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Titolo:
TEMPERATURE DEPENDENCIES OF SENSITIVITY AND SURFACE CHEMICAL-COMPOSITION OF SNOX GAS SENSORS
Autore:
GAGGIOTTI G; GALDIKAS A; KACIULIS S; MATTOGNO G; SETKUS A;
Indirizzi:
CNR,ICMAT,CP 10 I-00016 MONTEROTONDO ITALY LITHUANIA ACAD SCI,INST SEMICOND PHYS VILNIUS 232600 LITHUANIA
Titolo Testata:
Sensors and actuators. B, Chemical
fascicolo: 1-3, volume: 25, anno: 1995,
pagine: 516 - 519
SICI:
0925-4005(1995)25:1-3<516:TDOSAS>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOTOEMISSION; CHEMISTRY; FILMS;
Keywords:
CARBON MONOXIDE SENSORS; GAS SENSORS; TIN OXIDE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
G. Gaggiotti et al., "TEMPERATURE DEPENDENCIES OF SENSITIVITY AND SURFACE CHEMICAL-COMPOSITION OF SNOX GAS SENSORS", Sensors and actuators. B, Chemical, 25(1-3), 1995, pp. 516-519

Abstract

The electrical resistivity response to CO gas exposure versus temperature has been measured for different types of SnOx-based gas sensors. The chemical composition of the sensor surfaces and the electronic structure of the valence band are investigated by X-ray photoelectron spectroscopy and scanning Auger microscopy techniques, with the aim of explaining resistivity changes in terms of the surface oxidation/reduction mechanism. The samples are treated by Ar+ sputtering, thermal annealing in UHV and oxygen at various temperatures up to 400 degrees C. Anultrathin Pt overlayer, which enhances the gas sensitivity in a low operating temperature range, is found to be very porous. The band-gap states induced by oxygen vacancies and adsorbed hydroxyl groups are revealed by valence-band spectra. The resistivity changes of the sensors due to exposure to reducing or oxidizing gases are caused more by the changes of the surface-defect density than by the variation of excess surface charge due to oxygen adsorption.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 06:27:24