A new type of gas sensor based on thermionic charge carrier emission

Citation
T. Schwebel et al., A new type of gas sensor based on thermionic charge carrier emission, SENS ACTU-B, 68(1-3), 2000, pp. 157-161
Citations number
5
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
SENSORS AND ACTUATORS B-CHEMICAL
ISSN journal
0925-4005 → ACNP
Volume
68
Issue
1-3
Year of publication
2000
Pages
157 - 161
Database
ISI
SICI code
0925-4005(20000825)68:1-3<157:ANTOGS>2.0.ZU;2-1
Abstract
This paper presents investigations on DC emission currents from heated surf aces at ambient pressure for the purpose of gas sensing. Since applied gase s alter the work function (WF) of a material, the emitted electron current changes and becomes gas sensitive. Gas sensitive effects were identified as being dependent upon the emission material used. In contrast to vacuum con ditions, additional effects arise from interactions among electrons, ions a nd atoms. Consequently, the electrical behaviour at atmospheric pressure is completely different. This paper presents preliminary results on this new gas sensing principle with materials such as barium nitrate and scandium ox ide. (C) 2000 Elsevier Science S.A. All rights reserved.