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. 2019 Dec 4;9(12):1732. doi: 10.3390/nano9121732

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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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The dynamic response and recovery of the SAW sensor with AlO(OH) film (a) to 10 ppm NH₃ for 4 cycles; (b) to NH₃ of various concentrations in 60 days.