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Titolo:
Improvement of SO2 sensing properties of WO3 by noble metal loading
Autore:
Shimizu, Y; Matsunaga, N; Hyodo, T; Egashira, M;
Indirizzi:
Nagasaki Univ, Fac Engn, Dept Mat Sci & Engn, Nagasaki 8528521, Japan Nagasaki Univ Nagasaki Japan 8528521 Sci & Engn, Nagasaki 8528521, Japan
Titolo Testata:
SENSORS AND ACTUATORS B-CHEMICAL
fascicolo: 1-2, volume: 77, anno: 2001,
pagine: 35 - 40
SICI:
0925-4005(20010615)77:1-2<35:IOSSPO>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
GAS SENSORS; TIN DIOXIDE; STABILIZED ZIRCONIA; SOLID-ELECTROLYTE; SULFUR-DIOXIDE; SENSITIVITY; ADDITIVES;
Keywords:
SO2; semiconductor gas sensor; WO3; Ag/WO3;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Shimizu, Y Nagasaki Univ, Fac Engn, Dept Mat Sci & Engn, 1-14 Bunkyo Machi, Nagasaki 8528521, Japan Nagasaki Univ 1-14 Bunkyo Machi Nagasaki Japan 8528521 , Japan
Citazione:
Y. Shimizu et al., "Improvement of SO2 sensing properties of WO3 by noble metal loading", SENS ACTU-B, 77(1-2), 2001, pp. 35-40

Abstract

SO2 sensing properties of several semiconductor metal oxides have been investigated in the temperature range of 100-800 degreesC. Each oxide exhibited complex temperature- and time-dependent SO2 response. Among the oxides tested, WO3 exhibited the highest SO2 sensitivity at 400 degreesC, accompanied by a resistance increase, but its resistance decreased in SO2 at temperatures higher than 500 degreesC. To improve the SO2 sensitivity of WO3, effect of a metal addition was also tested. Among the metals tested, the addition of 1.0 wt.% Ag was most effective for improving the sensitivity at 450 degreesC. In the case of the 1.0Ag/WO3, however, the sensor resistance decreased in SO2 over the whole temperature range studied. Thus, the addition of Ag led to changes in both the surface states of SO2-related adsorbates and the electronic interactions between the adsorbates and WO3. The resistance increase of WO3 upon exposure to SO2 at 400 degreesC was suggested to arisefrom the formation of SO2- at sites different from those for oxygen adsorbates, while the resistance increase of 1.0Ag/WO3 at 450 degreesC from the formation of SO42- On the Ag loaded due to the reaction of a gaseous SO2 molecule and two O-ad(2-) ions on the Ag. Interference from NO;? to the SO2 sensitivity was found to be more significant in the case of 1.0Ag/WO3. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/09/20 alle ore 07:03:57