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Titolo:
AN EIS STUDY OF THE HUMIDITY-SENSITIVE ELECTRICAL-CONDUCTION OF ALKALI-DOPED TIO2 FILMS
Autore:
GUSMANO G; BIANCO A; MONTESPERELLI G; TRAVERSA E;
Indirizzi:
UNIV ROMA TOR VERGATA,DIPARTMENTO SCI & TECNOL CHIM I-00133 ROME ITALY UNIV ROMA TOR VERGATA,DIPARTMENTO SCI & TECNOL CHIM I-00133 ROME ITALY
Titolo Testata:
Electrochimica acta
fascicolo: 7-8, volume: 41, anno: 1996,
pagine: 1359 - 1368
SICI:
0013-4686(1996)41:7-8<1359:AESOTH>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
NB2O5-DOPED TIO2; SENSORS; TEMPERATURE; IMPEDANCE; CERAMICS; WATER;
Keywords:
HUMIDITY SENSORS; TIO2; THIN FILM; SOL-GEL; CONDUCTION MECHANISM; EIS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
G. Gusmano et al., "AN EIS STUDY OF THE HUMIDITY-SENSITIVE ELECTRICAL-CONDUCTION OF ALKALI-DOPED TIO2 FILMS", Electrochimica acta, 41(7-8), 1996, pp. 1359-1368

Abstract

This paper reports the study of the humidity-sensitive electrical properties of 10at% Li- and K-doped TiO2 films, which have been proposed as active materials for integrated humidity sensors, in comparison with pure TiO2 films. Prototype sensors have been prepared by depositing with a sol-gel technique dense TiO2-based films onto Al2O3 substrates with comb-type Au electrodes. The humidity-sensitive electrical behaviour of the films has been investigated using electrochemical impedancespectroscopy (EIS) at relative humidity (RH) values ranging from 4-87%. The variation of dielectric parameters as a function of frequency and RH has been evaluated to confirm the conduction mechanism. The pureTiO2 films show a moderate variation of the impedance with RH, while the alkali-doped films show a very large decrease in resistance and a nearly constant capacitance with increasing RH. The humidity sensing mechanism for pure TiO2 films is due to the proton hopping between water molecules adsorbed on oxide surfaces. A novel sensing mechanism is proposed for alkali-doped TiO2 films. Alkali ions directly participate in their PH-sensitive conduction, with a different mechanism for K+ and Li+ ions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 09:18:11