TRANSITION BETWEEN NECK-CONTROLLED AND GRAIN-BOUNDARY-CONTROLLED SENSITIVITY OF METAL-OXIDE GAS SENSORS

Authors
WANG XD YEE SS CAREY WP
Citation
Xd. Wang et al., TRANSITION BETWEEN NECK-CONTROLLED AND GRAIN-BOUNDARY-CONTROLLED SENSITIVITY OF METAL-OXIDE GAS SENSORS, Sensors and actuators. B, Chemical, 25(1-3), 1995, pp. 454-457
Citations number
3
Categorie Soggetti
Engineering, Eletrical & Electronic","Instument & Instrumentation
Journal title
Sensors and actuators. B, Chemical → ACNP
ISSN journal
09254005
Volume
25
Issue
1-3
Year of publication
1995
Pages
454 - 457
Database
ISI
SICI code
0925-4005(1995)25:1-3<454:TBNAGS>2.0.ZU;2-Z
Abstract
This paper studies the principles of gas-modulated grain-size effects on the electrical conductivity and gas sensitivity of metal-oxide gas sensors. A model that combines both the grain-boundary and neck mechan isms is formulated based on the theories of thermionic emission and ju nction modulation. The gas sensitivity is quantitatively discussed as a function of grain size and chemisorbed gas concentration.