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Titolo:
Effect of surface modification on NO2 sensing properties of SnO2 varistor-type sensors
Autore:
Shimizu, Y; Di Bartolomeo, E; Traversa, E; Gusmano, G; Hyodo, T; Wada, K; Egashira, M;
Indirizzi:
Nagasaki Univ, Fac Engn, Dept Mat Sci & Engn, Nagasaki 8528521, Japan Nagasaki Univ Nagasaki Japan 8528521 Sci & Engn, Nagasaki 8528521, Japan Univ Roma Tor Vergata, Dept Chem Sci & Technol, I-00133 Rome, Italy Univ Roma Tor Vergata Rome Italy I-00133 & Technol, I-00133 Rome, Italy Sasebo Natl Coll Technol, Dept Biochem & Chem, Nagasaki 8571193, Japan Sasebo Natl Coll Technol Nagasaki Japan 8571193 Nagasaki 8571193, Japan
Titolo Testata:
SENSORS AND ACTUATORS B-CHEMICAL
fascicolo: 2-3, volume: 60, anno: 1999,
pagine: 118 - 124
SICI:
0925-4005(19991123)60:2-3<118:EOSMON>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
GAS SENSORS; THIN-FILMS; OXIDE;
Keywords:
varistor-type sensors; nonlinearity; SnO2; surface modification; NO2;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
19
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., "Effect of surface modification on NO2 sensing properties of SnO2 varistor-type sensors", SENS ACTU-B, 60(2-3), 1999, pp. 118-124

Abstract

NO2 sensing properties of SnO2-based varistor-type sensors have been investigated in the temperature range of 400-650 degrees C and in the NO2 concentration range of 15-30 ppm. Pure SnO2 exhibited a weak nonlinear I-V characteristic in air, but clear nonlinearity in NO2 at 450 degrees C. The breakdown voltage of SnO2 shifted to a high electric field upon exposure to NO2 and the magnitude of the shift was well correlated with NO2 concentration. Thus, SnO2 exhibited some sensitivity to NO2 as a varistor-type sensor. WhenSnO2 particles coated with a SiO2 thin film were used as a raw material for fabricating a varistor, the breakdown voltage in air was approximately the double that of pure SnO2 and the sensitivity to 15 ppm NO2 was enhanced slightly. However, the sensitivity to 30 ppm NO2 decreased. The Cr2O3-loading on SnO2 also led to an increase in the breakdown voltage in air, but the Cr2O3 addition was not effective for promoting the NO? sensitivity under the present experimental conditions. (C) 1999 Elsevier Science S.A. All rights reserved.

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Documento generato il 01/10/20 alle ore 16:17:45