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Journal of Nanomaterials
Volume 2007, Article ID 67072, 5 pages
http://dx.doi.org/10.1155/2007/67072
Research Article

Size-Selected SnO1.8: Ag Mixed Nanoparticle Films for Ethanol, CO, and CH4 Detection

1Institute of Nanostructures and Technology, Faculty of Engineering Sciences, Campus Duisburg, University Duisburg-Essen, Bismarck str.81, Duisburg 47057, Germany
2Toyota Technological Institute Nagoya, Japan

Received 21 December 2006; Accepted 28 February 2007

Academic Editor: Masamichi Yoshimura

Copyright © 2007 Rakesh Kumar Joshi and Frank Einar Kruis. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Mixed nanoparticle films of SnO1.8: Ag prepared by the gas phase condensation method using an aerosol route have been used for the detection of CO and CH4. Particle size as estimated by transmission electron microscopy is 20 nm for both SnO1.8 and Ag nanoparticles. The gas-sensing behavior of the films for these gases has been studied in detail as a function of Ag concentration in the films. A study has been made in order to distinguish the size effect and specific surface area effect in the ethanol gas-sensing behavior of SnO1.8: Ag mixed nanoparticle films. This distinction, which has not been possible using the traditional methods of the sensor fabrication, gives evidence of the dominance of size effect of the metal dopant over the surface area effect in the gas sensing of the films. The sensors show also an increased sensor signal with increase of Ag concentration in the films for CO and CH4. It is observed from the comparative study of the sensing behavior of SnO1.8: Ag films for CO and CH4 that the sensors are more sensitive towards CO as compared to CH4. The mixed nanoparticle films were also used for the detection of CO at 100 ppm level.