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



Downloads per month over past year

Gutiérrez Monreal, Javier and Arés Escolar, Luis and Robla Villalba, José Ignacio and Horrillo Guemes, María Carmen and Sayago Olmo, Isabel and 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

[thumbnail of Agapito-Properties-Polycrystaline.pdf]

Official URL:


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.

Item Type:Article
Additional Information:

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

Uncontrolled Keywords:Gas sensor; Pollution; SnO2
Subjects:Sciences > Physics > Electronics
ID Code:40639
Deposited On:21 Dec 2016 18:32
Last Modified:10 Dec 2018 14:58

Origin of downloads

Repository Staff Only: item control page