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. 2018 Oct 26;18(11):3638. doi: 10.3390/s18113638

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© 2018 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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Panel (a): resistance variation of BP, MoS₂ and graphene sensors exposed to 0.1, 1, 5, 10 and 50 ppm of NO₂; Panel (b): the maximal resistance change onto various analytes of BP, MoS₂ and graphene sensors. (Adapted and reprinted from [213], with permission from Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, Germany).