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Propane Gas Sensing Properties of SnO2 and SnO2:Ag Thin Films Prepared by Sol-Gel Technique

Published online by Cambridge University Press:  01 February 2011

S. Tirado Guerra
S. Tirado Guerra*
Affiliation:
Escuela Superior de Física y Matemáticas del Instituto Politécnico Nacional, Apdo. Postal 75–544, México, D. F. 07300, México. Tel: + 52 55 5729 6000 55015; Fax: + 52 55 5729 6000 55015. E-mail: tirado@esfm.ipn.mx; salvador_tig@yahoo.com.mx
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Abstract

Both SnO2 and SnO2:Ag thin films were fabricated by the sol-gel process and dip-coating technique. SnCl4•5H2O was used as a precursor of tin to prepare a 0.2M solution with 2-methoxyethanol and monoethanolamine as solvents. From AgNO3 a 0.012M solution in ethanol was prepared, from where the Ag was used as catalyst, which was incorporated superficially to SnO2 film grown on soda-lime substrate. Two series of samples (A and B) about 150 and 300 nm in thickness were prepared and studied. Several layers of Ag as catalyst on the surface of SnO2 films were applied. The films were characterized in structure (RXD), morphology (SEM and AFM) and EDX, electrical and optical properties (UV-vis). The sensing properties of films to the propane at, 0, 1, 5, 50, 100, 200, 300, 400 and 500 ppm gas concentrations were tested in sensors operating at 23, 100, 200 and 300°C. Results for a selection of sensors are presented in this paper.

Keywords

SnoxideAgsensorssol-gel
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1275: Structural and Chemical Characterization of Metals, Alloys and Compounds , 2010 , S3-68
Copyright
Copyright © Materials Research Society 2010

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