In situ infrared emission spectroscopic study of the adsorption of H2O andhydrogen-containing gases on Ga2O3 gas sensors

Citation
R. Pohle et al., In situ infrared emission spectroscopic study of the adsorption of H2O andhydrogen-containing gases on Ga2O3 gas sensors, SENS ACTU-B, 68(1-3), 2000, pp. 151-156
Citations number
16
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
151 - 156
Database
ISI
SICI code
0925-4005(20000825)68:1-3<151:ISIESS>2.0.ZU;2-D
Abstract
Infrared emission spectroscopy (IRES) was used for studying in situ gas-sur face interactions and adsorbed species on Ga2O3 at elevated temperatures us ed fur gas sensors. Regarding the permanent presence of humidity in most ga s sensor applications, the interaction of H2O with the sensor surface was o bserved under working conditions in order to emphasize the benefits of IRES for the understanding of gas sensing mechanisms. The coadsorption of water and H-2,C2H4, acetone and ethanol was investigated to point out the role o f humidity in the sensitive reactions to organic gases. Screen printed Ga2O 3 films were studied in the temperature range from 250 degrees C up to 650 degrees C. These results were correlated with simultaneous conductivity mea surements. The evident influence of the addition of water on the surface ch emistry of Ga2O3 during the adsorption of hydrogen-containing gases is conf irmed by this work. (C) 2000 Elsevier Science S.A. All rights reserved.