising from Y{sup 3+}-O{sup 2−} vibration increases. X-ray diffraction reveals no structural change during annealing and energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and theoretical calculation suggest that the interstitial oxygen O{sub 2}{sup 2−} connected to the F centers gives rise to the 965 cm{sup −1} Raman band. The results provide direct evidence of the existence of activated oxygen ions on Y{sub 2}O{sub 3} NCs.
Authors:
; ; ;  [1] ;  [1] ;  [2] ;  [3]
  1. Laboratory of Modern Acoustics, MOE, Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210093 (China)
  2. (China)
  3. Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong (China)
Publication Date:
OSTI Identifier:
22218112
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 9; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; ADMINISTRATIVE PROCEDURES; ANNEALING; F CENTERS; INTERSTITIALS; MOLECULES; NANOSTRUCTURES; OXYGEN; OXYGEN IONS; RAMAN EFFECT; RAMAN SPECTRA; SURFACES; X RADIATION; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY; X-RAY SPECTROSCOPY; YTTRIUM IONS; YTTRIUM OXIDES