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Properties of polycrystalline gas sensors based on d.c. and a.c. electrical measurements

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Gutiérrez Monreal, Javier y Arés Escolar, Luis y Robla Villalba, José Ignacio y Horrillo Guemes, María Carmen y Sayago Olmo, Isabel y Agapito Serrano, Juan Andrés (1992) Properties of polycrystalline gas sensors based on d.c. and a.c. electrical measurements. Sensors and actuators B: Chemical, 8 (3). pp. 231-235. ISSN 0925-4005

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URL Oficial: http://dx.doi.org/10.1016/0925-4005(92)85023-P


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Resumen

Electrical properties of polycrystalline gas sensors are analyzed by d.c. and a.c. measurements. d.c. electrical conductivity values compared with those obtained by admittance spectroscopy methods help to obtain a detailed 'on line' analysis of conductivity-modulated gas sensors. The electrical behaviour of grain boundaries is obtained and a new design of sensors can be achieved by enhancing the activity of surface states in the detecting operation. A Schottky barrier model is used to explain the grain boundary action under the presence of surrounding gases. The height of this barrier is a function of gas concentration due to the trapping of excess charge generated by gas adsorption at the interface. A comparison between this dependence, and a plot of the real and imaginary components of the admittance versus frequency at different gas concentrations, provides information on the different parameters that play a role in the conduction mechanisms. These methods have been applied to the design of a CO sensor based on tin oxide films for domestic purposes, the characteristics of which are presented.


Tipo de documento:Artículo
Información Adicional:

Copyright © 1992 Published by Elsevier B.V.
Symposium B: New Materials, Physics & Technologies for Micronic Integrated Sensors
The authors will like to thank COPRECI (FAGOR S. Cop.) Mondragón (Spain) for the finantial support in this research

Palabras clave:Gas sensor; Pollution; SnO2
Materias:Ciencias > Física > Electrónica
Código ID:40639
Depositado:21 Dic 2016 18:32
Última Modificación:10 Dic 2018 14:58

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