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Temperature Dependent Sensitivity Inversion in SnO1.8:Pd Mixed Nanoparticle Layer Based CO Sensors

Published online by Cambridge University Press:  01 February 2011

I. Aruna  and
F. E. Kruis
I. Aruna
Affiliation:
[email protected], University of Duisburg-Essen, Institute of Nano Structures and Technology, Faculty of Engineering, Bismarkstrasse 81, Duisburg, 47057, Germany
F. E. Kruis
Affiliation:
[email protected], University of Duisburg-Essen, Institute of Nano Structures and Technology, Faculty of Engineering, 81 Bismarckstrasse, Duisburg, 47057, Germany
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Abstract

This study reports a novel observation of the temperature dependent inversion in the CO sensitivity of the nanoparticle layers consisting of homogeneously mixed monodispersed Pd and SnO1.8 nanoparticles synthesized via aerosol route. Ability of sensing CO of as low as 10 ppb in dry synthetic air has been observed with decrease in nanoparticle size (to 5 nm) in the samples mixed with Pd nanoparticles, as compared to samples without Pd nanoparticles which show no sensitivity to CO in ppb levels. In contrast to the conductivity increase in SnO1.8 in response to CO exposure in the absence of Pd, the mixed nanoparticle layers exhibit decrease in conductivity. With increase in the operating temperature (523 to 673 K) reversal in the sensitivity has been observed at higher CO concentrations. The observed behavior can be understood in terms of the physiochemical and electronic processes.

Keywords

nanoscalesensorsurface chemistry
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1056: Symposium HH – Nanophase and Nanocomposite Materials V , 2007 , 1056-HH04-11
Copyright
Copyright © Materials Research Society 2008

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