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Journal of Nanomaterials
Volume 2007, Article ID 28031, 5 pages
Research Article

Effect of Silver Addition on the Ethanol-Sensing Properties of Indium Oxide Nanoparticle Layers: Optical Absorption Study

1Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
2Institute of Nanostructures and Technology, Faculty of Engineering Sciences, Campus Duisburg, University Duisburg-Essen, Bismarckstr. 81, Duisburg 47057, Germany

Received 21 December 2006; Accepted 11 March 2007

Academic Editor: Masamichi Yoshimura

Copyright © 2007 Vidya Nand Singh et al. 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.


In2O3 and In2O3:Ag nanoparticle layers have been deposited using a two-step method consisting of chemical capping and dip coating techniques. The result of optical absorption analysis of In2O3:Ag samples shows the presence of Ag2O and Ag in air-annealed and vacuum-annealed samples, respectively. These results have been correlated with the gas sensing properties of these layers towards ethanol and support the proposed mechanism that increase in sensor response on Ag addition is due to the conversion of Ag2O to Ag in the presence of ethanol.