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. 2008 Nov 12;8(11):7144–7156. doi: 10.3390/s8117144

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© 2008 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 4. — SWF changes of (a) SnO₂ and (b) In₂O₃ thin films as 18, 1 and 0.4 ppm NO₂ flow was switched on and off. Insets show maximum SWF changes plotted against the concentration of NO₂.