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Organically Hybridized SnO2 Sensors for Selective Detection of Gas Molecules

Published online by Cambridge University Press:  01 February 2011

Ichiro Matsubara ,
Kouta Hosono ,
Norimitsu Murayama ,
Woosuck Shin  and
Noriya Izu
Ichiro Matsubara
Affiliation:
National Institute of Advanced Industrial Science and Technology, Shimo-Shidami, Moriyama-ku, Nagoya 463–8560, Japan
Kouta Hosono
Affiliation:
National Institute of Advanced Industrial Science and Technology, Shimo-Shidami, Moriyama-ku, Nagoya 463–8560, Japan
Norimitsu Murayama
Affiliation:
National Institute of Advanced Industrial Science and Technology, Shimo-Shidami, Moriyama-ku, Nagoya 463–8560, Japan
Woosuck Shin
Affiliation:
National Institute of Advanced Industrial Science and Technology, Shimo-Shidami, Moriyama-ku, Nagoya 463–8560, Japan
Noriya Izu
Affiliation:
National Institute of Advanced Industrial Science and Technology, Shimo-Shidami, Moriyama-ku, Nagoya 463–8560, Japan
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Abstract

Gas sensors based on organically hybridized SnO2 films are demonstrated. Upon exposure to CO gas, the electrical resistance of the hybrid sensor with amino groups in the organic components increases (R-increasing response), whereas other reducing gases such as H2 and CH4 gases cause the decreasing in the sensor resistance. For the n-type semiconductors like SnO2, the R-increasing response cannot be explained by the ordinary combustion mechanism. The appearance of the anomalous R-increasing response to CO gas can be controlled by the functional groups of the organic component. The hybrid sensor with hydroxy groups also exhibits the R-increasing response to CO gas, whereas it is not observed for the sensor with alkyl groups. The hybridization can improve gas selectivity of the SnO2 semiconducting gas sensors.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 785: Symposium D – Materials and Devices for Smart Systems , 2003 , D14.9
Copyright
Copyright © Materials Research Society 2004

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References

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