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. 2013 Oct 22;13(10):14214–14247. doi: 10.3390/s131014214

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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 5. — (a) The photo shows one corner of the sensor array. The element has the dimension of 220 × 220 μm² with 20 μm gap between the electrodes. (b) Single transducer element, the sensing material would be deposited to cover A–C. Reprint the photo in [151].