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Proceedings Paper

Dual contribution of FTIR spectroscopy to nanoparticles characterization: surface chemistry and electrical properties
Author(s): Marie-Isabelle Baraton; Lhadi Merhari
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Paper Abstract

In a combined approach toward the optimization of chemical gas sensors, Fourier transform infrared spectroscopy is used to investigate in situ the surface reactions taking place at the surface of semiconductor nanoparticles and to simultaneously monitor the variations of the free-carrier density. The correlation between the surface reactions and the changes in the infrared absorbance under gas adsorption/desorption cycles gives information on the chemical phenomena responsible for electrical conductivity variations and therefore for the gas detection. Interaction of CO and NOX with tin oxide nanoparticles is presented and discussed. While the chemical reactions leading to the increase of the electrical conductivity under CO adsorption are relatively straightforward, the adsorption of NOX is much more complex. It is demonstrated that, although generating a strong increase of the electrical conductivity, the NOX adsorption on a fresh tin oxide surface is not fully reversible and actually poisons the surface. Subsequent NOX adsorptions lead to reversible chemical reactions even though the electrical response of the sensor is weaker.

Paper Details

Date Published: 11 October 2007
PDF: 10 pages
Proc. SPIE 6768, Nanomaterials Synthesis, Interfacing, and Integrating in Devices, Circuits, and Systems II, 676806 (11 October 2007); doi: 10.1117/12.736988
Show Author Affiliations
Marie-Isabelle Baraton, SPCTS-CNRS, Univ. de Limoges (France)
Lhadi Merhari, CERAMEC R&D (France)

Published in SPIE Proceedings Vol. 6768:
Nanomaterials Synthesis, Interfacing, and Integrating in Devices, Circuits, and Systems II
Nibir K. Dhar; Achyut K. Dutta; M. Saif Islam, Editor(s)

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