Title
Infrared and Raman spectroscopic study of Sn-containing Zn/Al-layered double hydroxides Infrared and Raman spectroscopic study of Sn-containing Zn/Al-layered double hydroxides
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
article
Publication
Bucharest ,
Subject
Chemistry
Source (journal)
Journal of optoelectronics and advanced materials. - Bucharest
Volume/pages
10(2008) :12 , p. 3477-3481
ISSN
1454-4164
ISI
000262022500063
Carrier
E
Target language
English (eng)
Affiliation
University of Antwerp
Abstract
Zn/Al- and Zn/Al/Sn-LDHs were prepared by the co-precipitation method at constant pH. The LDH structure and the local environment of the tin cations were investigated using XRD and UV-vis DR methods. Band component analysis of both infrared and Raman spectra has been used for the detailed characterization. Raman spectroscopy proved to be more useful to distinguish between the different metal-OH stretching modes than FT-IR spectroscopy. The carbonate anions were found to be in a lowered symmetry. Changes in the spectral profile were observed when part of Al3 was replaced by Sn4 in the brucite-like structure. The shift of a band and the appearance of a weak shoulder at 498 cm(-1) in the Raman spectrum when the tin cations were involved indicated that small amounts of the tetravalent cations are segregated on the surface of the brucite-like sheets as very small regions of amorphous SnO2.
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