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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/).
(a) The 50× objective optical micrograph of monolayer MoS2; (b) the 100× objective optical micrograph of monolayer MoS2; (c) the FESEM image of triangular monolayer MoS2; and (d) the mapping diagram of monolayer MoS2.