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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/).
Average sensor responses of the six “grain boundary-response type” and two “bulk-response type” sensors to 1 ppm of target gases in (a) pure dry air and (b) pure humid air.