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. 2010 Sep 2;10(9):8275–8290. doi: 10.3390/s100908275

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© 2010 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 8. — Responses of a nanowire ZnO₂/MnO₂ composite film based QCM sensor to a predefined concentration of 0.54 ppm DMMP in nitrogen gas during 10 days.