English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/85755
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Exportar a otros formatos:


Design of polycrystalline gas sensors based on admittance spectrum measurements

AuthorsGutiérrez, F. J.; Arés, L.; Robla, J. I.; Horrillo, M. C.; Sayago, I.; Agapito, J. A.
Issue Date1992
CitationSensors and Actuators, B: Chemical 7: 609-613 (1992)
AbstractThe electrical properties of grain boundaries are analysed by admittance spectroscopy methods in order to design gas sensors by enhancing the activity of surface states in the detecting operation. A double Schottky barrier explains 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. The admittance of the sample is then modified by these charges. A plot of the real and imaginary components of the admittance versus frequency characteristic gives information about the different parameters that play a role in the conduction mechanisms, i.e., trapping centres, Schottky barriers, etc. The analysis of this plot for several gases (CO and NOx) at different concentrations and temperature allows us to determine the nature of the detection mechanism and the behaviour of the barriers. All these parameters and their influence in the detection of gases are used to design a sensing element suitable for the proper gas atmosphere. These methods have been applied to the design of a CO sensor based on tin oxide films for domestic purposes, the sensitivity of which is presented. © 1992.
Identifiersdoi: 10.1016/0925-4005(92)80373-6
issn: 0925-4005
Appears in Collections:(CENIM) Artículos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf15,38 kBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.