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. 2014 Aug 27;14(9):15849–15860. doi: 10.3390/s140915849

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© 2014 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. — (a) Responses of pristine and Pd-functionalized TiO₂ nanotubes to ethanol or acetone gas as a function of the ethanol or acetone concentration; (b) Responses of pristine and Pd-functionalized TiO₂ nanotubes to ethanol or acetone gas as a function of temperature.