Regensburg 2002 – wissenschaftliches Programm

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O: Oberflächenphysik

O 39: Nanostrukturen (II)

O 39.1: Vortrag

Freitag, 15. März 2002, 11:15–11:30, H44

Surface oxidation of SnO2x nanoparticles — •Ramasamy Ramamoorthy1,2, Marcus Kennedy1, Hermann Nienhaus2, Axel Lorke2, Einar Kruis1, and Heinz Fißan11Prozess-und Aerosolmesstechnik — 2Laboratorium für Festkörperphysik, Gerhard-Mercator Universität Duisburg

The high surface-to-volume ratio of the nanoparticles enables improving the sensitivity of the SnO2 gas sensors. As a little is known about the surface chemistry of tin oxide nanoparticles, the study of their surface stoichiometry has become an important aspect of understanding the sensing phenomena. We deposited mono-dispersed tin oxide nanoparticles with different stoichiometry and different size (10- 30 nm) on silicon substrates by an aerosol method. Auger electron and X-ray photoelectron spectroscopy were applied to the as-deposited and post heat-treated SnO2x nanoparticles. The results show that the oxygen content at the particle surfaces varies drastically after different heat treatments and the variation is influenced by the initial oxygen content, the time-temperature history of the heat treatments and the particle size. For a given heat treatment in air, the SnO gets oxidized and the SnO2 looses oxygen in the nanocrystalline state.

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