Insights into the Mechanism of Gas Sensor Operation

Since the development of the first models of gas detection on metal-oxide-based sensors much effort has been made to describe the mechanism responsible for gas sensing. Despite progress in recent years, a number of key issues remain the subject of controversy; for example, the disagreement between t...

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Bibliographic Details
Published inMetal Oxide Nanomaterials for Chemical Sensors pp. 3 - 34
Main Author Gurlo, Aleksander
Format Book Chapter
LanguageEnglish
Published New York, NY Springer New York 2013
SeriesIntegrated Analytical Systems
Subjects
Charged Atomic Oxygen
Oxygen Adsorption
Oxygen Vacancy
Semiconducting Metal Oxide
Work Function
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Summary:Since the development of the first models of gas detection on metal-oxide-based sensors much effort has been made to describe the mechanism responsible for gas sensing. Despite progress in recent years, a number of key issues remain the subject of controversy; for example, the disagreement between the results of electrophysical and spectroscopic characterization, as well as the lack of proven mechanistic description of surface reactions involved in gas sensing. In the present chapter the basics as well as the main problems and unresolved issues associated with the chemical aspects of gas sensing mechanism in chemiresistors based on semiconducting metal oxides are addressed.
Bibliography:“Sensors have a ‘life cycle’ consisting of preparation, activation, operation with deactivation and, possible, regeneration. Thus understanding the performance in terms of reaction and conductance mechanisms is only a part of the total understanding of a sensor.”Dieter Kohl, Sensorsand Actuators 1989, 18, 71.
ISBN:9781461453949
1461453941
DOI:10.1007/978-1-4614-5395-6_1