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. 2019 Feb 20;19(4):889. doi: 10.3390/s19040889

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© 2019 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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Response analysis. (a) Real-time response of the sensor to different NH $_{3}$ concentrations, (b) Combination and comparison of response to different NH $_{3}$ concentrations, (c) First and second derivative of response to 60 ppm NH $_{3}$ .