HREELS study of Au/Fe2O3 thick film gas sensors

被引：26

作者：

Neri, G

Bonavita, A

Galvagno, S

Caputi, L

Pacilè, D

Marsico, R

Papagno, L

机构：

[1] Univ Messina, Dipartimento Chim Ind & Ingn Mat, I-98166 Messina, Italy

[2] Univ Cosenza, Dipartimento Fis, Cosenza, Italy

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2001年 / 80卷 / 03期

关键词：

HREELS; thick films; CO gas sensors; Au/iron oxide;

D O I：

10.1016/S0925-4005(01)00905-4

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

CO gas sensors based on Au-doped/Fe2O3 thick films were studied in ultra-high-vacuum (UHV) by high resolution electron energy loss spectroscopy (HREELS). Several adsorbed species were identified on HREEL spectra collected at room temperature on thick films annealed at different temperatures. Among these, carboxylate and formate species were postulated as intermediates of the complex reactions occurring on the surface between carbon monoxide and oxygen. The catalytic and sensing properties of the Au/iron oxide samples towards CO have been also investigated showing the better performances of the co-precipitated samples in comparison to impregnated ones and the influence of annealing temperature. Data reported were correlated to the presence of oxygenate intermediates detected by HREELS. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：222 / 228

页数：7

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[1] STRONG MODE-SELECTIVE RESONANT VIBRATIONAL-EXCITATION IN CHEMISORBED MOLECULES - AN ELECTRON-ENERGY-LOSS SPECTROSCOPY STUDY OF HCOO GAAS(100) [J].