Dear All,
I observe splits of metal-oxygen stretching bands of some metal oxides (TiO2, ZnO, ZrO2, and WO3). Can these be related to variation of the oxygen defect density?
Journal of Advanced Ceramics 2013, 2(3): 260–265 ISSN 2226-4108
DOI: 10.1007/s40145-013-0069-6
Synthesis and optical characterization of porous ZnO
You might find some discussion for splits of ZnO stretching bands about the shift and split of the IR absorption band.
Metal oxides generally give absorption bands below 1000 cm-1 arising from interatomic vibrations. ex. ZnO Metal oxide has a band around 457 cm-1 corresponds to Zn-O bond. The peak positioned at 457 cm1 is attributed to the Zn–O stretching bonds. The peak at 457 cm-1 splits into two peaks positioned at 518 cm-1 and 682 cm-1 with the change of morphology. These results confirmed that Fourier transform infrared (FT-IR) spectrum was sensitive to variations in particle size, shape and morphology.
Electrons photogenerated in TiO2 and Pt/TiO2 catalysts were observed by time-resolved IR absorption spectroscopy. Transient IR absorption of an identical spectrum appeared on TiO2 and Pt/TiO2 irradiated by a 355 nm pump pulse.
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