Abstract

The liquid and mechanical exfoliation techniques, used to produce two-dimensional materials (2DM), are merged in a mechanical exfoliation assisted by molecular tweezers technique (MEAMT). Sulfur-based semiconducting materials, that is, WS2 or MoS2 microcrystals dispersed in a liquid, are functionalized with thiolated long chain polymers. The polymer chains bound to the surface of microcrystals are stretched by ultrasonication, which generates a strong mechanical force. The force of the polymer tweezers overcomes the van der Waals force that holds the sheets of the crystals. By changing the chain length of polymer tweezers, the dimensions and the yield percentage of the MoS2 and WS2 sheets produced by MEAMT are controlled. The prepared 2DM functionalized with polymer improve their applicability and stability. Upon comparison to the typical liquid exfoliation technique, the WS2 and MoS2 sheets produced by MEAMT resulted in a higher yield percentage and higher photoluminescence (PL) quantum efficiency. The h...

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