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. 2013 Sep 17;13(9):12467–12481. doi: 10.3390/s130912467

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© 2013 by the authors; licensee MDPI, 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 3. — Response of the sensor element using WO₃ powder during exposure to NO (0, 0.5, 1, and 5 ppm) in air at (a) 100 °C and (b) 200 °C. The inset shows the relationship between the sensor response and NO concentration.