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Titolo:
CERAMIC THIN-FILMS BY SOL-GEL PROCESSING AS NOVEL MATERIALS FOR INTEGRATED HUMIDITY SENSORS
Autore:
TRAVERSA E; GNAPPI G; MONTENERO A; GUSMANO G;
Indirizzi:
UNIV ROMA TOR VERGATA,DIPARTIMENTO SCI & TECNOL CHIM,VIA RIC SCI I-00133 ROME ITALY CORIVE I-43100 PARMA ITALY UNIV PARMA,DIPARTIMENTO CHIM GEN & INORGAN I-43100 PARMA ITALY
Titolo Testata:
Sensors and actuators. B, Chemical
fascicolo: 1-2, volume: 31, anno: 1996,
pagine: 59 - 70
SICI:
0925-4005(1996)31:1-2<59:CTBSPA>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRICAL-PROPERTIES; NB2O5-DOPED TIO2; MGAL2O4; MICROSTRUCTURE; SENSITIVITY; CONDUCTION; MGCR2O4-TIO2; AL2O3;
Keywords:
HUMIDITY SENSORS; THIN FILMS; SOL-GEL; ALKALI-DOPED TIO2; IRON OXIDES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
54
Recensione:
Indirizzi per estratti:
Citazione:
E. Traversa et al., "CERAMIC THIN-FILMS BY SOL-GEL PROCESSING AS NOVEL MATERIALS FOR INTEGRATED HUMIDITY SENSORS", Sensors and actuators. B, Chemical, 31(1-2), 1996, pp. 59-70

Abstract

Thin films based on 10 at% alkali-doped TiO2 and on iron oxide with very large humidity sensitivity were prepared using a sol-gel technique. Prototype humidity sensors were prepared by depositing metal alkoxide solutions onto Al2O3 substrates with comb-type Au electrodes, by dip-coating and heating in air. Heating to 300 degrees C produces continuous films, free of porosity, which appear as layers covering the substrates, with no detectable grains. The humidity sensing electrical properties of the films were evaluated using electrochemical impedance spectroscopy (EIS) measurements. Resistance changes, although the films are dense, even larger than those reported for porous ceramics are recorded, as high as 9 and 8 orders of magnitude in the relative humidity range tested (4-87%), for the iron oxide and 10 at% K-doped titania films heated to 300 degrees C, respectively. These outstanding results are interpreted in terms of conduction mechanisms different from the mechanism usually accepted for porous ceramics. EIS results confirmed that, for 10 at% alkali-doped TiO2 films, charge carriers are alkali ions and not surface protons.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/10/20 alle ore 14:00:24