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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.55  No.2 (2006)  >  pp.165-168

Journal of the Society of Materials Science, Japan
<<Previous article Vol.55  No.2 (2006)   pp.165 - 168 Next article>>

A Trial of Smell Discrimination by SnO2 Gas Sensor

Akira FUJIMOTO1), Takeshi KANASHIMA2) and Masanori OKUYAMA2)
1) Dept. of Electrical and Computer Eng., Wakayama National College of Tech.
2) Graduate School of Eng. Sci., Osaka Univ.


We have measured the SnO2 gas sensor response for several alcoholic and carboxylic gases to discriminate smells. The experimental results show that each alcoholic gas gave the peculiar response of the sensor and the secondary polarization of the gases molecules affected strongly to the transient response of the sensor. The total heats of formations were calculated by molecular orbital method using SnO2 cluster to examine the surface reaction of the sensor. The calculating results show that the adsorption distance of the gas molecular from the sensor surface affected to the sensor sensitivity. We operated the sensor heated by rectangular and triangular pulse voltages to discriminate several kinds of smell. The triangular pulse with a rise velocity of 43 [mV/sec] gave us the largest delay time difference for various alcoholic gases. These results suggest that the smell selective sensor will be realized by using the SnO2 gas sensor.


Keyword:
Gas sensor, Smell discrimination, Molecular orbital calculation

Received: May 11, 2005
Published online: April 19, 2006
Copyright (c) 2006 by The Society of Materials Science, Japan

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