Cobalt nanograins effect on the ozone detection by WO3 sensors

被引：37

作者：

Belkacem, W. ^{[2
]}

Labidi, A. ^{[3
]}

Guerin, J. ^{[1
]}

Mliki, N. ^{[2
]}

Aguir, K. ^{[1
]}

机构：

[1] Univ Paul Cesanne, Fac Sci & Tech St Jerome S152, UMR CNRS 6242, IM2NP, F-13397 Marseille, France

[2] Univ Tunis El Manar, Fac Sci, LMOP, Tunis, Tunisia

[3] Univ 7 novembre, IPEST, URPSC, Tunis, Tunisia

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2008年 / 132卷 / 01期

关键词：

metallic oxide gas sensors; WO3; cobalt nanograins; selectivity; ozone;

D O I：

10.1016/j.snb.2008.01.023

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A small quantity of cobalt nanograins deposited on the surface of WO3 sensors produces an important change in the WO3 conductance. Indeed, the cobalt changes the conduction type of the sensors from n to p-type. An increase in conductance of the WO3 sensors under ozone is thus observed. This behaviour was investigated for two added quantities of deposited cobalt (15 angstrom and 30 angstrom). The modified sensors were tested under ozone before and after an annealing process under dry air at a temperature of 673 K for 1.5 h. The obtained response shape and mechanisms to ozone were explained by chemical reactions related to oxidation of the cobalt incorporated which can probably occur during the annealing process. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：196 / 201

页数：6

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