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 NO bond strength. It has been proposed that the nitrite species are responsible for the SnO 2 response in the presence of NO 2 traces.
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Sergent et al. (2006) studied this question.
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