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. 2015 Sep 3;5:13706. doi: 10.1038/srep13706

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(a) Monolayer of MoS₂ is made of a honeycomb sheet of Molybdenum atoms covalently sandwiched between two honeycomb sheets of Sulphur atoms. Bulk of MoS₂ is formed by monolayers stacked and held on top of each other by van der Waals forces. Side view of mono-, bi-, tri- and quadlayer is illustrated in parts (b–e), respectively.