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Infrared and Raman spectroscopic study of Sn-containing Zn/Al-layered double hydroxides

E. M. SEFTEL1,2,* , E. POPOVICI1, M. MERTENS3, P. COOL2, E. F. VANSANT2

Affiliation

  1. Department of Physical and Theoretical Chemistry and Materials Chemistry, “Al. I. Cuza” University of Iasi, Bvd. Carol I, no 11, 700506, Romania
  2. Laboratory of Adsorption and Catalysis, University of Antwerpen (CDE), Universiteitsplein 1, 2610 Wilrijk, Antwerpen, Belgium
  3. VITO Flemish Institute for Technological Research, Boeretang 200, B-2400, Belgium

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..

Keywords

Layered double hydroxides, Sn-containing; isomorphic substitution, FT-IR spectroscopy, Raman spectroscopy.

Submitted at: Nov. 7, 2008
Accepted at: Dec. 10, 2008

Citation

E. M. SEFTEL, E. POPOVICI, M. MERTENS, P. COOL, E. F. VANSANT, Infrared and Raman spectroscopic study of Sn-containing Zn/Al-layered double hydroxides, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 12, pp. 3477-3481 (2008)