Premium
Transition of chromium oxyhydroxide nanomaterials to chromium oxide: a hot‐stage Raman spectroscopic study
Author(s) -
Yang Jing Jeanne,
Martens Wayde N.,
Frost Ray L.
Publication year - 2011
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.2773
Subject(s) - raman spectroscopy , chromium , nanomaterials , hydrothermal circulation , transition metal , transmission electron microscopy , oxide , hydroxide , materials science , analytical chemistry (journal) , chemistry , crystallography , inorganic chemistry , nanotechnology , chemical engineering , metallurgy , optics , catalysis , physics , engineering , biochemistry , chromatography
The transition of disc‐like chromium hydroxide nanomaterials to chromium oxide nanomaterials has been studied by hot‐stage Raman spectroscopy. The structure and morphology of α‐CrO(OH) synthesised using hydrothermal treatment were confirmed by X‐ray diffraction (XRD) and transmission electron microscopy (TEM). The Raman spectrum of α‐CrO(OH) is characterised by two intense bands at 823 and 630 cm −1 attributed to ν 1 Cr III O symmetric stretching mode and the band at 1179 cm −1 attributed to Cr III OH δ deformation modes. No bands are observed above 3000 cm −1 . The absence of characteristic OH stretching vibrations may be due to short hydrogen bonds in the α‐CrO(OH) structure. Upon thermal treatment of α‐CrO(OH), new Raman bands are observed at 599, 542, 513, 396, 344 and 304 cm −1 , which are attributed to Cr 2 O 3 . This hot‐stage Raman study shows that the transition of α‐CrO(OH) to Cr 2 O 3 occurs before 350 °C. Copyright © 2010 John Wiley & Sons, Ltd.