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Journal of Nanomaterials
Volume 2009 (2009), Article ID 316035, 3 pages
http://dx.doi.org/10.1155/2009/316035
Research Article

Sensing of Ethanol with Nanosize Fe-ZnO Thin Films

1Department of Environmental Engineering, National Cheng Kung University, Tainan City 70101, Taiwan
2Sustainable Environment Research Center, National Cheng Kung University, Tainan City 70101, Taiwan
3Department of Bioengineering, University of Washington, Seattle, WA 98105, USA
4Department of Safety, Health and Environmental Engineering, National Kaohsiung First University of Science and Technology, Kaohsiung City 81184, Taiwan
5Department of Chemistry, National Cheng Kung University, Tainan City 70101, Taiwan

Received 7 October 2008; Accepted 24 February 2009

Academic Editor: Alan K. T. Lau

Copyright © 2009 G.-H. Kuo 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.

Abstract

Sensing of ethanol with iron doped ZnO (Fe-ZnO) thin films has been studied in this work. By X-ray diffraction spectroscopy, it is found that ZnO is the main compound in the low-iron (<10%) doped ZnO thin films. is also found as 20–50% of iron are doped on the thin films. The 5% Fe-ZnO thin film has a very high sensitivity ( ) to 1000 ppm of ethanol at 300 K. It seems that iron can promote the sensivity of the ZnO thin film. The thin film doped with a greater amount (20–50%) of iron has, however, a much less sensitivity (<15) to ethanol. The chemical interactions between oxygen of ethanol and zinc on the Fe-ZnO thin film cause changes of the bond distances of Zn–O and Fe–O in the thin films to 1.90 and 1.98 Å which can be restored to 1.91 and 1.97 Å, respectively, in the absence of ethanol.