Size-Selected SnO<sub>1.8</sub>: Ag Mixed Nanoparticle Films for Ethanol, CO, and CH<sub>4</sub> Detection

Joshi, Rakesh Kumar; Kruis, Frank Einar

doi:https://doi.org/10.1155/2007/67072

Journal of Nanomaterials

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Surface Nanoscience

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Research Article | Open Access

Volume 2007 | Article ID 067072 | https://doi.org/10.1155/2007/67072

Size-Selected SnO_1.8: Ag Mixed Nanoparticle Films for Ethanol, CO, and CH₄ Detection

Rakesh Kumar Joshi^1,2and Frank Einar Kruis¹

Academic Editor: Masamichi Yoshimura

Received21 Dec 2006

Accepted28 Feb 2007

Published12 Apr 2007

Abstract

Mixed nanoparticle films of SnO_1.8: 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 SnO_1.8 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 SnO_1.8: 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 SnO_1.8: 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.

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Copyright

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.

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