Fabrication and characterization of Fe1.90Ti0.10O3 gas sensitive resistors for carbon monoxide

被引：5

作者：

Luthra, Vandna ^{[2
,3
]}

Pratt, Keith F. E. ^{[2
]}

Parkin, Ivan P. ^{[2
]}

Williams, David E. ^{[2
]}

Tandon, R. P. ^{[1
]}

机构：

[1] Univ Delhi, Dept Phys & Astrophys, Delhi 110007, India

[2] UCL, Dept Chem, London WC1H 0AJ, England

[3] Gargi Coll, Dept Phys, New Delhi 110049, India

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2009年 / 135卷 / 02期

关键词：

Fe2-xTixO3; Gas sensors; Resistive sensor of CO; THIN-FILMS; ELECTRICAL-PROPERTIES; SENSOR BEHAVIOR; CO; ALPHA-FE2O3; SELECTIVITY; TITANIUM; ETHANOL; IRON; SNO2;

D O I：

10.1016/j.snb.2008.09.023

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

An iron-titanium solid solution Fe1.90Ti0.10O3 was synthesized by a conventional ceramic route. The powder was incorporated into a gas-sensing device by screen printing a mixture of Fe1.90Ti0.10O3 and vehicle (Agmet ESL-400) onto an alumina tile. Heating the tile to 700 C removed the organic vehicle and left a porous, stable and uniform layer of Fe1.90Ti0.10O3. This oxide layer showed a reversible n-type change in resistance on exposure to varying concentrations of carbon monoxide, for which the interfering effect of water vapour was small. Titanium was strongly surface segregated, and reduction of Fe(III) to Fe(II) near the surface was found. The behaviour is interpreted with a Mars-van Krevelen model for adsorption and reaction on a complex surface defect. The possibility to control the behaviour through control of the surface segregation is inferred. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：430 / 435

页数：6

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