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Effect of surface modification on the electrical properties of TiO2 and SnO2 nanopowders

Published online by Cambridge University Press:  10 February 2011

Fabienne Chancel ,
Jérôme Tribout  and
Marie-Isabelle Baraton
Fabienne Chancel
Affiliation:
LMCTS, ESA 6015 CNRS, Faculty of Sciences, 123 Av. A. Thomas, F-87060 Limoges (France).
Jérôme Tribout
Affiliation:
LMCTS, ESA 6015 CNRS, Faculty of Sciences, 123 Av. A. Thomas, F-87060 Limoges (France).
Marie-Isabelle Baraton
Affiliation:
LMCTS, ESA 6015 CNRS, Faculty of Sciences, 123 Av. A. Thomas, F-87060 Limoges (France).
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Abstract

The surface modification of titania and tin dioxide nanopowders by hexamethyldisilazane and hexamethyldisiloxane grafting has been followed in situ by FT-IR spectroscopy. A grafting mechanism is proposed for both compounds and the formation of new surface species is discussed. Since TiO2 and SnO2 are widely used in chemical gas sensors due to their electrical properties, the respective behaviors of the non-grafted and grafted samples in reducing (CO) environment as well as the humidity effects are compared. Because the transmitted IR energy depends on the concentration of the free carriers, a correlation between the electrical conductivity variation and the perturbation of the IR spectra is attempted.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 501: Symposium FF – Surface Controlled Nanoscale Materials for High-Added… , 1997 , 89
Copyright
Copyright © Materials Research Society 1998

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References

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