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. 2020 Mar 6;20(5):1432. doi: 10.3390/s20051432

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© 2020 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 (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Calibrations curves and dynamic responses of the L-SAW sensors (based on PPy and Ag/PPy) for acetone (a,b), ethanol (c,d), and toluene (e,f). The insets in (b,d,f) display the time dependent response to 5 ppm of each gas.