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Identification of oxygen vacancy types from Raman spectra of SnO 2 nanocrystals
Author(s) -
Liu L. Z.,
Li T. H.,
Wu X. L.,
Shen J. C.,
Chu P. K.
Publication year - 2012
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.4078
Subject(s) - raman spectroscopy , nanocrystal , annealing (glass) , oxygen , vacancy defect , materials science , analytical chemistry (journal) , hydrothermal circulation , chemistry , nanotechnology , crystallography , chemical engineering , optics , physics , organic chemistry , engineering , chromatography , composite material
Raman spectra acquired from spherical SnO 2 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 O 2 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 SnO 2 nanocrystals. Copyright © 2012 John Wiley & Sons, Ltd.