Journal
JOURNAL OF RAMAN SPECTROSCOPY
Volume 43, Issue 10, Pages 1423-1426Publisher
WILEY
DOI: 10.1002/jrs.4078
Keywords
SnO2 nanocrystals; Raman spectroscopy; oxygen vacancies; annealing processing; density functional calculation
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Funding
- National Natural Science Foundation [2011CB922102, 60976063]
- Basic Research Programs of China [2011CB922102, 60976063]
- Postdoctoral Science Foundation of China [2011M500889, 1102001B]
- Jiangsu Province [2011M500889, 1102001B]
- PAPD
- Hong Kong Research Grants Council (RGC) General Research Fund (GRF) [CityU 112510]
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Raman spectra acquired from spherical SnO2 nanocrystals prepared by pulsed laser ablation and hydrothermal synthesis exhibit three oxygen-vacancy-related Raman modes at 234, 573, and 618?cm-1. The peak location and intensity vary with annealing temperature under O2 finally approaching those of bulk materials. Density functional calculation discloses that the three Raman modes stem from subbridging, in-plane, and bridging oxygen vacancies, respectively. Raman spectra can thus be used to discern different types of oxygen vacancies in SnO2 nanocrystals. Copyright (c) 2012 John Wiley & Sons, Ltd.
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