<i>In situ</i> Raman spectroscopy study of NO₂ adsorption onto nanocrystalline tin(IV) oxide

Abstract

Abstract A study of the adsorption of NO 2 on a nanocrystalline tin(IV) oxide powder was carried out in situ by Raman spectroscopy. Heat treatment up to 300 °C of the sample in NO 2 revealed the complexity of the surface reactions. Thus, numerous NO x adsorbed species were evidenced such as weakly adsorbed nitrates, NO 2 dimers, nitrites, bridging and various bidentate nitrates. The stability of these last species has been related to the NO bond strength. It has been proposed that the nitrite species are responsible for the SnO 2 response in the presence of NO 2 traces. Copyright © 2006 John Wiley &amp; Sons, Ltd.