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Titolo:
Effect of texture and annealing treatments in SnO2 and Pd/SnO2 gas sensor materials
Autore:
Jimenez, VM; Espinos, JP; Gonzalez-Elipe, AR;
Indirizzi:
Univ Sevilla, CSIC, Inst Ciencia Mat Sevilla, Seville 41092, Spain Univ Sevilla Seville Spain 41092 encia Mat Sevilla, Seville 41092, Spain Dept Quim Inorgan, Seville 41092, Spain Dept Quim Inorgan Seville Spain 41092 Quim Inorgan, Seville 41092, Spain
Titolo Testata:
SENSORS AND ACTUATORS B-CHEMICAL
fascicolo: 1-3, volume: 61, anno: 1999,
pagine: 23 - 32
SICI:
0925-4005(199912)61:1-3<23:EOTAAT>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
THIN-FILMS; CONDUCTANCE RESPONSE; POLYCRYSTALLINE TIN; SURFACE; MODEL; CHEMISTRY; PALLADIUM; DIOXIDE; XPS; O2;
Keywords:
XPS; SnO2; Pd/SnO2; gas sensor; texture of particles; conductance changes;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Gonzalez-Elipe, AR Univ Sevilla, CSIC, Inst Ciencia Mat Sevilla, Avda AmerVespucio S-N, Seville 41092, Spain Univ Sevilla Avda Amer Vespucio S-N Seville Spain 41092
Citazione:
V.M. Jimenez et al., "Effect of texture and annealing treatments in SnO2 and Pd/SnO2 gas sensor materials", SENS ACTU-B, 61(1-3), 1999, pp. 23-32

Abstract

The chemical reactivity of a series of SnO2 materials with different textures has been studied by XPS. A nanocrystalline SnO2 (n-SnO2) powder, a powder sample with a crystal size of several microns and a very compact thin film have been chosen for this comparative study. It is found that the degreeof reduction upon heating in H-2 (i.e., percentage of Sn2+/Sn-0) decreaseswith the degree of compaction of the samples. Thus, while in an n-SnO2 powder a 298 reduction is obtained after heating in H-2 at 773 K, a negligiblereduction was found for the compact SnO2 thin film prepared by ion beam-induced CVD (IBICVD). This latter material has been chosen as a suitable substrate to characterize the state and function of palladium in Pd/SnO2 sensors. Palladium was added onto the SnO2 surface in the form of a PdCl2 salt. Then, the sample was subjected to different thermal activation processes. Conductivity measurements at different temperatures and under several pressures of H-2 and O-2 have been carried out with the samples. Texture and previous treatments have been found to be critical factors determining the gas sensing properties of SnO2 and Pd/SnO2 samples. A correlation is intended between the characteristics of the Pd 3d XPS signal after the different thermal treatments and the conductance response of the Pd/SnO2 system towards the exposure to H-2/O-2 cycles. (C) 1999 Elsevier Science S.A. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 21:25:55