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Titolo:
In situ diffuse reflectance infrared spectroscopy study of CO adsorption on SnO2
Autore:
Emiroglu, S; Barsan, N; Weimar, U; Hoffmann, V;
Indirizzi:
Univ Tubingen, Inst Phys & Theoret Chem, D-72076 Tubingen, Germany Univ Tubingen Tubingen Germany D-72076 t Chem, D-72076 Tubingen, Germany
Titolo Testata:
THIN SOLID FILMS
fascicolo: 2, volume: 391, anno: 2001,
pagine: 176 - 185
SICI:
0040-6090(20010716)391:2<176:ISDRIS>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
GAS SENSORS; OPTIMIZATION; SURFACES; GEL;
Keywords:
SnO2; diffuse reflectance infrared-spectroscopy (DRIFT); CO-adsorption;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Emiroglu, S Univ Tubingen, Inst Phys & Theoret Chem, Morgenstelle 8, D-72076 Tubingen,Germany Univ Tubingen Morgenstelle 8 Tubingen Germany D-72076 Germany
Citazione:
S. Emiroglu et al., "In situ diffuse reflectance infrared spectroscopy study of CO adsorption on SnO2", THIN SOL FI, 391(2), 2001, pp. 176-185

Abstract

The surface interaction between differently prepared tin oxide samples andCO was studied by Diffuse Reflectance Infrared Fourier Transform (DRIFT)-spectroscopy at room temperature. As samples, commercial powders (Merck) andhome-made powders obtained by a sol-gel preparation were used. Several bands corresponding to isolated and rooted OH groups, coordinated water and condensed water in two forms: ordered lavers of water molecules and water in the liquid form, were found. Their appearance and intensity depended on thesample origin and storing conditions. Moreover, the spectra of all samplesshow bands corresponding to different hydrated protons (H3O+, H5O2+) and carbonate ions of different intensities. To get information about the interaction between SnO2 powders and CO, in-situ measurements were conducted. We found that differently bound water and specific surface OH-groups react with CO and that surface carbonate ions dissociate because of acidic intermediate products. As a result, different bands corresponding to physisorbed CO appear at approximately 2200 cm(-1), together with changes in the region corresponding to covalent bound chelating and bridging bidentate carbonates and carboxylate (between 1700 and 1000 cm(-1)). (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 05/04/20 alle ore 04:03:58