RT Journal Article
T1 Properties of polycrystalline gas sensors based on d.c. and a.c. electrical measurements
A1 Gutiérrez Monreal, Javier
A1 Arés Escolar, Luis
A1 Robla Villalba, José Ignacio
A1 Horrillo Guemes, María Carmen
A1 Sayago Olmo, Isabel
A1 Agapito Serrano, Juan Andrés
AB 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.
SN 0925-4005
YR 1992
FD 1992
LK https://hdl.handle.net/20.500.14352/60074
UL https://hdl.handle.net/20.500.14352/60074
LA eng
NO Copyright © 1992 Published by Elsevier B.V.Symposium B: New Materials, Physics & Technologies for Micronic Integrated  SensorsThe authors will like to thank COPRECI (FAGOR S. Cop.) Mondragón (Spain) for the finantial support in this research
DS Docta Complutense
RD 17 abr 2025