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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 (https://creativecommons.org/licenses/by/4.0/).
(a) MMA base liquid hydrocarbon sensor model; (b) absorption plot of different hydrocarbons; (c) frequency shift of different hydrocarbons; (d) upper-band sensitivity for liquid hydrocarbon sensor model.