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Titolo:
Surface composition and electrical conductivity of La2CuO4 and CuO composite on exposure to ppm level H2S
Autore:
Aono, H; Sakamoto, M; Sadaoka, Y;
Indirizzi:
Ehime Univ, Fac Engn, Dept Mat Sci & Engn, Matsuyama, Ehime 7908577, JapanEhime Univ Matsuyama Ehime Japan 7908577 Matsuyama, Ehime 7908577, Japan Yamagata Univ, Fac Sci, Dept Mat Sci & Engn, Yamagata 9908560, Japan Yamagata Univ Yamagata Japan 9908560 Sci & Engn, Yamagata 9908560, Japan
Titolo Testata:
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
fascicolo: 12, volume: 108, anno: 2000,
pagine: 1052 - 1059
SICI:
0914-5400(200012)108:12<1052:SCAECO>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
PEROVSKITE-TYPE OXIDES; THERMAL-DECOMPOSITION; HETERONUCLEAR COMPLEXES; HYDROGEN-SULFIDE; SENSOR; HO; COPPER; YB;
Keywords:
La2CuO4CuO; H2S; XPS; SEM-Auger; XRD;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Aono, H Ehime Univ, Fac Engn, Dept Mat Sci & Engn, 3 Bunkyo Cho, Matsuyama, Ehime 7908577, Japan Ehime Univ 3 Bunkyo Cho Matsuyama Ehime Japan 7908577 08577, Japan
Citazione:
H. Aono et al., "Surface composition and electrical conductivity of La2CuO4 and CuO composite on exposure to ppm level H2S", J CERAM S J, 108(12), 2000, pp. 1052-1059

Abstract

A composite material containing La2CuO4 and CuO was directly synthesized by thermal decomposition of a heteronuclear CuLa(dhbaen)(NO3) nH(2)O complex, where dhbaen is N,N'-bis (3-hydroxysalicylidene)-ethylenediamine. The mean particle size was of the order of 200 nm for a sample decomposing at 800 degreesC. The exposure to 7.8 ppm H2S at 50 degreesC for 6 d (the exposure gas was alternately changed from air to 7.8 ppm H2S at 6 h intervals for 6 d) resulted in the formation of copper sulfide and lanthanum sulfate on thesurface. At 100 degreesC, the surfaces were mostly covered with both sulfide and sulfate. Lanthanum sulfate and copper sulfide, without copper sulfate, were formed at temperatures below 200 degreesC, Copper sulfate was detected when the sample was exposed at 250 degreesC. For samples exposed at 100degreesC, the atomic ratio determined by X-ray photoelectron spectroscopy (XPS) for [S (sulfate)]/[La] was 1.6 on the surface and decreased to 0.01 with increasing depth of Ar sputtering on the surface. The ratio of [S (sulfide]/[Cu] was 0.99 on the surface and decreased to about 0.45 upon Ar sputtering, However, [S(sulfate)]/[La] and [S(sulfide)]/[Cu] ratios on the surface were 0.03 and 0.39, respectively, for single-phase La2CuO4 prepared by the solid state reaction method after the exposure. It is concluded that thereactions of Cu and La in La2CuO4 with hydrogen sulfide are accelerated bythe presence of well-dispersed CuO.

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Documento generato il 09/04/20 alle ore 13:14:02