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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 change of the WS₂/GA sensor to cyclic exposure to NO₂, at different RH values; Panel (b): NO₂ response of the device at different RH values; Panel (c): electrical response of the WS₂/GA device to different concentrations of NO₂ at RH = 60%; Panel (d): calibration curve of the device exposed to NO₂ at RH = 60%. Inset: sketch of the resistive WS2/GA device. (Adapted and reprinted from [196], with permission from Elsevier, Amsterdam, The Netherlands).